The conidia or mycelia adhere to the seed or overwinter in the field along with the diseased body. Sprouting the seed with bacteria, the seedlings that are infected, diseased shoots and conidiospore on the cotyledon or young stem, the production of conidia spread by rain, initial infection and reinfection, the incubation period of 6 to 8 days. 15 to 20°C in the field and wet and wet.
Control methods: (1) Two-to-three-year rotations are adopted between severe disease fields and non-legume vegetables. (2) Choose to leave disease-free seeds or pre-soak seeds in cold water for 4 to 5 hours, then place them in warm water at 50°C for 5 minutes, transfer them to cold water, and cool and dry. (3) Select the Gaoshao plots, make them densely planted, adopt formula fertilization techniques, and increase the resistance to disease. (4) After the harvest, we should clean the garden in time and perform deep turning to reduce the source of overwintering bacteria. (5) Spray 50% benomyl WP 1500 times, 40% polysulfide suspension 600 times, 70% thiophanate-methyl WP 500 times, 75% chlorothalonil wettable powder 600 times liquid. 7 to 10 days to prevent 1 time, continuous control 2 to 3 times. The drug was stopped 7 days before harvest.
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