云南木蠹象(Pissodes yunnanensis)生物学特性研究再报

Re-Study on biology of Pissodes yunnanensis (Coleoptera: Curculionidae)

云南木蠹象(Pissodes yunnanensis)是我国西南地区近年来危害云南松的重要蛀干性害虫.室内饲养和林间调查结果显示,云南木蠹象(Pissodes yunnanensis)卵单产或聚产,多数在同一产卵孔内产卵1~2粒,随着虫口密度的增大,聚产的可能性随之增大.产卵孔内卵的数量与成虫密度及林间适宜产卵的枝条数量有关.单雌产卵量因种群不同而有显著差异,平均单雌产卵量为60~90粒.幼虫在不同生长年龄的树枝上的比例与其成虫在这些树枝上的产卵比例大体是一致的,即主要分布在2 a生树枝上.幼虫老熟后在坑道末端化蛹,化蛹部位与树枝粗细密切相关,一般化蛹于木质部与髓部之间,少数在树枝髓部组织内,在韧皮组织较厚的轮枝节间则化蛹于韧皮部与木质部之间.

Pissodes yunnanensis Langor and Zhang is a species of insect pest discovered recently on Yunnan pine(Pinus yunnanensis).Eggs were deposited in egg cavities,where mainly 1～2 years old branches.And eggs laid singly or in clusters of two to more eggs per cavities,and each female normally produced 59 to 91 eggs in total.Rearing indoors and investigating in the fields indicated that the egg number in each cavity was mostly adjusted based on the adult density and the amount of the branches suitable for breeding.G...