As the humidity in the shed increases, the disease begins to increase, and some wet diseases become more serious. For vegetable farmers, the prevention of fruit diseases such as gray mold, cotton blight and bacterial spot disease should be focused on.
Gray mold is suitable for low temperature and high humidity environment. It is easy to develop under the condition of temperature of about 20 °C and relative humidity of more than 90%. Leaves, stems, inflorescences and fruits can be infected with pathogens. The above affected parts are sparse to dense gray or gray-brown mildew when the humidity is high.
The cotton blight is mainly harmful to the fruit. Any part of the fruit can be infected. It can produce smooth, light-colored, inhomogeneous or near-circular lesions on the near-shoulder or fruit umbilical or fruit surface, which rapidly spread to the periphery, and some appear dark or light. The wheel pattern, after the diseased part spreads to most or the whole fruit surface, the flesh rots and browns, and the diseased fruit is easy to fall off.
Bacterial spot disease, also known as bacterial leaf spot disease, is most severely affected by leaf margins and immature fruits. The leaves are infected, producing dark brown to black spots, often with a yellow halo around them. The young green fruit is infected with a dark brown small dot, which is scattered on the fruit surface, slightly higher than the peel, but the center is not sunken. When the fruit turns red, the small green spots on the fruit surface do not turn red.
On the basis of doing a good job of ventilation and dehumidification in the shed, the method of prevention and control should also spray pesticides in time to prevent disease. The prevention of diseases can be selected 500 times of chlorothalonil, 500 times of succinated calcium sulphate, etc., and has good control effect. When the disease occurs, you can choose targeted drugs, such as gray mold can be used Kaiser, chlorpheniramine, flavonoids, etc.; cotton blight can be controlled with cyanosin, dimethomorph, etc.; bacterial rash can be used Prevention and treatment of copper thiabium, copper quinoline, zinc thiazole and the like.
When spraying, foliar fertilizers such as chitin and amino acids can improve the resistance of the leaves and reduce the incidence.
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