How to choose pesticides for leek gray mold
Amaranth is a common vegetable in life and has a very high nutritional value. In the process of planting amaranth, gray mold is a common disease, and if it is not timely prevented, the consequences are unimaginable. So what should I do with amaranth gray mold? This article will introduce you how to choose a drug for amaranth gray mold.
First, the symptoms
1. White-point type; white or taupe spots on the front and back of the leaf, which develop downward from the tip of the leaf. The lesions are fusiform or elliptical, and the plaques are merged into each other at the late stage of the disease, causing the half-leaf or the whole leaf to be burnt.
2. Dry tip type; rotted down from the mouth of the cutting knife, initially water-soaked, then pale green, with brown wheel pattern, the lesion spreads mostly semi-circular or "V" shape, and can be down Extends 2-3 cm, is yellowish brown, and has a grayish-brown or gray-green fluffy mold on the surface.
3. Wet rot type; when the humidity is large, the surface of the dead leaves is densely ash to green velvet mold, accompanied by mildew, and no white spots are produced on the leaves.
Second, prevention and treatment methods
1. Select resistant varieties; such as Zhonghao No. 2, 791 Xueyan, Zafafa No.1, etc.
2. Clean the countryside. After the leek is harvested, the sick body is removed in time, buried or burned to prevent the spread of germs.
3. Timely ventilation and dehumidification is the key to prevention and treatment of the disease. The amount of ventilation should be determined according to the growth of amaranth. When the freshly cut leeks or the outside temperature is low, the ventilation volume should be small or delayed to prevent the wind from sweeping. 4 Biological control; Xia's blue soil conditioner is 25 kg per mu, and organic fertilizer is added to supplement trace elements to improve the soil environment.
5. Cultivate strong seedlings; Apply organic fertilizer, timely topdressing, watering, weeding, raising cockroaches, improve plant disease resistance. Before planting, apply 5000-7000 kg of decomposed farmyard manure, 15 kg of diammonium phosphate, 50 kg of plant ash, and deep into the soil; fill the water and plant the water in time after planting. Topdressing twice before the frost, each time applying 15 kg of urea per acre, timely filling the water after topdressing.
6 In the early stage of the disease, spray methyl thiophanate or mancozeb 1 kg per mu. In addition, it can also spray 65% ​​methyl sulfide, mildew WP 1000 times solution or 25% prochloraz oil 1000 times solution or 40% pyrimethanil suspension agent 1200 times solution, spray once every 10 days, even spray 2 -3 times.
More pesticide knowledge , please pay attention to China Pesticide Network
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