The larvae feed on the underground part of the leeks and the tender stems. When the damage is light, the plants wilted and break off the leaves. When the damage is heavy, the plants die. Five generations of crickets occurred in Xuzhou City in one year. Winter larvae lived in the soil surrounding the roots of leeks, and they were also harmful in winter in protected areas. In late March, the peak period of overwintering adults emerged. When the ground temperature stabilizes above 12°C in the spring, the earthworms begin to harm. In the middle and early April, it is the peak period of the first generation of earthworms, and prevention and control work should be done. Agricultural control of dried leeks before the removal of dead leaves and weeds in the field, and open the topsoil around the roots, so that the earthworms exposed to the surface of the natural death. The application of planting wood ash before covering the soil can not only control cockroaches, but also can supplement potassium and promote the robust growth of chive. Chemical control prevents and controls adult worms and sprays pyrethroid lipids during the eclosion period of adult worms. The best application is at 9-11 a.m., and once every 5 days. Control larvae, in the peak period of young larvae (5-8 days after the emergence of adult emergence) application of avermectin, matrine, phoxim, chlorpyrifos and other drugs along the ridge irrigation. First open up the topsoil near the roots of the leeks, remove the nozzle of the sprayer and aim the spray at the roots, and cover the soil after spraying. Application safety interval is 10 days. Before sowing leek, the soaking of the above-mentioned root-impregnated chemicals can kill the larvae of the seedlings. It is forbidden to use highly toxic pesticides such as carbofuran, phorate (3911), aldicarb, and parathion (1605).
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