Control methods of jujube gall midge pests

This insect is commonly known as jujube leaf maggot, distributed in all jujube areas of the country, damaging young leaves, buds and young fruits of jujube trees with larvae. Young leaves were affected by cylindrical curl, package purple, hard brittle, soon black withered. After the flower bud is killed, it cannot open and wither and fall off. The young fruit is not affected by proper growth, like soybean size, it turns yellow and falls off, threatening jujube trees greatly. [10] The population is estimated to have about 4 generations per year. The larvae overwinter as cocoons on the surface of the soil or in the soil crevices at the base of the trunk. Adults lay eggs in the first and middle of April, larvae harm young leaves in the first and middle of April, larvae mature in early May and pupate in soil. The second generation larvae appear in the middle and late May, damaging flower buds and tender leaves. Because this generation larva harms jujube organ differently, causes the adult to develop irregularly, causes the generation overlapping. The larvae of the second generation appeared in early July and early and middle August, and damaged jujube fruit. [Control methods](1) From April to August, spraying timely to protect new leaves and fruits during the adult development stage and the initial stage of larval damage of each generation. The medicament can be prepared by 500 times solution of 30% acephate emulsion or 1000 times solution of 80% dichlorvos emulsion. (2) Ground application in late March or early April. (3) Deep soil ploughing in jujube garden in winter.