核桃草履蚧壳虫对核桃树危害很大,它用长嘴刺入树皮吸食树液,使被害树不能适时发叶,叶片小而发黄,枝梢干枯,果实长不大,甚至会造成大量落果,使产量大大下降,严重的整树不发叶,干枯死亡。核桃草履蚧壳虫软背无壳,一年一代,以卵在石缝、鼠洞、土块或落叶下越冬。阳坡林地在12月下旬到1月上旬孵化,背阴坡延至1月下旬至2月上旬。孵出的椭圆形小若虫成群结队地上树为害。雌虫扁平椭圆形,体背淡灰紫色,外围淡黄色,头胸呈龟甲状, Walnut grass caterpillar scale insects on the walnut tree is very harmful, it uses long-billed pierced the bark sucking tree liquid so that the victim can not leaf timely leaves, small and yellow leaves, shoots dry, fruit grow up, or even cause A large number of fruit drop, so that production dropped significantly, the serious whole tree does not leaf, dry death. Walnut grass scale insects soft back without shell, a year, with eggs in stone crevices, rat holes, clods or fallen leaves. Sunny slope woodland in late December to early January hatch, shady slope extended from late January to early February. Hatched oval small nymphs in groups dangling tree damage. Female flat oval, light gray purple body, the outer light yellow, turtle head and chest,