The two-leaf spiders of grapes are mainly adults and nymphs that harm grape leaves and suck juice. The worms occur from 2 to 3 generations a year, and adults, larvae, and nymphs are harmed by sucking mouthparts. In autumn, the density of larvae is the largest, and the damage is the most serious. After the autumn cool, the adults gradually lurk over winter. Poorly ventilated, densely enclosed vineyards with severe temperatures occur severely.
According to experience, the nymph stage is the best time for drug use, and the best drug control effect is in the first generation of nymphs. In the nymphal stage of emergence, before the first generation of adults has appeared, spray 4% omethoate 1500 times, or 50% kill pinenut oil 2000 times, or 20% quick kill butyl chlorate 2500 times, or 80% acetyl Methamidophos WP 2000 times, under normal circumstances, once the drug can achieve control effect.
If you miss the opportunity to control the nymphs, and adults are particularly paralyzed, you can use an agent that has the functions of smoke killing, contact killing, and stomach poisoning in the evening, such as Anmin + Dichlorvos. Every 5 to 7 days before spraying again, generally control the damage of the whole year. The recommended formula is: 40% An Minle EC 1500 times + 50% Dichlorvos EC 1000 times + Soft water pass 3000 ~ 4000 times mixture. However, it should be noted that this medication must be sprayed on trees and on the ground at the same time.
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