Abstract A survey was conducted to document the incidence of white mold disease in country bean production areas at Bogra, Pabna, Jessore, Sylhet, Hobigonj and Gazipur districts in Bangladesh during 2016–17. A total of 115 farmers’ fields was surveyed from early vegetative to end of harvesting stages. Pathogens were collected from diseased stems, racemes and pods. Soil samples were collected from the same fields. White mold disease was identified based on symptoms in the field. White mold disease infection was recorded in 100% of the surveyed fields in Shahjahanpur upazila of Bogra district, while approx. 90, 80, 60 and 20% of the fields were infected in Bahubal of Hobigonj; Golapganj of Sylhet; Ishordi of Pabna and Monirampur of Jessore, respectively. White mold was not found in any of the fields surveyed in Joydebpur, Gazipur. Disease incidence and severity were higher in Shahjahanpur of Bogra and Bahubal of Hobigonj district. Moderate disease incidence and severity were observed in Golapganj of Sylhet. Pathogen infection was higher in the fields with loamy fine sandy soil with pH of 5.11–6.22. Globose to irregular black sclerotia developed in infected plant parts and the sclerotia germinated and produced apothecia in the fields after rain. Hyaline, branched, well developed and septate mycelia developed on potato dextrose agar medium. The hyphae were 2.0–7.2 μm in width. After five days of incubation, the subsurface mycelial cells swelled and formed dark black sclerotia. The sclerotia were 1.5–6 mm in width and 2–17 mm in length. Sclerotia germinated, and brown colored round to globose shaped apothecia developed at the end of a long stipe. The length and diameter of apothecia were approximately 4–21 mm and 2–8 mm, respectively. Asci were hyaline and cylindrical in shape, while the ascospores were elliptical. The size of ascus and ascospore was 68–155 × 4.5–6.01 μm and 4.7–6.94 x 4–6.2 μm, respectively. Calcium oxalate was formed on the wall surface of the asci. Disease incidence was negatively correlated with pH and calcium content in the soil while apothecia formation was positively correlated with rainfall and humidity.

中文翻译：

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孟加拉地区 Sclerotinia sclerotiorum (Lib.) de Bary 引起的乡村豆 (Lablab purpureus L.) 的调查、形态和白霉病与土壤理化性质和天气条件的关系

摘要 进行了一项调查，以记录 2016-17 年孟加拉国 Bogra、Pabna、Jessore、Sylhet、Hobigonj 和 Gazipur 地区乡村豆类产区的白霉病发病率。共对 115 个农民的田地进行了从早期营养到收获阶段的调查。从患病的茎、总状花序和豆荚收集病原体。土壤样品采集自相同的田地。白霉病是根据田间症状确定的。在 Bogra 区 Shahjahanpur upazila 的调查田中，100% 的田地都记录到了白霉病感染，而大约 在 Hobigonj 的 Bahubal，90%、80%、60% 和 20% 的田地被感染；锡尔赫特的戈拉普甘杰；分别来自帕布纳的 Ishordi 和 Jessore 的 Monirampur。在加济布尔的乔伊德布尔调查的任何田地中都没有发现白色霉菌。Bogra 的 Shahjahanpur 和 Hobigonj 区的 Bahubal 的发病率和严重程度较高。在锡尔赫特的 Golapganj 观察到中等发病率和严重程度。在土壤为肥沃细沙土壤，pH 值为 5.11-6.22 的田间病原菌感染率较高。受感染的植株部分发育球形至不规则的黑色菌核，雨后菌核在田间萌发并产生菌核。在马铃薯葡萄糖琼脂培养基上发育的透明、分枝、发育良好和有隔膜的菌丝体。菌丝宽度为 2.0-7.2 μm。培养五天后，表层下菌丝细胞膨胀并形成深黑色菌核。菌核宽 1.5-6 毫米，长 2-17 毫米。菌核萌发，在长柄末端发育褐色圆形至球形的菌核。apothecia 的长度和直径分别约为 4-21 毫米和 2-8 毫米。子囊呈透明圆柱形，而子囊孢子呈椭圆形。子囊和子囊孢子的大小分别为 68-155 × 4.5-6.01 μm 和 4.7-6.94 x 4-6.2 μm。草酸钙形成于腹水壁表面。病害发生率与土壤中的 pH 值和钙含量呈负相关，而孢子囊形成与降雨和湿度呈正相关。