Pollution-free control of cabbage caterpillar

If long-term use of chemical pesticides to kill cabbage caterpillars will not only kill a large number of natural enemies, but also increase the resistance of cabbage caterpillars. In fact, the use of natural enemies of cabbage caterpillars, through comprehensive control, with appropriate chemical pesticides, can completely control the cabbage worms and produce pollution-free vegetables. The specific control measures are as follows:
(1) Dilute 200 times spray with 250 g of water per acre of bt insecticide.
(2) Spray with 20% Diflubenzuron No. 1 or 25% Diflubenzuron No. 3 1000-2000 times solution.
(3) Control with 0.2% aqueous solution of cabbage larvae. Pick 100 grams of cabbage worms per acre, mash and rot, 250 ml of water, add 50 grams of washing powder, and then spray 50 kg of water, the control effect can reach more than 90%.
(4) Controlling cabbage caterpillars with calcium superphosphate and lime water to avoid eggs. Spraying vegetables with 1-3% lime water or superphosphate solution can avoid more than 52% of eggs in 1 week, and the effect on day 5 can reach 84%.
(5) Using plant drug source control. Take the root bark of bitter tree, wrap it with gauze, shake it on the vegetable plant, use 1.5 kg per acre, and use it once at the peak of egg hatching, which can effectively control the occurrence of cabbage caterpillar.
(6) Artificial pest control. In the winter, the sapphire and the larvae on the bricks and stones on the building are removed within 20 meters around the vegetable field. The cabbage worms and larvae on the leaves of the cabbage-type vegetables are killed in spring, summer and autumn, and the fields are cleaned after harvest.
(7) Protect the natural enemies of spider mites, ladybugs, etc., and artificially release the pink butterfly bee.
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