棉珠蚧(Neomargar-odes gossypii Yang)60年代后期陆续在河北邢台,山东德州、菏泽、聊城,河南洛阳等地发生。棉珠蚧寄生棉花根部,能使棉株凋萎或枯死。轻则减产,重则全部毁种。棉珠蚧一年一代,以若虫在土中越冬。害虫集中在寄主植物根部寄生,一般深度在15厘米以上。据观察,5月初越冬的若虫开始脱壳羽化为成虫,雄虫与雌虫交尾后,不久死去。雌虫5月中旬开始 Neomargar-odes gossypii Yang occurred in the late 1960s in Xingtai, Hebei, Shandong, Heze, Liaocheng and Luoyang, Henan. Cotton pachyrhizi parasitic cotton roots, cotton plants wilted or dead. Light is cut, heavy all destroyed species. Cotton pearl one year generation, nymphs in the soil overwintering. Pests concentrated in the host plant parasites, the general depth of 15 cm or more. It is observed that in early May overwintering nymphs begin to emerge into adult mollusks, males and females after mating, and soon died. The female begins in mid-May