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Alocasia macrorrhiza Represents a New Host of ‘Candidatus Phytoplasma asteris’-Related Strains Associated with Yellows Symptoms in China Plant Dis. (IF 4.5) Pub Date : 2024-02-14 Shao-Shuai Yu, An-Na Zhu, Wei-Wei Song
Abstract not available
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First Report of Stagonosporopsis pogostemonis Causing Leaf Spot on Cauliflower in Italy Plant Dis. (IF 4.5) Pub Date : 2024-02-12 Wassim Habib, Mariangela Carlucci, Roberto Fasano, Franco Nigro
Abstract not available
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First report of leaf spot disease caused by Alternaria alternata on Polygonatum cyrtonema Hua in Hunan Province of China. Plant Dis. (IF 4.5) Pub Date : 2023-11-30 Q J Fan,QianYa Zhou,Sha Zhang,Ying Li,Jun Li,Xu Chen,Lei Sun
Polygonatum cyrtonema Hua, a perennial plant of the Asparagaceae family, is an important herb in Chinese medicine and is mainly grown in the Chinese provinces of Guizhou, Hunan, Yunnan, Anhui, and Zhejiang (Chen et al. 2021). In June 2021, a new case of leaf spot disease was detected in an 80 m2 plantation of P. cyrtonema on Xuefeng Mountain, Huaihua City, Hunan Province (27°17'30″N, 110°24'20″E).
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First Report of Colletotrichum tropicale Causing Anthracnose on Pitaya (Hylocereus costaricensis) in Brazil. Plant Dis. (IF 4.5) Pub Date : 2023-11-30 Eliane Mayumi Inokuti,Diene Elen Miranda da Silva,Mirla Maria Mesquita Almeida,Jamile Rabêlo Oliveira,Israel Lopes de Andrade,Christiana de Fátima Bruce da Silva,Márcio Cleber de Medeiros Corrêa,Cristiano Souza Lima
Pitaya, Hylocereus costaricensis, is a species of the Cactaceae family and originated in the Americas (Ortiz & Livera, 1995). It has been cultivated in Brazil and has shown a great potential for fruit production and is currently present in several markets (Faleiro et al. 2021). In July 2018, infected plants of pitaya with symptoms of anthracnose were obtained from an orchard in Fortaleza, Ceará Brazil
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First Report of Leaf Spot Caused by Paramyrothecium foliicola on Peanut in China. Plant Dis. (IF 4.5) Pub Date : 2023-11-30 Linkai Cui,Ning Guo,Tingli Liu,Yanhong Hu
Peanut (Arachis hypogaea) is an important economic and oil crop in China. In September 2022, leaf spots were observed on peanut in Luoyang city, Henan province, China (34°49'N, 112°37'E). The disease occurred on about 30% of the peanut leaves in only one 0.5-acre field. Symptoms appeared primarily as brown spots, that varied in shape, and appeared round, oval or irregular. In addition, some disease
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First report of Xanthomonas campestris pv. campestris causing black rot on oilseed rape (Brassica napus L.) in France. Plant Dis. (IF 4.5) Pub Date : 2023-11-30 Sophie Cesbron,Martial Briand,Jessica Dittmer,Lydia Bousset-Vaslin,Marie-Agnès Jacques,Alain Sarniguet
In October 2022, v-shaped necrotic lesions were observed on the leaf margins of field-grown winter oilseed rape (WOSR), Brassica napus L., in western France (Ille-et-Vilaine (35) and Maine-et-Loire (49) departments). Disease incidence on volunteers and cultivated WOSR was generally low (5-10 %) but occasionally up to 80% on some fields. Leaf sections sampled from the margin of necrotic leaf tissue
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First Report of Colletotrichum gloeosporioides Causing Anthracnose on Peanut in Chongqing, China. Plant Dis. (IF 4.5) Pub Date : 2023-11-30 Ying Li,Xinying Song,Kang He,Jing Yu,Manlin Xu,Zhiqing Guo,Xin Wang,Xia Zhang
In July 2022, dieback and discoloration were detected on infected stems of peanut in Qijiang District of Chongqing (106.56°E,29.41°N), China, with an incidence up to 5%. These peanut stems had disease symptoms typical of anthracnose with irregular gray-brown spots with dark brown edges, sunken, and necrotic. High temperature and high humidity were favorable for the growth of the pathogen. To isolate
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First Report of Calonectria ilicicola causing Leaf spot on Camellia sinensis in Yunnan province, China. Plant Dis. (IF 4.5) Pub Date : 2023-11-30 Ke Wan,Meilin Linghu,Xueqin Li,Zhu Li,Xiaoling Song,Sheng Qiang
Tea (Camellia sinensis (L.) Kuntze) is among the most significant industrial crops due to its distinctive fragrance and flavor generated (Bag et al. 2022). From October to December in 2021, a leaf spot disease affected the quality and yield of tea (C. sinensis var. assamica cv. Yunkang 10), in Pu'er (100.57°E, 22.45°N), Yunnan province, China. Based on the survey, the incidence was approximately 15%
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Evaluation and control of Fusarium acuminatum causing leaf spot in Saposhnikovia divaricata in Northeast China. Plant Dis. (IF 4.5) Pub Date : 2023-11-30 Yanyan Jiang,Lili Zhang,Shuni Wang,Yonggang Li,Yunlong Bai,Liping Cao
Saposhnikovia divaricata is an authentic Chinese herbal medicine in Northeast China named Guanfangfeng, which is made from very high quality plants for sufficient efficacy. However, leaf spot causes a very large reduction in the yield and quality of S. divaricata in Shuangyashan (126°54'E, 45°81'N), Northeast China. A total of 18 isolates were isolated from the diseased leaves of S. divaricata, following
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First Report of Charcoal Rot Caused by Macrophomina phaseolina on Dry Bean (Phaseolus vulgaris L.) in Western Canada. Plant Dis. (IF 4.5) Pub Date : 2023-11-30 Ahmed Abdelmagid,Yong Min Kim
In 2021, several dry bean (Phaseolus vulgaris L.) plants at the mid-seed-fill growth stage displaying wilting, chlorosis of the leaves and reduced vigor were collected near the Pembina - Emerson Border of Manitoba, Canada and North Dakota, USA. When symptomatic plants were examined, gray to dark brown discoloration was observed on the lower stem and the roots. Afterwards, brown to black discoloration
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Temperature-dependent sporulation of the fungus Coniella diplodiella, the causal agent of grape white rot. Plant Dis. (IF 4.5) Pub Date : 2023-11-30 Tao Ji,Luca Languasco,Ming Li,Vittorio Rossi
White rot, caused by the fungus Coniella diplodiella, can severely reduce grapevine yields worldwide. Currently, white rot control mainly relies on fungicides applied on a calendar basis or following hailstorms that favor disease outbreak; however, the control achieved with this strategy is often inconsistent or otherwise unsatisfactory. Realizing more rational control requires an improved understanding
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First report of Phyllachora maydis causing tar spot on corn in Delaware. Plant Dis. (IF 4.5) Pub Date : 2023-11-30 Madeline Grace Henrickson,Jill Pollok,Alyssa M Koehler
In October 2023, lesions consistent with descriptions of tar spot (Phyllachora maydis) were observed on corn (Zea mays) in Kent and Sussex County, Delaware (DE). Black, raised stromata were observed on leaves of commercially grown corn hybrids. Plants were at physiological maturity and disease severity was low with symptoms present on 1 to 10% of plants. In collected tissue, individual leaf severities
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First Report of Sclerotinia Rot Caused by Sclerotinia sclerotiorum on Artemisia capillaris in China. Plant Dis. (IF 4.5) Pub Date : 2023-11-30 Yan Min Liu,Shan Zhong,Rong Wang,Jian-He Wei,Xu Qiao,Wan-Long Ding,Yong Li
Artemisia capillaris (Asteraceae) is an annual herb found in ˃10 provinces in China. It is cultivated on ˃670 ha, with annual production around 2,500 tons. Its shoot is used in traditional Chinese medicine (Liu et al. 2021). From April to May 2023, Sclerotinia rot symptoms were seen at the Institute of Medicinal Plant Development (40.04°N, 116.28°E), Beijing, China. Disease incidence was up to 10%
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First report of anthracnose caused by Colletotrichum kahawae on Hypericum chinensis in China. Plant Dis. (IF 4.5) Pub Date : 2023-11-30 Junjie Ding,Hongbo Shen,Liangliang Yao,Xuedong Gao,Maoming Zhang,Zijie Wang,Yonggang Li,Xiaohe Yang
Hypericum chinensis is growing in popularity amongst consumers in cut-flower and pop-flower market as an ornamental woody plant for its florid berry and colorful flower. In August 2019, a new leaf spot disease was observed on H. chinensis in three commercial nurseries in Kunming (25°05'N, 102°72'E), Yunnian province, China. Disease symptoms were observed on approximately 40% of the plants one year
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First report of Pectobacterium brasiliense causing banana soft rot in Ecuador. Plant Dis. (IF 4.5) Pub Date : 2023-11-30 Alexander Toaza,Rosa Beatriz Caiza,Francisco Javier Garrido,Patricia Garrido,Luis Ramos,Francisco Flores
Banana (Musa spp.) is the most economically important crop in Ecuador, with exports representing 35% of the agricultural GDP of the country. It covers 230,000 hectares, mostly concentrated in three coastal provinces, Guayas, Los Ríos, and El Oro. Between July and September 2022, disease symptomatic banana cv. Williams plants were observed in commercial plantations located in two parishes in the province
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First report of Moroccan watermelon mosaic virus in pumpkin plants in Brazil. Plant Dis. (IF 4.5) Pub Date : 2023-11-30 Bruno Arcanjo Silva,Caterynne Melo Kauffmann,Helena Beatriz da Silva Mota,Paloma de Souza Queiroz,Amanda Moraes do Vale Batista,Stephanny Barreto Dos Santos Cárdenas,Débora Maria Sansini Freitas,Tatsuya Nagata
Cucurbita moschata is widely cultivated in Brazil, and zucchini lethal chlorosis virus, squash mosaic virus, papaya ringspot virus, watermelon mosaic virus have been reported as viral pathogens in this crop in Brazil. The leaf samples of C. moschata showing mosaic, blistering, and yellowing symptoms were collected from a commercial field in Petrolina, Pernambuco state and a commercial field in Juazeiro
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First report of Truncatella angustata causing leaf blight on Thuja plicata Donn ex D. Don in Canada. Plant Dis. (IF 4.5) Pub Date : 2023-11-30 David Noshad,Lise van der Merwe,Alvin Yanchuk
Western redcedar (Thuja plicata Donn ex D. Don) is one of the most important commercial tree species in British Columbia, generates more than $1 billion in economic activity annually and about 8-10 million trees are planted in reforestation efforts (Gregory et al. 2018). It has been selected as the provincial tree of British Columbia (BC) because of its tremendous economic, ecoogical and cultural value
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First Report of Fusarium verticillioides causing Stem Blight of Schizonepeta tenuifolia in China. Plant Dis. (IF 4.5) Pub Date : 2023-11-30 Pengpeng Li,Zhiling Zhou,Yueyue Wang,Yinshuai Tian,Xuejun Wei
Schizonepeta tenuifolia is an important medicinal plant in China. Over 10000 ha of S. tenuifolia is cultivated in the country annually. However, fungal diseases are a major limiting factor in S. tenuifolia production. In 2022, 50 ha in several S. tenuifolia fields in Hebei province were observed to be severely affected by a disease causing a yield loss of 30%. Results from field surveys suggested an
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Anthracnose of Macleaya cordata Caused by Colletotrichum aenigma in China. Plant Dis. (IF 4.5) Pub Date : 2023-11-30 Yiming Guan,Cai Shao,Hai Sun,Xiao Xi Pan,Yue Zhang,Lin Lin Zhang,Qiao Jin,Ning Liu,Qiu-Xia Wang,Ya Yu Zhang
Macleaya cordata (Willd.) R. Br. is a perennial herbaceous medicinal plant (Papaveraceae) commercially cultivated in China which has been studied for detumescence, detoxification, and insecticidal effect (Lin et al. 2018). In August 2021, anthracnose was observed in 2-year-old M. cordata plants in Benxi county, northeast China (41°45'48″N, 123°69'15″E). Dozens of irregular reddish-brown spots (3-11
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First report of branch dieback caused by Neoscytalidium dimidiatum on Styphnolobium japonicum (L.) Schott in China. Plant Dis. (IF 4.5) Pub Date : 2023-11-30 Zhihan Luo,Pengfei Liu,He Qi,Xiaoguang Chen,Jin Zhang,Chao Sun,Binggan Lou
Styphnolobium japonicum (L.) Schott (family Fabaceae Juss.) also called pagoda tree, is widely planted in northern China in landscape plantings, for erosion control and forestry. In recent years, symptoms of branch dieback were observed on S. japonicum in the southern part of Xinjiang province, China. From 2019 to 2022, in total ca. 1000 ha area was surveyed in Korla (41.68°N, 86.06°E), Bohu (41.95°N
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First Report of Apiospora arundinis Causing Leaf Spot on Polygonatum cyrtonema Hua in China. Plant Dis. (IF 4.5) Pub Date : 2023-11-30 Zikun Gong,Ying Yang,Linping Zhang,QianYing Luo,Jiayu Luo,Yang Zhang
Polygonatum cyrtonema Hua, which is a perennial herb of Liliaceae, can be used as clinical Chinese medicine for treating diabetes and asthma. It is widely cultivated in China, with 700 ha planted in Tonggu County, Jiangxi province (Chen et al. 2022). In June 2022, leaf spot symptoms were observed on P. cyrtonema in Tonggu county (28°71'42″N, 114°56'19″E), and the disease incidence was estimated to
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Irrigation Targeted to Provoke Ejection of Ascospores of Venturia inaequalis Shortens the Season for Ascospore Release and Results in Less Apple Scab. Plant Dis. (IF 4.5) Pub Date : 2023-11-30 Daniele Prodorutti,Riccardo Bugiani,Vincent Philion,Arne Stensvand,Emanuela Coller,Clelia Tosi,Claudio Rizzi,Gino Angeli,Ilaria Pertot
Trials were carried out in apple orchards of Emilia-Romagna and Trentino-Alto Adige in northern Italy to investigate the effects of sprinkler irrigation on possible reduction in inoculum and subsequent disease pressure of Venturia inaequalis, the ascomycete causing apple scab. In spring, volumetric spore traps were placed above apple leaf litter containing pseudothecia with ascospores of the fungus
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Preventive and Curative Effects of Treatments to Manage Strawberry Root and Crown Rot Caused by Neopestalotiopsis rosae. Plant Dis. (IF 4.5) Pub Date : 2023-11-27 Uriel Acosta-González,Santos Gerardo Leyva-Mir,Hilda Victoria Silva-Rojas,Angel Rebollar-Alviter
Strawberry root and crown rot caused by the fungus Neopestalotiopsis rosae is an emerging disease that has caused yield losses reaching 70% in Mexico and other regions worldwide. This research evaluated the effects of biological and chemical fungicides applied as preventive and curative applications for controlling root and crown rot caused by N. rosae in strawberries under greenhouse conditions. Treatments
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Resistance of ginseng gray mold pathogen, Botrytis cinerea, to boscalid and pyraclostrobin fungicides in China. Plant Dis. (IF 4.5) Pub Date : 2023-11-27 Mo Yi Yue,Rong Wang,Yan Min Liu,Bing Wei Chen,Wan-Long Ding,Yong Li
Gray mold caused by Botrytis cinerea severely threatens the yield of ginseng (Panax ginseng). Various categories of fungicides have been utilized to control gray mold on this crop. In this study, the resistance of 102 isolates of B. cinerea from 11 commercial ginseng growing regions in China to fungicide was examined. A total of 32.4% were resistant to boscalid with EC50 values that ranged from 12
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Novel magnesium-copper hybrid nanomaterials for management of bacterial spot of tomato. Plant Dis. (IF 4.5) Pub Date : 2023-11-21 Manoj Choudhary,Ying-Yu Liao,Ziyang Huang,Jorge Pereira,Swadeshmukul Santra,Apekshaya Parajuli,Susannah Da Silva,Jeffrey B Jones,Joshua H Freeman,Mathews L Paret
Bacterial spot of tomato (BST), predominantly caused by Xanthomonas perforans (Xp) in Florida, is one of the most devastating diseases in hot, humid environments. Bacterial resistance to copper-based bactericides and antibiotics makes disease management extremely challenging. This necessitates alternative solutions to manage the disease. In this study, we used two novel hybrid copper and magnesium
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First Report of Pantoea ananatis and Pantoea eucalypti causing onion leaf blight and bulb decay in Central Chile. Plant Dis. (IF 4.5) Pub Date : 2023-11-21 Jeannette Guajardo,Ingrid Nicole Vasconez,Fernando Dorta,Fabian Cuadros,Carolina Yañez,Miryam Valenzuela
Nearly 5,400 hectares of long-day onions (Allium cepa) are cultivated in the Central Zone of Chile (UTM 33°3´S to 37°24´S). During summer 2021-22 and 2022-23 (December to February), followed by high temperatures (around 35°C) and high humidity conditions, symptoms showing yellowing, soft rot, blight on old leaves, necrotic tips, and soft bulbs were observed. The affected plants were observed in "spots"
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First report of Diplodia quercivora causing branch cankers on declining chestnut oak (Quercus montana) in Virginia. Plant Dis. (IF 4.5) Pub Date : 2023-11-21 Devin Bily,Tashi Gyatso,Katlin M DeWitt,Amanda Conrad,Lori A Chamberlin,Matt Wolanski
Since the beginning of the twentieth century oak decline has been documented in central and eastern hardwood forests of the United States as a stress-mediated disease (Oak et al. 2016). Opportunistic canker pathogens, including Diplodia corticola, D. quercivora, D. sapinea, and Botryosphaeria dothidea have been associated with crown dieback of declining oak trees in several mid-Atlantic states (Ferreira
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Increased Diversity of Citrus Tristeza Virus in Europe. Plant Dis. (IF 4.5) Pub Date : 2023-11-21 Jelena Zindović,Miroslav Čizmović,Ana Vučurović,Paolo Margaria,Dijana Škorić
This study investigated the genetic diversity of citrus tristeza virus (CTV) isolates from Montenegro and Croatia, European countries with the northernmost citrus growing regions situated on the Eastern Adriatic coast. Fifteen complete or nearly complete CTV genomes were reconstructed from high-throughput sequencing of samples collected in distinct municipalities in Montenegro and Opuzen municipality
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First Report of False Rust caused by Synchytrium psophocarpi on Winged Bean (Psophocarpus tetragonolobus) in Taiwan. Plant Dis. (IF 4.5) Pub Date : 2023-11-21 Hao-Xun Chang,Cheng-Chun Huang,Po Kuan Lu
From September 2020 to January 2021, an unknown disease of winged bean (Psophocarpus tetragonolobus) was reported by local growers in the Toucheng Town, Yilan County (N24.91, E121.85). The disease occurs in all age of winged bean, and the occurrence tended to be higher in humid environment, such as branches in lower canopy or branches in high density. The disease symptoms, which also appeared to be
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First Report of Postharvest Fruit Rot Caused by Botrytis cinerea on Blue Honeysuckle (Lonicera caerulea L.) Fruit in China. Plant Dis. (IF 4.5) Pub Date : 2023-11-21 Haohao Yan,Yaozu Mi,Yuxuan Li,Hailian Zang,Liangchuan Guo,Junwei Huo,Zijian Man,Zexu Chen,Bing Zhang,Mingyu Sang,Chunyan Li,Yi Cheng
Blue honeysuckle (Lonicera caerulea L.) fruit is growing in popularity as a natural, functional 'super fruit', but its storage is challenged by pathogen infection. In June 2022, approximately 30% of 100 kg of blue honeysuckle fruits (cv. Lanjingling) obtained in Harbin, China (128.70°E, 44.87°N) showed postharvest fruit rot symptoms after 15 d of storage at 4°C, leading to whole fruit rotting with
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First Report of Anthracnose on Ilex cornuta caused by Colletotrichum aenigma in China. Plant Dis. (IF 4.5) Pub Date : 2023-11-19 Chunxi Yang,Jinyong Xiong
Ilex cornuta (Aquifoliaceae) is a dark green evergreen shrub with glossy leaves that is widely distributed in China and East Asia and used as an ornamental and medicinal plant. In March 2022, typical symptoms of anthracnose were observed on I. cornuta leaves (with approximately 30% of leaves affected) in Jiangxi Academy of Forestry, Nanchang city, Jiangxi Province, China. The early symptoms were light
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First Report of Powdery Mildew Caused by Erysiphe cruciferarum on Orychophragmus violaceus in China. Plant Dis. (IF 4.5) Pub Date : 2023-11-19 Yongqiang Tian,Xuetao Wang,Xu Su,Qian Zhou,Yali Wang,Yang Liu,Zikun Zhang
Orychophragmus violaceus is an annual or perennial herb in the Brassicaceae family. It is widely planted in China and used as an ornamental and green manure plant (Luo et al. 2022). In September 2022, a survey conducted in a 600 m2 garden in Lanzhou (36°06'N, 103°43'E) found that over 70% of O. violaceus plants were infected with powdery mildew, with 80% of the leaf area on the upper surface of infected
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First Report of Cercospora Leaf Spot Caused by Cercospora cf. flagellaris on Lonicera japonica Thunb. in Henan, China. Plant Dis. (IF 4.5) Pub Date : 2023-11-19 Yi Wen,YanHong Qin,Suxia Gao,Yuxia Liu,Wenping Qi,Shaojian Li,Chuantao Lu,Fei Wang
Honeysuckle flower (Lonicera japonica Thunb.) is a traditional Chinese medicinal plant. It is perennial and widely cultivated in China, Japan and Korea. From late August to October in 2021 and 2022, leaf spots symptoms were observed on L. japonica in different planting fields in Yuzhou, Yuanyang and Fenqiu districts, Henan province, China. The disease incidence was above 85% which reduce photosynthesis
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First Report of Bacterial Fruit Blotch caused by Kosakonia cowanii on Trichosanthis fructus in Jiangsu Province, China. Plant Dis. (IF 4.5) Pub Date : 2023-11-16 Xian Chen,Bao Tang,Pedro Laborda,Yancun Zhao,Fengquan Liu
Trichosanthis fructus is one of the most common medicinal plants in China. In September 2022, T. fructus fruit showed black necrotic spots and surface irregularities, with water-soaked lesions (Fig 1). The affected T. fructus fruit (five weeks after blossom) were located in a field in Huai'an Municipality, Jiangsu Province (33.85°N, 119.00°E). The incidence was approximately 50%, causing great losses
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Identification of 'Candidatus Liberibacter asiaticus' the Huanglongbing Bacterium in citrus from Colombia. Plant Dis. (IF 4.5) Pub Date : 2023-11-16 Catalina Chaves-Sierra,Maria Camila Rodríguez-Cruz,Fernan Santiago Mejía-Alvarado,Carolina Ramírez-Higuera,Antonio Mejía-Eslava,Hernan Mauricio Romero
Candidatus Liberibacter spp is the most prevalent microorganism in the citrus plant, associated with Citrus Huanglongbing (HLB), which is transmitted by the psyllid vector. In Colombia, the vector Diaphorina citri Kugayama has been reported in different regions, but "Ca. Liberibacter asiaticus" (CLas) has only been detected in insect vectors, not in citrus host plants. To identify the presence and
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First Report of Postharvest Fruit Rot of Loquat (Rhaphiolepis loquata) Caused by Ceratobasidium sp. in China. Plant Dis. (IF 4.5) Pub Date : 2023-11-15 Saini Li,Shicong Jiang,Weimin Zhang
Loquat, Rhaphiolepis loquata B.B.Liu & J.Wen (syn. Eriobotrya japonica) (Liu et al., 2020), is a subtropical evergreen fruit tree crop, for which China is the largest producer. Loquat fruit is favored by consumers for its attractive appearance, juicy taste, and rich nutrients (Tian et al., 2007). In May 2020, postharvest fruit rot was observed on loquat (about 10% of the fruits showed disease symptoms)
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First report of root-knot nematode, Meloidogyne javaniva, infecting Stachys byzantina on São Paulo, Brazil. Plant Dis. (IF 4.5) Pub Date : 2023-11-15 Edicleide Macedo da Silva,Daniel Dalvan Nascimento,Ricardo Koroiva,João Pedro Peixoto Fernandes,Rivanildo Junior Ferreira,Rafaelle Fazzi Gomes,Glauber Nunes,Pablo Forlan Vargas,Pedro Luiz Martins Soares
Stachys byzantina belongs to the Labiatae and is known by the names "peixinho-da-horta" (Brazil) and "lamb's ear" (USA). Its importance is associated with its medicinal properties (Bahadori et al. 2020) and nutritional aspects (Milião et al. 2022). Root-knot nematodes cause severe damage to plants and suppress production. In January 2021, plants of S. byzantina in the municipality of Jaboticabal (21°14'38
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First report of black leaf streak disease in bananas caused by Pseudocercospora fijiensis on Mauritius island. Plant Dis. (IF 4.5) Pub Date : 2023-11-15 Vivian Vally,Emmanuel Jouen,Bernard Pecheur,Dominique Carval,Luc De Lapeyre,Pierre-Yves Teycheney,Veronique Roussel,Sandrine Fabre,Christine Pages,Henri Adreit,Jean Carlier,Adrien Rieux
Pseudocercospora fijiensis, the causal agent of the black leaf streak disease of bananas (plants in the genus Musa) (BLSD), is considered to be the major economic threat to export-banana cultivation (de Bellaire, Fouré, Abadie, & Carlier, 2010). The disease has a worldwide distribution throughout the humid tropical regions and has been previously reported in the Southwestndian Ocean (SWIO) area: in
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The Sigatoka Disease Complex Caused by Pseudocercospora spp. and Other Fungal Pathogens Associated with Musa spp. in Puerto Rico. Plant Dis. (IF 4.5) Pub Date : 2023-11-15 Ashley Aviles-Noriega,Luz M Serrato-Diaz,Martha C Giraldo-Zapata,Hugo E Cuevas,Lydia I Rivera-Vargas
Bananas (Musa spp.) are among the world's most economically important staple food crops. The most important fungal leaf diseases of Musa spp. worldwide are caused by the Sigatoka disease complex, which comprise black Sigatoka (Pseudocercospora fijiensis), yellow Sigatoka (P. musae), and Eumusae leaf spot (P. eumusae). Considering the rapid spreading rate of black Sigatoka in Puerto Rico after its first
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Occurrence of Watermelon silver mottle virus in Peanut in China. Plant Dis. (IF 4.5) Pub Date : 2023-11-15 Biao Hu,Zhongtian Xu,Zhongyan Wei,Yue Huang,Chunyun Guo,Jian-Ping Chen,Zongtao Sun
Watermelon silver mottle virus (WSMoV), a member of the genus Orthotospovirus of the family Bunyaviridae, was first identified in watermelon in Okinawa prefecture, in Japan (Iwaki et al. 1984). Subsequently, it was reported in a variety of solanaceae and cucurbitaceae crops such as tomato, pepper, and watermelon (Jones et al. 2005). WSMoV is naturally transmitted by vector thrips, and cause chlorotic
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First report of Coniella quercicola causing leaf spot on Elaeocarpus decipiens in China. Plant Dis. (IF 4.5) Pub Date : 2023-11-15 Zixuan Tang,Lijun Chen,Wanli Ma,Qin Xu,Zhen Song,Jiamin Jiang,Jie Zhou,Ming Liu,Fuqiang Yin
Elaeocarpus decipiens Hemsl., is a member of the Elaeocarpaceae family. It is a broad-leaved evergreen tree (Zhang et al. 2021) and has been widely used in landscape and gardens virescence. In March 2022, leaf spots were observed on E. decipiens leaves with 30-40% disease incidence and about 25 of disease index in Wanzhou District (30°32'N; 108°22'E) of Chongqing. Lesions showed light yellowish brown
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Identification and distribution of the "Candidatus Liberibacter asiaticus"-Asian citrus psyllid pathosystem in Saudi Arabia. Plant Dis. (IF 4.5) Pub Date : 2023-11-12 Yasser E Ibrahim,Mohammed Ali Al-Saleh,Arya Widyawan,Mahmoud H El Komy,Hathal M Al Dhafer,Judith K Brown
Citrus greening disease was first reported in Saudi Arabia during the 1970's when characteristic foliar and fruit symptoms were observed in commercial citrus groves, however, "Candidatus Liberibacter asiaticus" (CLas) was not detected in symptomatic trees until 1981-1984 when CLas-like cells were observed by transmission electron microscopy in leaves collected from symptomatic citrus groves in southwestern
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High Diversity of Epicoccum Associated with Leaf Spot on Italian Ryegrass in Southwestern China: Three New Species and Six New Records. Plant Dis. (IF 4.5) Pub Date : 2023-11-12 Zhiting Xu,Lingling Xu,Jiaqi Liu,Dongying Chen,Huawei Cui,Longhai Xue,Chunjie Li
Italian ryegrass is widely cultivated for the productions of forage, hay and silage, due to its high nutritional value and good palatability. Leaf spots caused by fungi pose a serious threat to forage crops. In order to expand knowledge of fungi causing leaf spot in ryegrass (Lolium multiforum) in Sichuan, Yunnan, Chongqing and Guizhou of southwestern China, a comprehensive survey was undertaken from
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Molecular Identification of 'Candidatus Phytoplasma malaysianum'-Related Strains Associated with Areca catechu Palm Yellow Leaf Disease and Phylogenetic Diversity of the Phytoplasmas within 16SrXXXII Group. Plant Dis. (IF 4.5) Pub Date : 2023-11-12 Shao-Shuai Yu,An-Na Zhu,Haiyan Che,Wei-Wei Song
Areca catechu palm is an important cash plant in Hainan Island of China and even tropical regions worldwide. Areca catechu palm yellow leaf (AcYL) disease caused by the phytoplasmas is a devastating disease for the plant production. In the study, the phytoplasmas associated with the AcYL diseases were identified and characterized based on the conserved genes of the phytoplasmas, and genetic variation
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First report of Colletotrichum plurivorum causing anthracnose on Cucumis sativus in Brazil. Plant Dis. (IF 4.5) Pub Date : 2023-11-12 Rejane Maria Ferreira Silva,Thays Oliveira,Antônio Costa,Alexandre Reis Machado,Cristina Maria Souza-Motta,Gladstone Silva
Cucumbers have great economic and social importance. Annual worldwide production is approximately 80 million tons (FAOSTAT, 2019), 184 thousand tons of which are produced in Brazil (IBGE, 2020). Leaves with symptoms of anthracnose (necrotic brown or angular spots) were observed on cucumber plants grown in organic systems in September 2021, Pernambuco, Brazil (8°7'45''S, 35°16'167''W). About 40% of
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First Report of Charcoal Rot on Soybean Caused by Macrophomina phaseolina in Manitoba, Canada. Plant Dis. (IF 4.5) Pub Date : 2023-11-12 Yong Min Kim,Debra L McLaren,Stephen Ernest Strelkov
Macrophomina phaseolina (Tassi) Goid. is a soilborne necrotrophic fungal pathogen causing charcoal rot on approximately 500 plant species worldwide (Mengistu et al. 2015). Charcoal rot occurs in eastern Canada and many regions of the USA, causing substantial yield losses in soybean [Glycine max (L.) Merr.] (Allen et al. 2017; Bradley et al. 2021; Wrather et al. 2001). However, it has not been reported
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Three decades of rust surveys in the United States reveal drastic virulence changes in oat crown rust. Plant Dis. (IF 4.5) Pub Date : 2023-11-12 Erin Lynn Pfarr Moreau,Jakob M Riddle,Eric S Nazareno,Shahryar F Kianian
To better understand how the pathogenicity of the oat crown rust pathogen, Puccinia coronata f. sp. avenae (Pca), has changed in the United States, 30 years of USDA survey isolates (n=5,456) tested on 30-40 differential lines were analyzed for overall and Pc resistance gene specific virulence trends and correlations. Pca is incredibly pathologically diverse with 88% of races represented by a single
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Development of a multiplex PCR assay for the detection of tomato wilt caused by co-infection of Fusarium brachygibbosum, Fusarium oxysporum, and Ralstonia solanacearum based on comparative genomics. Plant Dis. (IF 4.5) Pub Date : 2023-11-12 Jun Liu,Siyi Deng,Wei Chang,Dazhao Yu,Hua Wang
Tomato is widely consumed worldwide as fresh or processed food products. However, soil-borne diseases of tomato plants caused by co-infection of various pathogens result in great economic losses to the tomato industry. It is difficult to accurately identify and diagnose soil-borne diseases of tomato plants caused by pathogen complexes. In this study, we investigated field diseases of tomato plants
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Effects of Pesticides on Red Rot of Planted Sugarcane. Plant Dis. (IF 4.5) Pub Date : 2023-11-10 Kézia Cristina da Silva Reis,Carolyn F Savario,Jeffrey W Hoy
Red rot, caused by Colletotrichum falcatum, is an important constraint to sugarcane production. In Louisiana, red rot primarily affects planted seed-cane and is more severe when billets (stalk sections) are planted rather than whole stalks. At planting, application of seed-treatment pesticides, particularly a combination of a fungicide and the insecticide thiamethoxam, has improved stand establishment
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First report of Lily virus X infecting Paris polyphylla var. yunnanensis in Yunnnan, China. Plant Dis. (IF 4.5) Pub Date : 2023-11-10 Zhe Wang,Xuhong Song,Rex Frimpong Anane,Zeli Chen,Shangyun Li,Guosong Wen,Hong Cai,Mingfu Zhao
Lily virus X (LVX) is a positive-sense ssRNA virus belonging to the genus Potexvirus in the family Alphaflexiviridae. LVX is known to infect plants of the genera Lilium and Tricyrtis in the family Liliacea. LVX was first reported in an asymptomatic lily (Lilium formosanum) from England (Stone, 1980), but has been shown to infect plants in the Netherlands (Chen et al. 2005), the United States (Jordan
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Survival of Sclerotinia sclerotiorum Sclerotia in Central New York. Plant Dis. (IF 4.5) Pub Date : 2023-11-09 Sarah Jane Pethybridge,Sean Murphy,Margie Lund,Julie R Kikkert
White mold caused by Sclerotinia sclerotiorum is a serious disease affecting many field and specialty crops in New York (NY). The primary inoculum for white mold is sclerotia that are hardened masses of mycelia that survive adverse environmental conditions and periods of non-hosts. However, NY crop guidelines lack rotation and residue management recommendations based on local knowledge of sclerotial
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Unveiling dominant fungal pathogens associated with root rot of hybrid bermudagrass based on culture dependent and independent method. Plant Dis. (IF 4.5) Pub Date : 2023-11-09 Zhiling Cao,Yuxin Zhou,Kurt Lamour,Zhimin Yang,Jun Liu,Jian Hu
Hybrid bermudagrass (Cynodon dactylon × C. transvaalensis) is widely used as turf in southern and transition zones of China. From June to September in 2022, an unknown disease was consistently observed on hybrid bermudagrass in different regions of Nanjing China, exhibiting distinct symptoms of leaf necrosis, severe root rot and circular or irregular necrotic patches with 20-300 cm in diameter. In
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First Report of Clover yellow vein virus Infecting Senna septemtrionalis (Arsenic bush). Plant Dis. (IF 4.5) Pub Date : 2023-11-09 Han Hu,Min Jin,Yi Zhang,Xiaoli Shao,Jianguang Wang
Clover yellow vein virus (ClYVV) is a member of the genus Potyvirus, family Potyviridae and was reported to infect many plant species, such as Ammi majus L., Phaseolus vulgaris L., Vicia faba L., Lens culinaris L., Borago officinalis L., Cicer arietinum L., Gladiolous gandavensis L., Glycine max L., Trifolium repens L., and Dendrobium sp. (Irey et al. 2006; Ortiz et al. 2009; Park et al. 2014; Yoon
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Optimization and Validation of Singleplex and Multiplex RT-qPCR for Detection of Citrus bark cracking viroid (CBCVd), Hop latent viroid (HLVd), and Hop stunt viroid (HSVd) in Hops (Humulus lupulus). Plant Dis. (IF 4.5) Pub Date : 2023-11-09 Tanja Guček,Jernej Jakše,Sebastjan Radišek
Direct crop losses due to plant diseases and the measures used to control them have significant agricultural and economic impacts. The shift from diverse small-scale to large-scale genetically uniform monoculture production, along with agricultural intensification and climate change, has led to several known epidemics in man-made agroecosystems that have been rendered more vulnerable to pathogens.
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First report of Diplodia bulgarica causing black canker on apple in California. Plant Dis. (IF 4.5) Pub Date : 2023-11-08 Karina Elfar,Carlos Carachure,Marcelo I Bustamante,Ellie Andrews,Akif Eskalen
California is the sixth largest apple-producing state in the United States with a production that reached 4,654 ha in 2021. During the late winter of 2023, black canker symptoms were observed on branches of 'Gravenstein' apple (Malus domestica) in two commercial orchards in Sonoma County, California. The prevalence of symptomatic trees ranged from 10 to 30%. External symptoms included charcoal looking-cankers
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First report of Pectobacterium aroidearum causing soft rot on leaf mustard in China. Plant Dis. (IF 4.5) Pub Date : 2023-11-08 Yanan Zhang,Honglong Chu,Kun Dong,Kexian Yuan
Leaf mustard (Brassica juncea [L.] Czern. et Coss.) is widely planted in China as an important leaf vegetable. In March 2022, water-soaked and mushy rot symptoms were observed on leaf mustard plants in the field of Zhaotong (27.85°N; 105.05°E), Yunnan, China. The incidence of symptomatic leaf mustard was approximately 10%. The isolation of the causal agent followed the method of Peng et al. (2023)
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First Report of Calonectria montana Causing Leaf Spot on Ligularia fischeri in China. Plant Dis. (IF 4.5) Pub Date : 2023-11-08 Yiming Guan,Yue Zhang,Hai-Tao Cheng,Xiao Xi Pan,Lin Lin Zhang,Qiao Jin,Ning Liu,Qiu-Xia Wang,Ya Yu Zhang
Ligularia fischeri (Ledeb.) is a perennial herbal plant of Compositae that is cultivated commercially in China as a medicinal, ornamental, and edible plant. Leaf spots were observed in 2-year-old L. fischeri in Benxi County of northeast China, in August 2021. Irregular reddish brown spots ranging from 3 to 11 mm were observed on infected leaves, and each leaf had dozens of spots (Fig. 1). As the disease
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First Report of Lasiodiplodia pseudotheobromae causing Postharvest Decay of Strawberries in Florida. Plant Dis. (IF 4.5) Pub Date : 2023-11-08 Jiuxu Zhang,Jiaqi Yan,Jinhe Bai,Cuifeng Hu,Tengfei Pan,Yisel J Carrillo,Daniela E Cardenas,Liliana M Cano,Mark A Ritenour
Postharvest decay of strawberry (Fragaria × ananassa Duch.) is a major factor causing fruit losses. Strawberries were obtained from various harvests at cooling facilities located in Dover and Plant City, FL during the 2018-19 and 2019-20 seasons. After the fruits were incubated at 22ºC for up to 5 days (d) to promote disease development, Lasiodiplodia decay was observed at up to 3% from some harvests
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First report of Pantoea anthophila causing shoot dieback disease of Ceylon ironwood (Mesua ferrea Linn.) in Malaysia. Plant Dis. (IF 4.5) Pub Date : 2023-11-08 Muhammad Iqbal Hakim Johari,Dzarifah Zulperi,Norsazilawati Saad,Siti Izera Ismail,Syari Jamian,Sumaiyah Abdullah,Daljit Singh Karam Singh,Keeren Sundara Rajoo
Ceylon ironwood (Mesua ferrea Linn.) or Penaga lilin is one of Asia's most popular tropical herbal plants, including Malaysia (Sharma et al., 2017). The trees are cultivated for their aesthetic value and pharmacological properties, especially as traditional remedies for asthma, dermatopathy, inflammation, and rheumatic conditions (Adib et al., 2019). In August 2022, a disease survey was conducted on
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Identification of a Locus for High-Temperature Adult-Plant Resistance to Stripe Rust in the Wheat Yr8 Near-Isogenic Line through Mutagenesis and Molecular Mapping. Plant Dis. (IF 4.5) Pub Date : 2023-11-08 Yuxiang Li,Meinan Wang,Xiaoping Hu,Xianming Chen
Aegilops species are wheat relatives that harbor valuable disease resistance genes for wheat breeding. The wheat Yr8 near-isogenic line, AvSYr8NIL, has long been believed to carry only Yr8 for race-specific all-stage resistance to stripe rust, caused by Puccinia striiformis f. sp. tritici, derived from Aegilops comosa. However, AvSYr8NIL has been found to have high-temperature adult-plant (HTAP) resistance