What are the diseases of planted beans to be prevented?

What are the diseases of planted beans to be prevented? Please introduce the following diseases in planting beans: first, identification and control of coal mildew 1, symptoms: mainly harmful leaves, stems and pods. At the beginning of the disease, there were purple-brown spots on both sides of the leaf, and after enlargement, it showed a nearly round dark brown spot with a diameter of 1 cm to 2 cm, the edge was not obvious, and the surface of the spot was dense with soot-like mold (especially on the leaf surface). In severe cases, the early defoliation, only the tip tender leaves remain, the diseased leaves become smaller, and the pods of the diseased plants are greatly reduced. 2. Prevention and control measures (1) clean the countryside. Timely removal of the diseased body after harvest, concentrated burning or deep burial, and timely removal of diseased leaves at the initial stage of the disease can reduce the spread of the disease. (2) strengthen field management. Properly close planting to make the field ventilated and transparent to prevent excessive humidity. Increasing the application of phosphorus and potassium fertilizer can improve the resistance of the plant. (3) Pesticide control. For timely spraying and prevention in the early stage of the disease, 50% carbendazim wettable powder 500 times solution, 75% methyl topiramate wettable powder 800 times solution, 65% Dysen zinc wettable powder 600 times solution, 14% Luoammonia copper water agent 400 times solution, sprayed every 7 to 10 days, 2 times 3 times in a row. 2. Identification and prevention of epidemic disease 1. Symptoms: it mainly harms stems, leaves and pods, mostly in or near stem nodes, especially near the ground. At the beginning of the disease, the disease showed a water stain, then wet rot and shrinkage around the stem, and the leaves above the disease withered and died. When the humidity was high, the cortex rotted and the leaves infected with white mildew showed dark green water stains at first, then enlarged into round light brown spots and produced white mold on the surface. The disease department of the pod is also mildew and rotten. 2. Control measures (1) selection of disease-resistant varieties. (2) implement crop rotation. Select sandy loam soil with good drainage, adopt high border and deep ditch, reasonably close planting, make it ventilated and transparent, and pay attention to timely drainage after rain. (3) Pesticide control. Timely spray protection in the early stage of the disease, 58% Redomir manganese zinc wettable powder 500 times liquid, 64% poison alum wettable powder 500 times liquid, 72.2% Pulic water agent 800 times liquid, sprayed once every 7 to 10 days, 2 times in a row for 3 times, the effect is good. Click to get more bean planting techniques click to get more vegetable planting techniques