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Morphological and molecular identification of Phytophthora tropicalis causing black pod rot of Theobroma cacao cultivated in Tabasco, Mexico Can. J. Plant Pathol. (IF 1.236) Pub Date : 2021-01-18 Belén Chávez-Ramírez; Nadia Denisse Rodríguez-Velázquez; Mario Eduardo Chávez-Sánchez; María Soledad Vásquez-Murrieta; Minerva Aurora Hernández-Gallegos; José Rodolfo Velázquez-Martínez; Carlos Hugo Avendaño-Arrazate; PAULINA Estrada-de los Santos
Abstract Theobroma cacao L. is cultivated in Mexico, primarily in Tabasco, a southern state where the climatic conditions are suitable for producing cacao, the source of chocolate. However, these conditions are also suitable for cacao pathogens such as Phytophthora spp., the causative agents of black pod rot, a disease that is difficult to eradicate once established. In this study, we collected cacao
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Management of Botrytis grey mould caused by Botrytis cinerea in lentil using boscalid fungicide Can. J. Plant Pathol. (IF 1.236) Pub Date : 2021-01-11 Mark E. Kuchuran; Cheryl Armstrong-Cho; Sabine Banniza
Abstract Under cool and wet conditions, high levels of botrytis grey mould (BGM) can occur on lentil in western Canada. Identification of local Botrytis isolates from lentil based on conidial morphology (N = 74) and sequence analysis (N = 5) indicated that B. cinerea was the predominant cause of BGM in this region. Eight field experiments at two sites (Saskatoon, SK and Outlook, SK) over two seasons
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Race Distribution of Pyrenophora tritici-repentis in Relation to Ploidy Level and Susceptibility of Durum and Winter Bread Wheat Can. J. Plant Pathol. (IF 1.236) Pub Date : 2021-01-08 Bohan Wei; Therese Despins; Myriam R. Fernandez; Stephen E. Strelkov; Yuefeng Ruan; Robert Graf; Reem Aboukhaddour
Abstract Tan spot is a destructive disease of wheat caused by the fungus Pyrenophora tritici-repentis (Ptr), with most fungal isolates in Canada known to produce the necrotrophic effector (NE) ToxA. In this study, 144 Ptr isolates collected from durum, winter bread wheat, and grasses in western Canada were evaluated for race classification on a host differential set. The susceptibility of 114 durum
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Effect of fungicide application technology on seed yield in field pea under variable Mycosphaerella blight pressure Can. J. Plant Pathol. (IF 1.236) Pub Date : 2021-01-07 R. Bowness; B.D. Gossen; K.F. Chang; C.J. Willenborg; R.L. Conner; S.E. Strelkov
Abstract Mycosphaerella blight, caused by Peyronellaea pinodes (Berk. & A. Bloxam) Aveskamp, Gruyter & Verkley (syn. Mycosphaerella pinodes (Berk. et Blox.) Vesterg.), is a destructive foliar pathogen of field pea that is managed, in large part, through application of foliar fungicide at flowering. The fungicides are usually applied into dense crop canopies, so reaching the lower areas of the canopy
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Phylogenetic, phenotypic and host range characterization of five Fusarium species isolated from chickpea in Alberta, Canada Can. J. Plant Pathol. (IF 1.236) Pub Date : 2021-01-05 Qixing Zhou; Yalong Yang; Yingli Wang; Chris Jones; David Feindel; Michael Harding; Jie Feng
Abstract Chickpea (Cicer arietinum L.) is an important food legume worldwide, providing a source of high quality protein. Fifteen chickpea samples showing leaf yellowing and root rot were obtained from southern Alberta, Canada, in 2018. Twenty single-spore Fusarium isolates were obtained from those samples. Based on the morphological characteristics, five species of Fusarium were identified, with F
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First report of Verticillium isaacii causing wilting and vascular blackening on wasabi (Wasabia japonica) plants Can. J. Plant Pathol. (IF 1.236) Pub Date : 2021-01-04 E.C. Betz; Z.K. Punja
Abstract Wasabi (Wasabia japonica (Miq.) Matsum) plants are grown over a period of 12-18 months for their valuable rhizomes, and pathogens infecting the rhizome are of economic importance for producers. During 2016 and 2017, symptoms of wilting and internal vascular blackening of rhizomes were observed in two greenhouses in British Columbia, with disease incidence in the range of 5-10%. Isolates recovered
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The Fusarium solani species complex infecting cannabis (Cannabis sativa L., marijuana) plants and a first report of Fusarium (Cylindrocarpon) lichenicola causing root and crown rot Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-12-23 Zamir K. Punja; Li Ni; Alastair Roberts
Abstract Greenhouse-grown cannabis (Cannabis sativa L., marijuana) plants with yellowing, crown rot and root browning symptoms were sampled from six production facilities during 2019-2020. Among 34 fungal isolates recovered, 28 were identified as Fusarium solani and six isolates were provisionally identified as Cylindrocarpon sp. based on morphology. These latter isolates produced slow-growing colonies
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Winter cover crops as reservoirs of tobacco rattle virus (TRV) and hosts of root-lesion, root knot and stubby-root nematodes Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-12-21 Janice F. Elmhirst; Thomas A. Forge
Abstract A greenhouse pot study was conducted on four cover crops (annual ryegrass, perennial tetraploid ryegrass, winter wheat cv. ‘Caledonia’ and sorghum-sudangrass) and one rotation crop (sweet corn cv. ‘Sheba’) to compare the efficiency of these crop species as hosts of Paratrichodorus minor (Colbran) Siddiqi, and the ability of the nematodes to acquire tobacco rattle virus (TRV) from roots of
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Morphological and molecular identification and pathogenicity of Alternaria spp. associated with ginseng in Jilin province, China Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-12-18 Jie Gao; Ming J. Yang; Zhao Xie; Bao H. Lu; Tom Hsiang; Li P. Liu
Abstract Alternaria panax (sect. Panax) is reported to be the main causal agent of alternaria blight on ginseng (Panax ginseng) in Asia. However, the species distribution causing ginseng alternaria blight in China has not been examined since 1964. Two hundred fifty-seven Alternaria isolates were obtained from 2015–2019 from 13 ginseng-producing areas in Jilin province, China. Based on morphological
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Biological and molecular characterization of tomato spotted wilt virus (TSWV) infecting Chrysanthemum in India Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-12-18 Chinnaiah Senthilraja; Varagur Ganesan Malathi; Sevugapperumal Nakkeeran; Mariappan Suganthy; Uthandi Sivakumar; Perumal Renukadevi
Abstract Tomato spotted wilt virus (TSWV) infecting chrysanthemum (Dendranthema grandiflora L.) has been identified as a major constraint for chrysanthemum cut-flower industries in Southern India. The disease symptoms include veinal necrosis, necrotic spots on leaves, deformed flowers, and stem necrosis. The presence of TSWV in chrysanthemum plants collected from farms at Kotagiri, Nedugula, and Yercaud
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Dissimilarity analysis of microbial communities in the rhizosphere and tissues of diseased and healthy cherry trees (Cerasus pseudocerasus) Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-12-16 Li Ding; Lijuan Xu; Xi Chu; Lu Yang; Hongli Zhu; Jianxin Huang
Abstract Cherry trees (Cerasus pseudocerasus (Lindl.) Loudon) in Bai Lu Yuan, Shaanxi Province, China, are susceptible to a serious disease that causes substantial economic losses. The pathogens causing this disease, designated black spot disease, are currently unknown. To identify the relationship between microbial community structure and the status of plant health, we obtained samples from the rhizosphere
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Real-time and visual detection of Cercospora canescens based on the cytb gene using loop-mediated isothermal amplification (LAMP) Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-12-09 Zhen Liu; Xinchun Zhang; Di Chen; Jumei Hou; Tong Liu
Abstract Cercospora canescens Ellis & Martin is an important fungal pathogen that causes leaf spot and defoliation in mungbean (Vigna radiata (Linn.) Wilczek.). Molecular methods for detection of this pathogen have not yet been developed. In this study, we developed a real-time and visual loop-mediated isothermal amplification (LAMP) assay based on the cytochrome b (cytb) gene to detect C. canescens
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Building on a foundation: advances in epidemiology, resistance breeding, and forecasting research for reducing the impact of fusarium head blight in wheat and barley Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-12-09 W.G. Dilantha Fernando; Abbot O. Oghenekaro; James R. Tucker; Ana Badea
Abstract Fusarium head blight (FHB) is a major fungal disease that contributes to severe economic losses for wheat and barley production in Canada and other parts of the world. Rapid developments in molecular biology over the past three decades have improved the ability to devise predictive management tools to combat the effects of the disease. Important aspects of Fusarium species in terms of the
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Evaluation of disease management approaches for powdery mildew on Cannabis sativa L. (marijuana) plants Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-12-03 Cameron Scott; Zamir K. Punja
Abstract Powdery mildew on cannabis (Cannabis sativa L., marijuana), caused by Golovinomyces cichoracearum, reduces plant growth and overall quality. To investigate disease management options, biological, chemical and physical approaches were assessed. A mildew-susceptible strain, ‘Copenhagen Kush’, was grown indoors with continual exposure to mildew inoculum. Treatments were applied weekly over a
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Pathotypes of Plasmodiophora brassicae collected from clubroot resistant canola (Brassica napus L.) cultivars in western Canada in 2017-2018 Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-12-02 K.B. Hollman; S.F. Hwang; V.P. Manolii; S.E. Strelkov
Abstract Clubroot, caused by Plasmodiophora brassicae Woronin, is an important soilborne disease of canola (oilseed rape; Brassica napus L.). In Canada, clubroot management relies heavily on the planting of resistant cultivars, but since 2013, resistance has been broken in an increasing number of fields. Prior to the introduction of resistance, P. brassicae pathotype 3H, as defined on the Canadian
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Correction Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-12-02
(2020). Correction. Canadian Journal of Plant Pathology. Ahead of Print.
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Detection and quantification of airborne spores from six important wheat fungal pathogens in southern Alberta Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-11-27 Gabriela T. Araujo; Eric Amundsen; Michele Frick; Denis A. Gaudet; Reem Aboukhaddour; Brent Selinger; James Thomas; André Laroche
Abstract Wheat is affected by many fungal diseases that can cause severe yield and quality losses. Disease prediction models generally employ weather data to estimate potential for infection to determine timing for fungicide applications, but these models fail to account for the presence and quantity of pathogen inoculum. This study adapted highly specific qPCR primers to identify and quantify, in
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Distribution and frequency of mating types of Rhynchosporium commune in central Alberta Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-11-20 Michael D. Holtz
Abstract Rhynchosporium commune, the cause of barley scald, is an important disease of barley in Canada. Multiple studies have indicated that cryptic sexual reproduction may occur between opposite mating types (MAT1-1 and MAT1-2). The occurrence of R. commune mating types in Canada has not been determined previously. Infected leaves from barley cultivars in seven commercial fields and three breeding
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Mapping of Ug99 stem rust resistance in Canadian durum wheat Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-11-19 Sachin Kumar; Tom G. Fetch; Ron E. Knox; Asheesh K. Singh; John M. Clarke; Ron M. Depauw; Richard D. Cuthbert; Heather L. Campbell; Davinder Singh; Sridhar Bhavani; Curtis J. Pozniak; Brad Meyer; Fran R. Clarke
Abstract Stem rust, caused by Puccinia graminis f. sp. tritici (Pgt), has potential to cause major yield losses in durum wheat. Development of durum cultivars with improved resistance to stem rust is a sustainable option for effective control of this disease. The present study was conducted to identify genomic regions associated with resistance to Ug99-derived Pgt races using a doubled haploid (DH)
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The race structure of Leptosphaeria maculans in western Canada between 2012 and 2014 and its influence on blackleg of canola Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-11-12 Wali Soomro; Randy Kutcher; Fengqun Yu; Sheau-Fang Hwang; Dilantha Fernando; Stephen E. Strelkov; Gary Peng
Abstract Field surveys indicate blackleg of canola has increased in western Canada since 2010. Earlier studies showed changes in the pathogen (Leptosphaeria maculans (Sowerby) P.Karst.; Lm) population between 2007 and 2010–2011. In this study, Lm isolates were collected from trap plots (591) and/or commercial fields (372) on the prairies between 2012 and 2014, and tested for the profile of avirulence
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Multigene characterization of a ‘Candidatus Phytoplasma australasia’ strain associated with Roystonea regia in Oman Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-11-12 Chamran Hemmati; Ali Masood Al-Subhi; Abdullah Mohammed Al-Sadi
Abstract Florida or Cuban royal palm (Roystonea regia (Kunth) O.F. Cook) is an important ornamental plant with many uses for humans. Royal palm trees grown in Muscat, Oman, were found exhibiting leaf yellowing, leaf decay starting on the mature leaves, and leaf stunting. Trunk tissue samples were collected and analysed with nested and semi-nested PCR assays for the 16S rRNA, translation elongation
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First report of Fusarium sporotrichioides causing root rot of soybean in Canada and detection of the pathogen in host tissues by PCR Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-11-04 Ahmed Abdelmagid; Mohamed Hafez; Atta Soliman; Lorne R. Adam; Fouad Daayf
Abstract Soybean plants showing symptoms of root rot were collected from fields in Manitoba, Canada, in 2017, to determine the causal agent of the disease. Of 240 isolated strains, including some known as root rot pathogens, five were identified as Fusarium sporotrichioides Sherb. based on morphological characteristics. All five isolates were pathogenic when inoculated on soybean under controlled conditions
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Symptoms and distribution of blossom blight in alfalfa seed production on the Canadian Prairies Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-10-30 B. D. Gossen; R. J. Howard
Abstract Surveys of alfalfa (Medicago sativa L.) seed production fields on the Canadian Prairies from 1993 to 2017 demonstrated that epidemics of blossom blight caused by Botrytis cinerea Pers. and Sclerotinia sclerotiorum (Lib.) de Bary developed almost every year at some location(s). Blossom blight symptoms were prominent when epidemics were severe, but more difficult to identify when present at
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Overwinter survival and alternative crop hosts of fungi and oomycetes present in field pea residue on the Canadian prairies Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-10-30 Ahmad Esmaeili Taheri; Bruce D. Gossen; Debra L. Mclaren; Syama Chatterton
Abstract Root rot is an important disease of field pea (Pisum sativum L.) on the Canadian Prairies. The composition and alternative crop hosts of fungal and oomycete communities colonizing pea residues from Alberta and Manitoba were studied in field trials over two years. Standing pea residues were sampled from diseased and asymptomatic patches of 17 commercial fields in 2013 and 2014 after harvest
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First report of stem blight and leaf spot in horse purslane caused by Gibbago trianthemae in Sinaloa, Mexico Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-10-28 Rubén Félix-Gastélum; Ana B. Valdez-Leyva; Rosario A. Fierro-Coronado; Ignacio E. Maldonado-Mendoza
Abstract Horse purslane (Trianthema portulacastrum L.) is a common weed in Mexico, where it competes with different agricultural crops and grows along watercourses, railways and roadsides, abandoned fields, and urban communities. In Sinaloa, this weed grows abundantly during the rainy season (July–September) and competes with summer crops such as corn and sorghum during the fall-winter season, and
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DNA-barcoding identification of Dothistroma septosporum on Pinus contorta var. latifolia, P. banksiana and their hybrid in northern Alberta, Canada Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-10-28 Nicolas Feau; Tod D. Ramsfield; Colin L. Myrholm; Bradley Tomm; Herb F. Cerezke; Andy Benowicz; Erica Samis; Ashley Romano; Angela L. Dale; Arnaud Capron; Renate Heinzelmann; Richard C. Hamelin
Abstract The ascomycete fungi Dothistroma septosporum (Dorogin) M. Morelet and D. pini Hulbary are both responsible for Dothistroma needle blight disease (DNB) on pines. Using a DNA-barcoding approach, we confirmed that the DNB infection of lodgepole pine (Pinus contorta Dougl. var. latifolia Engelm.), jack pine (P. banksiana Lamb.) and their hybrid in four research sites in northern Alberta (Canada)
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Races of Puccinia graminis on barley, oat, and wheat in Canada from 2015 to 2019 Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-10-27 T. Fetch; J. Mitchell Fetch; T. Zegeye; A. Xue
Abstract Stem rust is a major disease on barley, oat, and wheat crops worldwide. The primary means of control is by host resistance genes that are incorporated into commercial varieties and have been effective against most races of Puccinia graminis Pers., the causal pathogen. Since this pathogen continually mutates, analyzing the population virulence structure is crucial to detect new races with increased
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Early fungicide treatment reduces blackleg on canola but yield benefit is realized only on susceptible cultivars under high disease pressure Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-10-23 Gary Peng; Chang Liu; Dilantha W.G. Fernando; Ralph Lang; Debra L. Mclaren; Eric N. Johnson; H. Randy Kutcher; Gursahib Singh; T. Kelly Turkington; Fengqun Yu
Abstract Blackleg [Leptosphaeria maculans (Desm.) Ces. & de Not.] is the most widespread disease of canola (Brassica napus L.) on the Canadian prairies. It has a noticeably increased incidence in recent years possibly due to shifts in the pathogen population and erosion in cultivar resistance. This study was conducted to assess foliar-applied fungicides for mitigating the risk of blackleg. Field trials
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Inheritance of resistance to the newly identified Plasmodiophora brassicae pathotypes in Brassica napus L. Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-10-23 Rubeena Shaikh; Mehdi Farid; Habibur Rahman
Abstract Clubroot disease caused by Plasmodiophora brassicae Woronin is one of the most devastating diseases of canola (Brassica napus L.). Pathotype 3H has been the most prevalent and virulent pathotype in western Canada. Many resistant cultivars have been developed in Canada in recent years. However, large-scale cultivation of these cultivars resulted in the identification of several new virulent
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Molecular characterization of group 16SrI and 16SrIII phytoplasmas associated with loofah witches’ broom disease in Sinaloa, Mexico Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-09-22 María Elena Santos-Cervantes; Jesús Enrique Camacho-Bojórquez; Ulises Rosario Escobedo-Rivera; Jesús Méndez-Lozano; Norma Elena Leyva-López
Loofah [Luffa acutangula (L.) Roxb.] is grown in some regions of Asia, Africa and the Americas. This vegetable is well known for its high nutritional and medicinal value. Loofah plants showing typical symptoms of phytoplasma infection, such as witches’ broom, fruit deformation, flower proliferation and phyllody were observed in a commercial field in Sinaloa, Mexico, in January 2015. Nineteen symptomatic
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Changes in the range and virulence of Plasmodiophora brassicae across Canada Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-09-16 M.R. Mcdonald; F. Al-Daoud; A. Sedaghatkish; M. Moran; T.J. Cranmer; B.D. Gossen
Plasmodiophora brassicae causes clubroot on Brassica vegetables and canola around the world. A diverse assemblage of new pathotypes have been identified on canola in the Canadian province of Alberta since 2012, but the pathotypes present in the rest of Canada have not been assessed in detail in recent years. Brassica vegetable and canola fields in Ontario were surveyed for clubroot in 2017–2019. The
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First report of wasabi mottle virus causing ringspot and vein-clearing symptoms on wasabi (Wasabia japonica) in North America Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-09-11 Jesse L. MacDonald; Zamir K. Punja; Yu Xiang; Michael J. Bouthillier; Ron Reade; Robyn M. DeYoung; Basdeo Bhagwat; Emily C. Betz; Ying Q. Li; Xiaoban Chen
Symptoms of ringspots and vein-clearing were observed on wasabi (Wasabia japonica (Miq) Matsum) plants in three greenhouses in British Columbia during 2017. Ten indicator plant species, including four Nicotiana species, were inoculated with sap extracts from symptomatic leaves; after 4–11 days, necrotic lesions developed on all plants. Transmission electron microscopy revealed rod-shaped virions, 250–300 nm
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Trichoderma spp. and a carob (Ceratonia siliqua) galactomannan to control the root-knot nematode Meloidogyne incognita on tomato plants Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-09-09 Giada D’Errico; Pasquale Mormile; Mario Malinconico; Sergio Bolletti Censi; Stefania Lanzuise; Antonio Crasto; Sheridan L. Woo; Roberta Marra; Matteo Lorito; Francesco Vinale
Restrictions about the use of chemicals have limited the availability of control measures against plant-parasitic nematodes. The search for more sustainable approaches has focused the attention on biological control agents, such as Trichoderma species. In recent years, there has been a growing interest in the use of biopolymers for a wide range of applications. These polysaccharide-based compounds
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Characterization of Pestalotiopsis chamaeropis causing gray blight disease on tea leaves (Camellia sinensis) in Chongqing, China Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-09-09 Yingjuan Chen; Yuhe Wan; Liang Zeng; Qing Meng; Lianyu Yuan; Huarong Tong
Gray blight, caused by Pestalotiopsis-like species, is one of the most serious diseases in tea [Camellia sinensis (L.) O. Kuntze] production. In this study, eight Pestalotiopsis isolates obtained from diseased tea leaves collected in Chongqing, China were identified as P. chamaeropis Maharachch, K.D. Hyde & Crous. Pestalotiopsis chamaeropis as a causal agent of tea gray blight disease was clearly distinguished
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Alberta Regional Meeting, 2019 / Réunion régionale de l’Alberta, 2019 Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-07-03
(2020). Alberta Regional Meeting, 2019 / Réunion régionale de l’Alberta, 2019. Canadian Journal of Plant Pathology: Vol. 42, No. 3, pp. 445-452.
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Atlantic regional meeting, 2019/Réunion régionale de l'Atlantique, 2019 Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-07-02
(2020). Atlantic regional meeting, 2019/Réunion régionale de l'Atlantique, 2019. Canadian Journal of Plant Pathology: Vol. 42, No. 3, pp. 453-457.
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Southwestern Ontario regional meeting, 2019/Réunion régionale sud-ouest de l’Ontario, 2019 Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-07-15
(2020). Southwestern Ontario regional meeting, 2019/Réunion régionale sud-ouest de l’Ontario, 2019. Canadian Journal of Plant Pathology: Vol. 42, No. 3, pp. 465-467.
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Fungicide efficacy and timing for the management of Stemphylium vesicarium on onion Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-08-28 Sara M. Stricker; Cyril S. Tayviah; Bruce D. Gossen; Mary Ruth Mcdonald
Stemphylium leaf blight (SLB), caused by Stemphylium vesicarium (Wallr.) E.G. Simmons, has become an important disease of onion (Allium cepa L.) in Ontario, Canada, and the northeastern USA in recent years. The disease presents as elongated lesions on the leaves and severe leaf dieback. The effect on yield is unclear, but the extensive leaf dieback limits uptake of sprout inhibitors that are applied
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Botrytis cinerea management in ornamental production: a continuous battle Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-08-27 Ravi Bika; Fulya Baysal-Gurel; Christina Jennings
Ornamental production systems are complicated to manage due to the many species and genera that may be grown and handled together on a single production site. Ornamentals are threatened by various phytopathogenic fungi in greenhouse and field production. Among these, Botrytis cinerea is one of the most notorious pathogens of ornamentals, specifically cut flowers. B. cinerea is responsible for causing
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Occurrence and characterization of Ustilago cynodontis (Passerini) Henn., the causal agent of Bermudagrass (Cynodon dactylon) smut in Egypt Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-08-12 Hammad Abdelwanees Ketta; Amero Ali Emeran
Smutted Bermudagrass (Cynodon dactylon L.) plants with diseased spikelets and completely deformed inflorescences covered with black teliospores were collected from five locations at the borders of plantations in Kafr El-Sheikh province, Egypt, in April 2018. The fungus was isolated from infected plants and identified as Ustilago cynodontis (Passerini) Henn. based on its cultural and morphological characteristics
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Application of genomics and transcriptomics to accelerate development of clubroot resistant canola Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-08-12 Qinqin Zhou; Leonardo Galindo-González; Sheau-Fang Hwang; Stephen E. Strelkov
Clubroot, a soil-borne disease caused by the obligate parasite Plasmodiophora brassicae Woronin, is a threat to canola (Brassica napus L.) production in western Canada. Genetic resistance represents the most effective tool to manage this disease. However, given the rapid spread of clubroot and the emergence of new virulent pathotypes of P. brassicae, it is important to accelerate the resistance breeding
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First report of triticale blast caused by the fungus Magnaporthe oryzae pathotype Triticum in Bangladesh Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-08-07 Krishna Kanta Roy; Muzahid-E-Rahman; Mostofa Ali Reza; Kishowar E Mustarin; Paritosh Kumar Malaker; Naresh Chandra Deb Barma; Israil Hossain; Xinyao He; Pawan Kumar Singh
Symptoms of partially bleached and completely white heads were observed in a triticale (× Triticosecale) cultivar ‘BARI Triticale 1ʹ in the research plots at the Regional Agricultural Research Station, Jashore, Bangladesh, during April 2019. Foliar symptoms with elliptical or eye-shaped lesions were also found on plant leaves. The main intention of this study was to isolate and identify the causal
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First report of Fusarium proliferatum causing crown and stem rot, and pith necrosis, in cannabis (Cannabis sativa L., marijuana) plants Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-08-06 Zamir K. Punja
Abstract Cannabis (Cannabis sativa L., marijuana) plants grown under greenhouse or controlled environments with symptoms of leaf yellowing, leaf necrosis and defoliation were observed during 2018–2019. Additional symptoms included crown rot and internal browning or blackening of the pith tissues. Stock (mother) plants as well as plants in the vegetative and flowering stages of 15 cannabis strains (genotypes)
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Structure and diversity of Fusarium communities inhabiting non-cultivated grass inflorescences in New York State Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-08-05 Michael R. Fulcher; Eniola D. Oladipo; James B. Winans; Menchus Quan; Gary C. Bergstrom
The structure and diversity of wild grass spike-inhabiting Fusarium communities are not well understood. Fifteen common, non-cultivated grasses were surveyed across two years, regions, and land uses for spike-dwelling Fusarium spp. Eleven fungal species were identified from 857 isolates, including two, F. camptoceras and F. lactis, not recorded previously in New York state or on grass hosts. Species
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Epidemiology of Fusarium oxysporum causing root and crown rot of cannabis (Cannabis sativa L., marijuana) plants in commercial greenhouse production Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-08-04 Zamir K. Punja
Abstract Fusarium oxysporum causes root browning and crown infection on marijuana (Cannabis sativa L.) plants, resulting in stunted growth, yellowing of leaves, and plant death. Pathogen presence and diversity were assessed in samples of diseased crowns, stems, pith tissues and roots from five commercial production facilities in British Columbia and Ontario. PCR of the elongation factor (EF-1 α) region
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Evaluating the effect of tuf and secA gene sequence length for discrimination of phytoplasmas Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-07-31 Ali M. Al-Subhi; Saskia Hogenhout; Rashid Abdullah Al-Yahyai; Aisha Gharib Al-Ghaithi; Abdullah Mohammed Al-Sadi
Phytoplasmas are a major liming factor to the growth and production of many plant species worldwide. Most studies have used the conserved 16S rRNA gene for phytoplasma identification and classification. The efficiency of the tuf and secA genes length in the characterization of phytoplasmas was evaluated by designing universal primers to amplify the long and short tuf (740 bp and 414 bp) and secA (1232
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Field evaluation for rhizomania resistance of transgenic sugar beet events based on gene silencing Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-07-30 Shahed Safar; Mohsen Bazrafshan; Maryam Khoshnami; Ali Asghar Behrooz; Farideh Hedayati; Mojdeh Maleki; Seyed Bagher Mahmoudi; Mohammad Ali Malboobi
Rhizomania is one of the most damaging and widespread diseases in the major sugar beet (Beta vulgaris L. subsp. vulgaris) growing regions worldwide. The causal agent, Beet necrotic yellow vein virus, is transmitted by a plasmodiophorid vector, Polymyxa betae Keskin. In this study, the inhibition of BNYVV multiplication was evaluated, under field conditions, in six sugar beet transgenic events generated
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Characterisation of Fusarium species infecting tomato in Mwea West Sub-county, Kirinyaga County, Kenya Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-07-23 M. W. Mwangi; W. M. Muiru; J. W. Kimenju
Fusarium species cause various diseases of tomato, the most common being vascular wilt and cortical rots. A study was carried out to characterize Fusarium spp. found in the stems of wilted tomato plants from farms in Mwea West Sub-county, Kirinyaga County, Kenya. Isolates were collected from tomato stems showing vascular discolouration. One hundred and one isolates of Fusarium spp. were obtained and
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Induction of resistance to Meloidogyne graminicola in rice Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-07-20 Mayra Renata Cruz Soares; Cláudia Regina Dias-Arieira
Root-knot nematodes are responsible for substantial losses in rice production. These parasites are difficult to control, particularly in flooded fields, which require carefully designed strategies to avoid contamination of water bodies. This study investigated whether biotic and abiotic elicitors can induce resistance to the root-knot nematode Meloidogyne graminicola in rice plants. An initial screening
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Transcriptome analysis of two lines of Brassica oleracea in response to early infection with Xanthomonas campestris pv. campestris Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-07-20 Qingguo Sun; Enhui Zhang; Yaping Liu; Zhongmin Xu; Maixia Hui; Xinxin Zhang; Meijie Cai
Black rot, caused by Xanthomonas campestris pv. campestris (Pammel) Dowson (Xcc), is a devastating disease of cruciferous crops worldwide and a threat to the economic production of Brassica oleracea L. in China. Strategies to control this disease are limited. In addition, knowledge of the molecular mechanisms of pathogenicity and host resistance are still only poorly understood. In this study, we performed
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Fusarium head blight resistance in F1 hybrid spring wheat Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-07-17 Justin Leier; Sintayehu Daba; Andrew Friskop; Blaine Johnson; Jack Rasmussen; Senay Simsek; Andrew Green
Hybrid wheat shows promise to increase yield potential, but many questions remain about the hybrid system. One of the most important is how hybrids will perform in terms of diseases such as Fusarium head blight (FHB). It is unknown if a hybrid produced from a resistant by susceptible cross will express acceptable resistance levels. This experiment tested hybrids produced from four resistant parents
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Systemic colonization of potato plants resulting from potato haulm inoculation with Dickeya solani or Pectobacterium parmentieri Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-07-17 P. Kastelein; M.G. Förch; M.C. Krijger; P.S. van der Zouwen; W. van den Berg; J.M. van der Wolf
Abstract In two glasshouse experiments, colonization of potato (Solanum tuberosum L.) plants by the bacterial pathogens Dickeya solani and Pectobacterium parmentieri was studied after leaf infection. Leaves, whether or not artificially wounded, were spray-inoculated with various densities of green-fluorescent protein tagged strains of the pathogens, avoiding contamination of soil during inoculation
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Management of powdery mildew, caused by Erysiphe cruciferarum, on wasabi (Wasabia japonica) plants in British Columbia Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-07-10 E.C. Betz; Z.K. Punja
Powdery mildew on wasabi (Wasabia japonica (Miq.) Matsumura)plants reduces photosynthesis and severe infections can result in chlorosis and defoliation, resulting in reduced yields. Erysiphe cruciferarum Opiz ex L. Junell was confirmed as the causal agent using sequence analysis of the ITS1-5.8 S-ITS2 region, along with conidial and conidiophore morphology. To evaluate reduced-risk management options
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Evaluation of disease severity caused by Bean golden mosaic virus in different bean cultivars Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-07-07 Aline Taiane De Freitas-Vanzo; Camila de Cassia Da Silva; Tanara Garcia De Novaes; Daniel Mazzieri Walz; Francismar Correa Marcelino Guimarães; Marcia Kamogae Kuwahara; Rúbia De Oliveira Molina; Rui Pereira Leite Junior
Common bean (Phaseolus vulgaris L.) can be affected by several viral diseases, including golden mosaic caused by the Bean golden mosaic virus (BGMV). When infected by BGMV, bean plants undergo major physiological changes, leading to a reduction or complete loss of productivity. This study aimed to evaluate and compare seven bean cultivars and lineages, as well as the legume calopo (Calopogonium mucunoides
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Characterization of clubroot (Plasmodiophora brassicae) from canola (Brassica napus) in the Peace Country of Alberta, Canada Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-07-03 Stephen E. Strelkov; Sheau-Fang Hwang; Victor P. Manolii; George Turnbull; Rudolph Fredua-Agyeman; Keisha Hollman; Sheila Kaus
Clubroot of canola (Brassica napus L.), caused by Plasmodiophora brassicae Woronin, has spread to more than 3000 fields in Alberta, Canada, since it was first identified in 2003, but the disease had not been reported in the Peace Country Region in the northwest of the province. In 2017, 21 cases of clubroot were found in Big Lakes County, the southeastern-most district in this region. In 2018, an additional
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Action of thymol, carvacrol and eugenol on Penicillium and Geotrichum isolates resistant to commercial fungicides and causing postharvest citrus decay Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-06-26 Hakima Moussa; Bouchra El Omari; Hanane Chefchaou; Mariam Tanghort; Aouatef Mzabi; Najat Chami; Adnane Remmal
This study aimed to evaluate the antifungal activity of oregano and clove essential oils and their main components (thymol, carvacrol and eugenol) against Penicillium digitatum, as well as against isolates of Penicillium italicum and Geotrichum candidum resistant to imazalil or guazatine, respectively. In vitro tests were conducted by a direct contact method on potato dextrose agar medium. The results
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The diverse mycoflora present on dried cannabis (Cannabis sativa L., marijuana) inflorescences in commercial production Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-06-16 Zamir K. Punja
Abstract The objective of this study was to assess harvested dried inflorescences (buds) of cannabis (Cannabis sativa L., marijuana) for fungal presence and diversity. Samples from drying rooms of three licenced facilities in British Columbia were tested repeatedly during 2017–2019. A swab method was used, wherein sterile cotton swabs were gently swabbed over bud surfaces and directly streaked onto
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British Columbia regional meeting, 2019 / Réunion régionale de la Colombie-Britannique, 2019 Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-06-16
(2020). British Columbia regional meeting, 2019 / Réunion régionale de la Colombie-Britannique, 2019. Canadian Journal of Plant Pathology: Vol. 42, No. 3, pp. 458-464.
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Characterization of Septoria brown spot disease development and yield effects on soybean in Illinois Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-06-09 Heng-An Lin; María B. Villamil; Santiago X. Mideros
Brown spot, caused by Septoria glycines Hemmi, is a highly prevalent foliar disease of soybean (Glycine max (L.) Merr.). Despite its wide distribution, the development of Septoria brown spot and its relationship with yield reduction remain poorly characterized. In this study, we conducted replicated multi-location inoculated field trials to characterize the disease development and evaluated the relationship
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Effect of temperature on aggressiveness of Plasmopara viticola f. sp. aestivalis and P. viticola f. sp. riparia from eastern Canada Can. J. Plant Pathol. (IF 1.236) Pub Date : 2020-06-09 Romaric A. Mouafo-Tchinda; Carole Beaulieu; Mamadou L. Fall; Odile Carisse
Downy mildew caused by Plasmopara viticola is a devastating disease of grapes. Four formae speciales have been identified in the pathogen, with P. viticola f. sp. aestivalis and P. viticola f. sp. riparia responsible for epidemics in eastern Canada. The objective of this study was to evaluate the effect of temperature on