Experts to control Chinese cabbage whitefly
Chinese cabbage whitefly, sucking mouthparts, adult and nymphs sucking plant juice, the damaged leaves are chlorotic, yellow, wilting, and even the whole plant is dead. At the same time, it will cause a large incidence of coal pollution, causing vegetables to lose their commodity value. China's pesticide network Xiaobian finishing related disease prevention and control materials, for the majority of farmers friends to learn:
Whitefly mites occur more than 10 generations a year. In the north, the winters in the vegetable greenhouses. After the temperature rises in the spring, the temperature gradually spreads to the open fields. The number of insects increases the fastest in July and August. After the temperature drops from October to November, the greenhouses are further turned. Transfer hazardous vegetables.
Chinese cabbage whitefly prevention and treatment methods:
(1) In the process of greenhouse vegetable production, as long as the temperature outside the shed is still suitable for the survival of whitefly, an insect net should be added to prevent the whitefly from entering the shed.
(2) The old fiberboard or cardboard is made into a slat of 1 m×0.2 m, painted with an orange-yellow paint, and then coated with a small amount of butter and a little butter to form a wormwood oil on the slats. The slats are hung between the rows of vegetables. The height of the suspension is the same as the height of the plant. Generally, 35 to 40 pieces are suspended per acre of greenhouses. After 7 to 10 days, the slats are coated with white mites and then coated with wormwood oil.
(3) Use an appropriate amount of sawdust to absorb 80% to 400% of dichlorvos emulsifiable concentrate per acre, and distribute it into 15-20 piles to ignite with dark fire. Smoke is smoked at night, and the greenhouse should be sealed when smoked, usually 2 to 3 times. Once every 7 to 10 days.
(4) Pesticide control, 600-800 times pure, acetamiprid, 0.30% (matrine), thiamethoxam, nitenpyram, chrysanthemum emulsifiable concentrate, cyanide zinc emulsifiable concentrate, chlorpyrifos, Nuvide or Uranus.
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