Prevention and Control of Peanut net spot

Peanut net spot, also known as brown spot and moire spot, often occurs mixed with leaf spot, which can cause early peanut leaf shedding and seriously affect peanut yield. The main results are as follows: 1. Most of the diseases begin to occur at the flowering stage, and the peak period is from podding to maturity, which mainly harms the leaves. Round or irregular black-brown spots are produced along the main vein at the beginning, and there is a halo circle around the disease spots. After that, irregular brown spots with reticulate edges appear on the front of the leaves, and millet brown spots can be seen in the diseased part. When it is overcast and rainy, the disease spot on the leaf surface is large, dark brown, the disease spot on the back of the leaf is not obvious, light brown, the disease spot is fused in severe cases, and the disease spot is easy to rupture and perforate under dry conditions. Once the leaves are infected, they fall off easily. Second, prevention and treatment methods in the initial stage of the disease, use 70% mancozeb wettable powder 500 times liquid, 75% chlorothalonil wettable powder 700 times liquid, 64% chlorothalonil wettable powder 500 times liquid, 70% ethyl phosphorus ·manganese zinc wettable powder 500 times liquid or 80% spray gram wettable powder 600 times liquid, spray once every 10 minutes 15 days, even 2 times 3 times.