Summer cabbage to prevent virus disease
Virus disease is one of the most important diseases of summer cabbage. In general, the yellowing and shrinking of the heart during seedling stage can not support the balling. In the adult stage, the diseased leaves are brittle, crumpled, and the heart is not true, and gray-brown patches are formed on the leaves, which affects the yield and the commodity.
Cabbage virus disease mainly depends on the poisonous locusts and leaves rubbing the juice to transmit the virus. High temperature and drought, especially under high night temperature conditions, are weak conditions and are important external conditions for infection. Before the 7th leaf stage, it was the period most susceptible to the virus and caused the most serious harm. Its prevention and control methods are:
Diligent watering does not seedlings
Adhere to the principle of “three waters, five waters, and five watersâ€. In the future, once every 2 to 3 days, pour water once and promote it in the end. The watering time should be divided into the best in the evening, reduce the night temperature, reduce the respiratory consumption, and ensure the vegetable strain. Robust growth.
Nitrogen-enhanced potassium-enhanced potassium promotes strong seedlings
One-time application of base fertilizer is sufficient to apply 5 kg of bio-potash fertilizer, 50 kg of potassium sulfate compound fertilizer, and 15 to 20 kg of ammonium bicarbonate to Mushi.
Timely cure and eliminate the source of poison
The locusts were found to be immediately sprayed and prevented. They should be controlled once every 3 to 5 days during the migration of the winged beak. They can be sprayed with 20% Chrysanthemum EC 800 to 1000 times or 20% cyanide WP 800 times. Adding 0.3% potassium dihydrogen phosphate at the time of spraying can improve the efficacy and enhance the disease resistance of the vegetable strain.
The central disease strain should be removed immediately
Found that the central disease strain should be immediately removed to prevent infection, and spraying A500 times the virus or plant disease spirit 500 to 800 times the liquid for prevention and treatment.
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