Pest control methods of pear net bug

This insect, also known as military worms, gathers the dorsal thorns and suck juice in the leaves of adults and nymphs, so that the affected leaves are densely covered with white spots, and even the whole leaves are pale, causing early defoliation, affecting tree development and flower bud formation, and in serious cases, blooming twice in the autumn of the same year, causing damage to the yield of the second year. This insect has miscellaneous feeding habits and can harm many kinds of fruit trees, such as pear, apple, scarlet, begonia, peach, cherry, Hawthorn, jujube and so on.

[occurrence regularity] there are 4-5 generations a year. The overwintering adults began to lay eggs in mid-April, and the egg period was 10-15 days. The first generation nymphs occurred one after another in early May and flourished in the middle of May. The later generations of nymphs appeared in mid-late June, early-middle August and early-mid-September, and the adults migrated and overwintered from mid-late October. The occurrence algebra of this insect is more, the host of each generation is complex, and the phenomenon of co-overlap in the field is serious. The long-term dry weather is beneficial to the reproduction of this insect.

[control methods] (1) thoroughly sweep the litter and weeds in the garden in winter, burn them centrally and eliminate the overwintering adults. (2) if you master the situation of insects, you will cure them early. ① pays close attention to overwintering generation control, and soil disinfection is carried out in late March or early April before overwintering adults are active, which has a significant effect on killing overwintering adults. The nymphs of each generation of ② should be sprayed in time at the initial stage of nymph occurrence, especially the initial stage of the third and fourth generation nymphs. The agent can be used with 80% dichlorvos emulsion 8-1000 times, or 50% parathion emulsion 1000 times, or 20% fenvalerate emulsion 2000 times, preferably 2-3 times continuously. When spraying, pay attention to encirclement and annihilation, avoid leakage, and act at the same time to prevent relocation.