Leek mold, also known as white spot disease, is a common disease that occurs in winter and spring. In the early December, the disease began to increase. With the growth and development of the leek, the condition gradually worsened, and can continue until the end of April in the coming year. Generally, the serious reduction of production is 20 to 30 percent. In addition, diseased leaves are often accompanied by musty taste, which degrades quality.
The disease mainly occurs on the leaves. When the initial infection occurs, the leaves produce white to light grayish-brown dots on the foliage surface. The front surface is more than the back surface, and it develops downward from the tip of the leaf. After the spots expand, it is fusiform or elliptical. When the humidity is high, The surface of the lesions produced a layer of diluted mildew, and the later lesions merged into large pieces until the half leaves or whole leaves were dry and coke. Sometimes diseased leaves do not produce white spots. They are rotted by the cutting knife's mouth and are initially immersed in water. They are light green with a brown ring pattern. The lesions are mostly semi-circular to v-shaped and can extend downwards by 2 to 3 centimeters. , diseased leaves yellow brown. When the humidity is high, a gray-brown or gray-green villous layer of mold is produced.
Its prevention and control methods are:
First, the selection of disease-resistant varieties such as Huang Miao, Ke mold 1, No. 2 Zhonghe, ferrets and so on.
Second, the use of non-drip wet film, timely wind, cooling, reduce air humidity, to prevent excessive temperature inside the shed.
Third, timely removal of diseased leaves buried or burned.
Fourth, the early stage of drug control can be sprayed with 50% carbendazim WP 500 times, or 70% thiophanate-methyl 800 times, or 50% acetaminophen WP 1500 times, per acre The liquid is 40 to 50 kg, sprayed every 5 to 7 days, and sprayed 2 to 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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