Eggplant early blight is mainly harmful to leaves. The lesions are round or nearly round, with brown edges, grayish white in the middle, concentric ribs, 2-10 mm in diameter. When the humidity is high, the disease minister has a fine gray-black mold. In the late stage, the central part of the lesion is brittle, and the severe diseased leaves fall off early.
First, the route of transmission
1 The mycelium is overwinter in the sick body or under the seed coat. It occurs early in the nursery stage, and can also occur in the adult stage.
2 After the plant is infected, the conidia produced in the diseased part are re-infected by means of wind or rain or irrigation water.
Second, the disease conditions
1 Eggplant early blight has a wide range of temperature, and humidity is the main condition for the onset. Generally warm and wet.
2 Management is extensive, the bottom fertilizer is insufficient, the growth is weak, and the disease is serious.
Third, prevention and treatment methods
1. Remove the sick body and carry out rotation for more than 3 years.
2, seed disinfection, soaking with warm water at 52 ° C for 30 minutes, or 55 ° C warm water for 15 minutes, immediately moved into cold water to cool, and then germination sowing.
3, spraying at the beginning of the disease, 75% chlorothalonil WP 500-600 times solution, 58% metalaxyl doubling solution, 64% anti-virus WP WP 400-500 times solution, 50% gram dandan wettable powder 400 Wet powder 400 times solution, once every 7-10 days, continuous control 2-3 times.
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