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板栗黑星天牛(Anoplophora leeohiGahae),又名黑天牛,栗农称它的幼虫为“钻壳虫”。此虫以往无详细报道。我们从1983年以来对此虫进行了观察。现将结果整理如下: 一、分布和危害 我省宜溧山区各地都有分布。如张渚、太华、茗岭、横山、西渚、归径,善卷、渚东等地,有虫株率几乎为100％,每树上多者达20多条,少者也有1—2条。 板栗受此虫危害后,一是会使栗树整株衰败、死亡。因为此虫的幼虫在板栗树基部皮层下沿木质部的表面上下左右迂迥蛀食韧皮都和形成层,切断了输导组织,当数头幼虫环绕树干皮下蛀食时,轻者栗树叶发黄,不结实或者虽结实空蒲多;重者叶先枯黄,接着整株枯死。1985年,张渚地区被此虫为害而死的栗树在千株以上。二是可引起栗树木质部腐烂空心。幼虫蛀食在树干皮层留下伤痕,木质部造成蛀道,成虫在树干上留下羽化孔,经雨水侵入,使心材腐烂,再加上蚁
Chestnut Anoplophora leeohiGahae, also known as the black bull, chestnut called its larvae “drill worm.” This worm in the past no detailed report. We have observed this worm since 1983. The results are now organized as follows: First, the distribution and damage Lili Mountain in Shandong Province are distributed throughout. Such as Zhangzhu, Taihua, Mingling, Yokoyama, Nishi Nagisa, Gui Shing, Shan Juan, Houzhu East and other places, the rate of almost 100% of the strains of insects, more than 20 trees per tree, the less there are 1- 2 pieces. Chestnut endangered by the insect, one will make chestnut whole plant decline, death. Because of this insect larvae in the chestnut tree base cortex along the surface of the xylem around the pathogenic bacteria and formation of layers, cut off the guide tissue, when the number of larvae around the trunk of the skin when eating, the light chestnut leaves Yellow, not strong or too solid empty Pudu; heavy first yellow, then the whole plant died. In 1985, more than a thousand chestnut trees were killed in this area by the Zhangzhu area. Second, can cause chestnut trees rotten hollow. Larvae eaten in the trunk cortex left scars, xylem caused by tunnels, adult leaves in the trunk feather hole, intrusion of rain, heartwood decay, coupled with ants