饰棍蓟马的生物学及防治研究

A New Recorded Thrips Dendrothrips ornatus:Its Biology and Control

饰棍蓟马[Dendrothrips Drnatus(Jablonowsky)]是丁香的重要害虫之一,在北京地区一年发生7～9代,以雌成虫在树下表土、枯枝落叶及老树皮缝隙中越冬。次年3月下旬至4月初出蛰的越冬成虫集中在树基部及内膛部分的芽苞上取食,展叶后则在叶片上为害。若虫在叶片的下面、成虫在叶片的上下两面都可取食为害,严重影响植株的生长发育及观赏价值。温暖和比较干燥的环境对其发生为害有利,高温多雨有抑制作用。在越冬成虫出蛰期用10%西维因粉剂、40%氧化乐果乳油和5%氯氰菊酯乳油防治,效果均很好。冬季结合园林清洁扫除枯枝落叶,早春灌水、翻土,可消灭大量越冬成虫。加强水肥管理可提高植株的抗害能力。

Privet thrips,Dendrothrips ornatus(Jablonowsky),is one of the important lilac pests in Beijing.It injures the leaves by nymph feeding on the lower side and adults on both surfaces,Damaged leaves become blanched and fall prematurely,which reduces the ornamantal value of lilac plants.It passes seven to nine generations a year,with females hibernating under the defoliated leaves and surface soil sur- rounding the tree.The population may be inhibited by high temperature and heavy rain.The overwinter- ing adults in spring can be controlled effectively with carbaryl,omethoate or cypermethrin.Cleaning defo- liated leaves in winter is an effective method in reducing overwintering population.Irrigation and fertiliza- tion are recommended for increasing lilac resistance to the thrips.