贺氏线盾蚧发生规律及综合管理技术研究

1990～ 1994年在赤壁市官塘林场对贺氏线盾蚧 (KuwanaspishowardiCooley)的研究结果表明 :该虫在我省 1a发生 2代为主 ,少数 1a 1代和 1a 3代。大部分以第 2代受精雌成虫越冬 ,小部分以第 1代雌成虫、第3代 1龄若虫和雌性 2龄若虫越冬。其天敌主要有草蛉、寄生蜂、寄生真菌等。该虫主要发生于北坡、山脚、密林及 6a生以上老竹 ,立竹 3m以下虫口达 93 3%。 5月下旬第 1代若虫孵化高峰期 ,采用 2 0 %敌杀死喷杆、4 0 %乐果注干、3%呋喃丹根施 ,防治效果分别达 79 2 %、85 7%和 93 1% ,但由于若虫孵化期较长 ,竹林整体防效并不明显。通过疏伐虫害竹、抚育清林 ,竹林虫口密度由 10 0头·(10 0cm2 ) - 1 降为 1 4 5头·(10 0cm2 ) - 1 。对严重受害竹林 ,采取强度采伐虫竹、全垦抽槽、压青施肥 ,虫口密度降幅达 97 0 % ,新竹胸径平均增加 1 3cm ,取得了较好的综合管理效果。

STUDIES ON OCCURRING REGULARITY AND INTEGRATED MANAGEMENT OF KUWANASPIS HOWARDI COOLEY

The occurring regularity and integrated management of the scale\|insect, Kuwanaspis howardi Cooley,were studied on Guantang Forest Farm of Chibi,Hubei Province from 1990 to 1994.The results showed that most of the pest had two generations,and a few one or three generations during a year.The winter was passed by most of the second\|generation pregnant adult female and a few by the first generation adult female or the 1st\|instar larva or 2nd\|instar female larva of the third generation.The main natural enemies were some of the lacewings,parasitic wasps,fungi and mites.The insect mainly occurred at the foot of mountains,northern slopes and in thick bamboo forestlands,especially on the six years old bamboos,on which the scale insect was found on 93.3% of the trunks below 3 metres. When the incubation of the first generation adults was in boom in the last ten days of May,the control effect against it could respectively reach 79.2%,85.75%,93 1% by spraying trunks with 20% deltamethrin emulsion,injecting trunks with 40% dimethoate emulsified oil and pouring roots with 3% granulated carbofuran,but the incubation of adult was long,the control effect of the bamboo forest was not obvious.The good effect of control was achieved by thinning,cultivating and cleaning the damaged bamboo forest with the pest density declining to 1.45 heads from 100 heads per 100 quarter centimeters,and by strongly lumbering bamboos seriously injuried by the insect,fully reclaiming and cutting snotches,and applying fertilizer by burying green litters with the pest density decreasing by 97.0%,and the mean diameter of renewing bamboos increased by 1.3 centimeters.