Damage symptoms
Corbicula plants can be infected on the ground, but mainly damage the leaves, stems and flower axis. First, the disease on the leaf near the ground, the beginning of a white mold, after the expansion of the mold on the white spot, born on both sides of the leaf; stem disease occurs in the joints, when conditions are right, the white powder quickly covered Flowers and fruits, mostly from the lower part of the plant upwards, the late mycelium turned from white to light brown, the Department of the Ministry of many small black spots. The ascostic shell of the pathogen. Soil moisture, nitrogen fertilizer is too much, lack of potassium and plants too dense or weedy more susceptible to disease.
Control methods
1. Breeding varieties resistant to powdery mildew, strengthening the greenhouse temperature and humidity management.
2. Remove the diseased body promptly after harvest to reduce the source of overwintering bacteria.
3. At the beginning of the disease, dust or smoke may be used in the greenhouse. Spray 10% more dust in the evening, 1kg per mu or 45% chlorothalonil smoke agent, 250g per mu, use dark fire to ignite smoke overnight.
4. Use 30% Teflon wettable powder 1500~2000 times liquid or 50% sulfur suspending agent 200~300 times, 2% Wuyimycin water or 2% agricultural anti-120 water agent 150 times Liquid, 15% triadimefon (triadonine) wettable powder 1500 times, 25% enemy demulsifiable oil 3000 times, 15% triadimefon (triadimefon) wettable powder 2000 times liquid plus 25% enemy demulsifiable oil 4000 times Liquid, 40% Fuxing EC 9000 times, every 7 to 21 days, continuous control 2 to 3 times. The drug was stopped 7 days before harvest.
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