天牛为三湖柑桔上主要害虫,较常见的有褐天牛和星天牛两种,尤以褐天牛较多。每年在清明谷雨边即普遍出现成虫产卵,自3月到7月止,直为它的产卵期,以3、4月最盛。褐天牛卵黄白色,比米粒稍小,每次产卵一对,在树干表皮缝穴处。星天牛每次产卵一枚,较褐天牛卵稍尖,产在树皮上。 Celastrus is the main pest on the Three Lakes Citrus. There are two kinds of brown beetles and cerambycidae, which are more common, especially the brown beetles. Every year in the Ching Ming Valley rain that adult eggs occur generally, from March to July, until its spawning period, the most prosperous in March and April. Brown Tianbaishuang white, slightly smaller than the grain, each pair of spawning, stitches in the trunk epidermal Department. Aesculus spawn a time, slightly more than brown eggs, produced in the bark.