Symptoms mainly affect the leaves, petioles, and stems. Leaf lesions along the veins produce brown thin strips that turn dark brown later. The petiole became infected with dark brown from top to bottom, and some had longitudinal cracks or depressions, which caused the petioles to distort or the leaves reversed to droop, and the fine bases became black, causing the leaves to wither. Stem infection mainly occurs in shoots. Soybean meal infected with browning from the edge or stalks, distorted deformity, less strong or thin black particles. The diseased part often produces yellow-white powder particles.
The pathogen Septog10eum sojae Yoshii & Nish. called soy sticky cells, belonging to the fungus Aspergillus Suberii. The conidiophores were clustered under the epidermis of soybean and then penetrated the epidermis. Conidia are cylindrical to long rhomboid, colorless, straight or slightly curved, with 1-4 septa.
Transmission routes and pathogenic conditions The pathogens overwinter on the diseased body with conidium discs, but they can also overwinter on the seeds and become the primary source of infection in the following year.
Prevention and control methods (1) At present, the disease only occurs locally in China, so the seeds must be strictly quarantined to prevent the propagation of seeds. (2) Clean the pastoral area after harvest can reduce the source of bacteria. (3) Seed dressing with 40% seed weight doubled or 50% benomyl wettable powder with 0.4% seed weight. (4) If necessary, spray 50% benomyl WP 1500 times or 36% Thiophanate-suspension 600 times and 50% carbendazim WP 600-700 times during the scab phase.
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