Symptoms: Kidney bean rust is an airborne disease that usually occurs in summer and autumn. The greenhouse provides a good place for wintering and breeding. The disease mainly invaded the leaves. At the beginning, there was a small greenish-looking macule with a small margin. The diameter was about 1 mm, and the posterior middle was slightly raised and dark yellow. After the epidermis ruptured, reddish-brown powder (the pathogenic spores) was released. Generally from April to May, the growth of cowpea in the greenhouse occurs in the middle and later stages, and it is generally not at the seedling stage. In the cowpea flowering stage, the greenhouse temperature is 16～22°C, the temperature difference between day and night is large, and high humidity and dew condensation time spread easily. Continuous disease is heavy. Control methods: 1 Clean the garden, deeply buried diseased bodies, close-packed plants, control the humidity in the shed, and avoid continuous cropping. 2 chemical control. Once a central diseased plant is found, it is immediately sprayed to prevent and control, and the incidence of sheds is the center. It is best to implement the joint prevention and treatment of farmers. Sulfur Suspension and Triadimefon (Triadimefon) are commonly used agents for preventing and treating cowpea rust, but they are prone to phytotoxicity and should be used with caution. In the early stages of disease, the following pesticides are recommended, one of which may be selected: 12.5% ​​speed Poly WP 3,000 to 4,000 times; 40% Fuxing 8000 times; 25% 3,000 ounces of demulsifying oil; 43% Holocyan suspension 3000 ~ 4000 times; 10% World High Water Dispersible Granules 2000 times spray. Pay attention to spray evenly, 7 to 10 days 1, even spray 2 or 3 times. In addition, pay attention to the strict disinfection of the old shed body before uncovering the cowpea pupa, you can use sulphur fumigation.
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