蛴螬,又名土白蚕,是金龟子幼虫的总称.体为乳白色或略带灰色,头部黄褐色,体肥,常弯曲成C字形,无腹足,有胸足3对.主要为害嫩苗幼树的根和地表下的茎部,能严重影响苗木的正常生长.危害“三杉”的蛴螬是淡绿金龟子和黑绒金龟子的幼虫.黑绒金龟子又称东方金龟子、天鹅绒金龟子、土名黑壳虫、 Scabies, also known as native white silkworm, is a general term for beetle larvae body is milky white or slightly gray, head brown, body fat, often curved into a C-shape, no gastropod, there are three pairs of chest and foot. Saplings of roots and subsurface stems, can seriously affect the normal growth of seedlings. Hazard “Sanshao ” is a larva of light green chafer and black velvet beetle, also known as oriental chafer, velvet beetle, soil Black shell insect,