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2. Flowering result period. At this time, the disease is extremely prone to pandemic and has a great impact on the yield. It is the most critical period for the prevention and control of vegetable diseases. The main cause of the disease is the transfer of vegetables from vegetative growth to reproductive growth, which results in the decline of leaf nutrients and resistant substances, and the reduction of disease resistance, which creates favorable conditions for the infection of various pathogens. Control methods: 1 cultivate robust plants and improve plant resistance. 2 Strengthen field management, timely top dressing and foliar fertilization, improve plant nutrition, remove old leaves in time, and strengthen ventilation and light in the fields. If it is found that the disease should be immediately sprayed with therapeutic agents for control. In general, for diseases such as epidemics, downy mildew, etc., it should be sprayed once every 7 to 10 days during the flowering period, and can be controlled by spraying 3 to 4 times.
The key to vegetable disease prevention is "two phases"
1. Seedling period. This is the period when vegetable diseases are most likely to occur. The main causes are bacterial blight, damping-off, and gray mold, as well as root disease caused by low temperatures and excessive soil moisture. Control methods: 1 The seeds should be disinfected to ensure that the seeds are free from germs. 2 Seed beds should be treated with new disease-free soil and treated with pesticides to prevent the seedbeds from colonizing. 3 Control the watering of the seedbed to prevent the seedbed from causing diseases due to excessive humidity. 4 Summer nursery should pay attention to shade and cooling of seedbeds. 5 Strengthen seedbed management, nurture strong seedlings, and improve disease resistance. 6 The diseased seedlings were removed in a timely manner and immediately treated with medication.