用药棉球塞孔杀桑天牛幼虫桑天牛是桑树主要害虫之一。成虫产卵时，常在产卵处把桑树皮层咬破成一指甲形状伤痕，产一卵在伤痕中间。成虫也咬食桑条皮层，若桑条四周皮层被咬食成环形，枝条即枯萎死亡。孵化后的幼虫，即在枝条中心向下蛀食，直至根部。受害桑树，往往生长... Medication cotton ball plug hole to kill mulberry day larva mulberry day mulberry is one of the main pests. Adult spawning, often at the spawning mulberry bark crashed into a nail shape scars, eggs produced in the middle of a scar. Adults also bite eating mulberry cortex, if the mulberry cortex is bite around the ring, the branches that withered death. After hatching larvae, that is, in the center of the branches eaten down to the roots. Victims of mulberry trees tend to grow ...