Shed vegetables winter and spring skill against gray mold

September 20, 2019

Leek mold, also known as white spot disease, is a common disease that occurs in winter and spring. The disease usually occurs at the beginning of December every year. It mainly occurs on the leaves. White spots appear on the surface of the leaves at the beginning of the infusion. The face is more than the back, and it develops from the tips of the leaves. The lesions in the later stages mingling with each other and forming large pieces. Leaves or whole leaves dry coke. Sometimes diseased leaves do not produce white spots, rot down from the harvesting blade, and are initially immersed in water, followed by light green, brown rims, lesions are mostly semicircular to the "V" shape, can extend down 2 ~ 3 cm, diseased leaves yellow brown, humidity, gray-brown or gray-green villous layer. Its prevention and control methods are:
1, choose resistant varieties. Such as yellow seedlings, Ke mold 1, Zhongwan No. 2, snowballs and so on.
2, dehumidification. The use of non-drip film, timely release, cooling, reduce indoor humidity, prevent the temperature inside the shed too high.
3, timely removal of diseased leaves. Buried or burned.
4, pharmaceutical control. In the early stage of disease, 50% carbendazim WP may be sprayed with 500 times, or 50% fast keratin 1500 times, or 70% thiophanate-methyl 800 times, or 50% TD WP 1000 times. Liquid, or 50% acetaminophen wettable powder 1500 times, 40 to 50 kg per 667 square meters of liquid, spray once every 5 to 7 days, and even spray 2 or 3 times. Note alternate medication. In case of cloudy days, it is best to use Chlorothalonil or Sulfonamide as a smoke suppressant.

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