Symptoms mainly harm pods and can also harm leaves and stems. The early lesions were dark brown in colorectal disease, became pale afterwards, sunken, and had black spots in the last round. The young fleas often fell off. The old pods were infected and drooping did not fall. Most of the diseased pods were not strong, although the disease was light, they were scarred. However, they are small, easy to shrink, and bitter. Stems and petioles infected to produce an irregular, grayish-brown spot with numerous small black spots on the upper part of the stem, causing dryness above the part.
The pathogen, Macrophoma mame Hara, is known to be a Fungi of the genus Aspergillus. The conidiospore was scattered or aggregated, buried under the epidermis of the diseased part and exposed with an orifice. The conidiospore was dark brown, spherical to oblate spheroid, and the wall was membranous, with a size of 104-168 μm. Conidia are oblong to long ovate, single cells are colorless, and both ends are obtuse, with a size of 17-236-8 (μm).
Transmission routes and pathogenic conditions The pathogens were infected by conidiospores on diseased bodies or with hyphae on diseased seeds, becoming the source of infestation at the beginning of the year. The occurrence of the disease is related to the prevalence and rainfall in the pod-breaking period. The incidence of morbidity in heavy rainy weather is heavy in the year, and it is usually 8-10 months in the south, and it is easy to be sick in the north from August to September.
Control methods (1) Establish disease-free fields and use disease-free seeds. Heavy-onset regions have more than three years of rotation. (2) Seed treatment. Seed dressing with a seed weight of 0.3% 50% thiram or seed dressing double powder.
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