毛竹黑叶蜂对毛竹生长的影响及防治

毛竹黑叶蜂是竹子的重要害虫,以幼虫取食竹叶。观察发现,危害指数大于60时,明显影响下度新竹质量,眉围平均下降6.7％～12.9％.用2.5％溴氰菊酯(5000倍)、25％菊乐合酯(3000倍)和40％敌敌畏(2000倍)农药喷杀幼虫,杀虫率分别可达95.7％,91.7％和100％;用50％甲胺磷原液(1.5ml/株)进行竹腔注射,杀虫率也可达98.7％.在生产上大面积推广以后,能控制新竹眉围的下降,取得了明显的效果。

Influnce of Eutomostethus nigritus Xiao on the Growth of Moso Bamboo and Its Control

Eutomostethus nigritus Xiao is a major destructive insect of moso bamboo, and its larva live by eating bamboo leaves. The investigative results showed that the quality of new bamboos formed next year was affected obviously when the harm index was over 60, and the mean girth of brow height had a reduction of 6.7 per cent to 12.9 per cent. The killing rate could raches 95.7 per cent, 91.7 per cent and 100.0 per cent respectively by spraying insectisides of 0.0005 per cent deltamethrin, 0.0083 per cent fenvalerate dimethoate and 0.02 per cent dichlorvos on the larva of Eutomostethus nigritus Xiao. In addition, the killing rate could also rache 98.7 per cent by injecting 50 per cent tamaron (1.5 ml/plant) into bamboo cavity. It has achieved an outstanding result on bringing the reduction of girth of brow height under control since the above mentioned measures were taken.