There are good ways to prevent crop downy mildew

Downy mildew is a worldwide disease commonly occurring in many important crops. Its occurrence has caused irreparable and huge losses to agricultural production. So, what is the cause of downy mildew, how to prevent it? Liu Jianhui, Associate Professor of Horticulture College of Northwest Agriculture and Forestry University, gave good advice to growers.

Etiology

Downy mildew, commonly known as white mold, downy mildew, etc., the disease in the continuous rainy weather, high air humidity, or condensation of long duration is popular. The average annual minimum temperature is heavy and the disease is heavy. Early onset of sowing, defertilization, or heavy virus disease, etc., are severe.

symptom

The main damage to the leaves, the early appearance of leaves appear gray, light yellow or yellow-green peripheral lesions are not obvious, after the expansion of the brown-brown lesions, lesions are limited by the veins were polygonal or irregular shape, dense white leaves close back Creamy mildew. The lesions are connected to each other for a long time, so that the diseased leaves will die either locally or entirely. The diseased plants often dry up from the outer layer to the inner layer. In severe cases, there is only a small heart ball.

Control methods

1. It is very important to choose disease-resistant varieties. Sometimes the two varieties are planted in the same vegetable field, and the susceptible varieties are messy, but the disease-resistant varieties are not serious.

2. Proper sowing practice has proved that early sowing is more severe than late sowing, but late sowing often affects the heart and reduces the yield. Therefore, proper sowing should be done according to the local climate.

3, to strengthen the management of ground water volume Downy mildew in the continuous rainy weather, high humidity, or long-term condensation is prone to pop, so reasonable control of soil moisture is extremely important, the field soil moisture content to be controlled at about 25%, After the rain or irrigation, the water in the ditch should be promptly removed.

4, the use of pesticides in the control of the use of pesticides against downy mildew is necessary to prevent and control, metalaxyl and chlorothalonil on downy mildew have a good control effect.

5, clean gardens should pay attention to see the seedlings, if the symptoms of the disease should be found in the plant should be rooted in time with the soil will be dug up the diseased plants, and far away from the field for deep-buried treatment, the soil where the diseased plants are sterilized with quicklime to Anti-virus spreads.

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