1, symptoms
Kidney bean mycoplasmosis, also known as cowpea leaf mould, is mainly harmful to the leaves. In the early stage of disease, there are red or purple-brown spots on both sides of the leaves. After enlargement, it is nearly circular light brown or brown, and the boundary between diseased and healthy parts is not obvious. The lesion diameter is 1 to 2 cm. Under wet conditions, the diseased leaf spot on the back of the head is grayish black mold, which causes severe defoliation.
2. Incidence conditions
The growth temperature range of pathogenic bacteria is 7-35 degrees, and the optimum growth temperature is 30 degrees. High temperature, high humidity, and rain are the main conditions for the onset of disease. Continuous cropping and late sowing are more serious.
3, control methods
(1) Strengthen field management
Apply more organic fertilizer, increase phosphorus and potash fertilizer, timely sowing, reasonable watering, timely drainage after rain, timely remove old diseased leaves, remove diseased bodies after the harvest and burn them, and perform deep soiling.
(2) Chemical control
After onset, use 64% antivirus WP 600 times; 77% WP 500 times; 70% Mancozeb WP wet 600 times; spray every 10 days, even spray 2-3 Times.
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