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Prevention and control technology of broad bean red spot disease
Broad bean red spot disease is a fungal disease, which is heavier in poorly drained or low-potassium fields. In case of rainy days, the humidity is large and the development is very fast. There are also lesions on the leaves, severe stems, flowers and young pods. The damaged leaves begin to have small red spots with large needles. The back of the leaves is more, gradually expanding into a round or elliptical shape, slightly concave in the middle, light color, purple purple at the edges, slightly raised, and a clear boundary with the health. Under the conditions, there are gray mold on the lesion. When the disease is serious, all parts of the diseased plant, including the flowers, become black, the leaves are lighted, and finally the whole plant is dead.
Prevention and treatment method
1. Mainly pay attention to reasonable close planting, open up drainage irrigation ditch in the field, and increase potassium fertilizer.
2, chemical control, can be sprayed 3 times with 1% Bordeaux mixture, each time interval of 7 days; or use anti-virus cockroach, keering, metalaxyl manganese zinc and other three kinds of agents, choose 1:800 times The liquid is sprayed evenly, and it is sprayed once every 15 days, and sprayed continuously for 3-5 times, which can greatly reduce the disease.
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