北京地区刺槐叶瘿蚊生物学特性及防治

Bionomics and control of Obolodiplosis robiniae in Beijing

刺槐叶瘿蚊Obolodiplosis robiniae(Haldemann)原产北美洲东部,危害刺槐叶片。一般是3～8头幼虫群集危害,在刺槐叶片背面沿叶缘形成纵向卷曲的虫瘿,隐藏其中取食。危害严重时,刺槐树的受害率近100%,极大影响刺槐的健康生长。该虫在北京地区1 a发生5代,以幼虫和蛹在土中越冬。施用10%吡虫啉可湿性粉剂1 000倍液,虫口减退率可达99.1%,4.5%高效氯氰菊酯乳油1 500倍液,虫口减退率为90.5%。在幼虫期发现1种寄生性天敌瘿蚊长腹细蜂Platygster sp.,寄生率93.4%。

Obolodiplosis robiniae（Haldemann）（Diptera：Cecidomyiidae）,native to North America,attacked leaves of Robinia pseudoacacia.The larvae（usually 3-8 individuals） gregariously fed inside the longitudinally rolling gall along the edges of leaf.The attacking rate on black locust trees was about 100% in outbreak.It had 5 generations a year and overwintered as pupa and mature larva in soil.The population reduced by 99.1% and 90.5% when imidacloprid 10% WP 1 000 times and beta-cypermethrin 4.5% EC 1 500 times were applied respectively.Platygster sp.was found as its parasitoid on larva and the parasitization was 93.4%.