Powdery mildew is a particularly common disease in the cultivation of kiwifruit, and it is also the most troublesome disease for fruit farmers. Timely pesticide control is the key to reducing losses.
Symptoms: When the powdery mildew is just infected, there are small needle-like spots on the leaf surface of the crop. Then these spots will gradually become larger, and irregular yellow-green lesions will be produced on the front side of the leaves. These lesions The shape is nearly circular or irregular. At the leaf boundary is not very obvious, many lesions will likely join together to form a large spot. A layer of white powdery mildew appears on the lesions on the back of the crop leaves, and many yellow-brown to dark-brown small particles will be scattered on those lesions later in the disease. The leaves of the diseased crops are curled, dry and withered, and are relatively easy to fall off.
So how do we solve the problem of powdery mildew protecting kiwifruit? Now, the China Pesticide Network Xiaobian will share with you three prevention measures.
First, strengthen the cultivation management, increase the use of phosphorus fly, potash fertilizer and organic fertilizer, avoid excessive use of nitrogen fertilizer, and enhance the disease resistance of crops.
Second, pay attention to the timing of the topping of the vines, so that the branches can be evenly distributed on the frame to ensure good ventilation and light transmission. It is combined with winter trimming, sweeping leaves, and burning together.
Third, use 25 percent of the powder rust 2000 times solution, or 15 percent of the powder rust 1000 times solution, or 45 percent of the sulphur glue suspension 500 times at the beginning of the disease. Liquid, or 40% of the fungicide copper 800 times solution, and 50% of the wettable powder methyl Torro 800 times solution, required to spray once every 7 to 10 days , a total of 2 consecutive applications.
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