ã€Main features】: Mainly damage the leaves. A small spot of chlorosis began to appear on the leaf, brown necrotic spots formed in the middle and the edges were not obvious, the diameter was 0.5-1.5 cm.
ã€Features】: The disease is a fungal disease. The pathogen is melonella. The pathogenic bacteria overwintered on the diseased body and seeds, spread through air currents and rainwater, and invaded through stomata. In the rainy season, the disease is easy to occur and prevalent.
[control methods]:
(1) Seed treatment Seeds are soaked in water at 56°C before sowing, soaked for 24 hours when the water temperature drops to room temperature, then germinated at a temperature of 30-32°C, and 3 mm buds can be sowed.
(2) Agricultural control is implemented for more than two years of rotation with non-melon vegetables. The appropriate sowing, bitter gourd thermophilic, temperature below 10 °C plant growth inhibited, so the sowing should not be too early. Use disease-free seeds.
(3) Chemicals are sprayed at the early stage of the disease. Commonly used pesticides include 50% of MMR (carbendazim plus valeromycin), 1000 to 1500 times of wettable powder, 50% of sulfur suspension, 500 to 600 times of liquid, and 60 % Anti-mildew Po Ultra Micro WP 600-700 times. Prevention and treatment once every 10 days, continuous control 2-3 times. Protect the land with 45% chlorothalonil smoke agent or 300-200-250g smoke-killing agent per 667m2, or spray 1% chlorothalonil dust agent for 1kg per 667m2. Prevent and treat once every 7-9 days, depending on the condition prevention and control l-2 times.
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