Cabbage butterfly is known as white butterfly and white butterfly. Its larva is known as cabbage caterpillar and is a national pest. The worm likes cruciferous plants, so cabbage, rape and cabbage are the most seriously affected. Control methods: 1, chemical control. The best period of drug control is before the larvae are three years old. The use of drug killing is the first choice for the control of cabbage caterpillars, and it can also cure aphids. The key is to select high-efficiency, low-toxic, low-residue pesticides. You can choose one of the following medicines for careful and thorough spray control, 90% trichlorfon or 5% 100% or 48% lesbian 1000 times liquid, 45% green Pepsi 1000-1500 times liquid, the effect of drug replacement is more good. 2, combined with fertilizer. The dead leaves, residual plants and weeds in the field will be concentrated or burned to destroy the hidden larvae and pupa. 3, artificial killing of larvae and pupa in the field, net catching adults before spawning.
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