I. Classification of mites and viral diseases The mites are generally parasitic on the back of the leaves of vegetables. The leaves of the young leaves are damaged, the leaves become smaller and the color is thicker, the texture becomes harder, thick and brittle, and the plants grow poorly. The leaf margin of the damaged young leaves is generally rolled up, showing a deformity, pale leaves, and bright veins.
After confirming that the vegetables are harmed by mites, 73% of Kruth emulsifiable concentrate 400-500 mg / liter, 5% of dead gram milk 667-1000 mg / liter spray can be used for prevention and treatment; it is confirmed that after the virus disease is caused, it can be used to treat insects ( Such as aphids, whitefly, etc.) on the basis of disease prevention, use 20% of virus A wettable powder 1000 mg / liter plus carapace 3300 mg / liter or 0.5% of phytopathogenic emulsion 1000 mg / liter plus Kang Debao plant Nutrient 1000-1667 mg / liter solution spray control.
2. Distinction between nematodes and bacterial wilt and blight. Bacterial wilt, blight and nematodes can cause the diseased vegetable plants to wilting, but the former two are infectious diseases. After the plants are damaged, the vascular bundles gradually become brown, and the damage is early. It swells at noon, returns to normal in the morning and evening, and continues to languish in the later period. The diseased stem is longitudinally cut and placed in a clear glass containing clear water. If the mucus overflows, it is a bacterial wilt. If there is no mucus overflow and the lower leaves of the plant turn yellow, it is wilt. In the early stage of nematode damage, the aboveground plants are poorly grown, the leaves are smaller than the leaves of normal plants, and the roots are reduced. Some nematodes can form "beaded" tumors on the fibrous roots; some nematodes are at the junction of the main roots and lateral roots. Cortical foraging causes damage to the cortical tissue.
Vegetables with serious wilt disease, such as cucumber and watermelon, can be grafted and controlled with black seed pumpkin and vegetable gourd; after the occurrence of bacterial wilt, it is necessary to reduce the humidity in the field and avoid flood irrigation. 77% of the plants can be killed. Wettable powder or 25% Qingchangling wettable powder 1667-2500 mg / liter solution, 200 grams per plant; nematodes can be controlled with 10% anti-line spirit (green collecting treasure).
After confirming that the vegetables are harmed by mites, 73% of Kruth emulsifiable concentrate 400-500 mg / liter, 5% of dead gram milk 667-1000 mg / liter spray can be used for prevention and treatment; it is confirmed that after the virus disease is caused, it can be used to treat insects ( Such as aphids, whitefly, etc.) on the basis of disease prevention, use 20% of virus A wettable powder 1000 mg / liter plus carapace 3300 mg / liter or 0.5% of phytopathogenic emulsion 1000 mg / liter plus Kang Debao plant Nutrient 1000-1667 mg / liter solution spray control.
2. Distinction between nematodes and bacterial wilt and blight. Bacterial wilt, blight and nematodes can cause the diseased vegetable plants to wilting, but the former two are infectious diseases. After the plants are damaged, the vascular bundles gradually become brown, and the damage is early. It swells at noon, returns to normal in the morning and evening, and continues to languish in the later period. The diseased stem is longitudinally cut and placed in a clear glass containing clear water. If the mucus overflows, it is a bacterial wilt. If there is no mucus overflow and the lower leaves of the plant turn yellow, it is wilt. In the early stage of nematode damage, the aboveground plants are poorly grown, the leaves are smaller than the leaves of normal plants, and the roots are reduced. Some nematodes can form "beaded" tumors on the fibrous roots; some nematodes are at the junction of the main roots and lateral roots. Cortical foraging causes damage to the cortical tissue.
Vegetables with serious wilt disease, such as cucumber and watermelon, can be grafted and controlled with black seed pumpkin and vegetable gourd; after the occurrence of bacterial wilt, it is necessary to reduce the humidity in the field and avoid flood irrigation. 77% of the plants can be killed. Wettable powder or 25% Qingchangling wettable powder 1667-2500 mg / liter solution, 200 grams per plant; nematodes can be controlled with 10% anti-line spirit (green collecting treasure).
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