Effects of Sublethal Doses of Chlorfluazuron on Ovarioles in the Common Cutworm, Spodoptera Litura （F.） （Lepidoptera： Noctuidae）  

作　　者：Farzana Perveen 

机构地区：[1]Laboratory of Applied Entomology, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan

出　　处：《Journal of Life Sciences》2011年第8期609-613,共5页生命科学（英文版）

摘　　要：Chlorfluazuron is an insect growth regulator for controlling the major insect pests in crops. This paper describes the effects of sublethal doses （LD10：1.00 ng/larva; LD30：3.75 ng/larva） of chlorfluazuron on ovarioles during ovarian development and oogenesis of common cutworm, Spodoptera litura （F.）. It is a significant pest of cotton, tobacco and miscellaneous vegetables. The LDlo or LD3o was applied topically to the newly-ecdysed fifth-instars of S. litura under laboratory conditions. In controls, on 2nd day of adult emergence, the cell density in germarium was 1636 ± 9.17 nuclei/mm^2. It increased until 3rd day, i.e., 1829 ± 8.87 nuclei/mm^2 and decreased thereafter. In the LDloor LD-3o-treated insects, the patterns of the cell density was the same as in controls but values were significantly （P 〈 0.05） decreased in the LD10- and more in the LDa0-treated females compared with controls. In control, ovaries were normal type and had mature ova with an occasional one or two being absorbed. In LD10-treated females, ovaries had spaces in ovarioles and absorption of ova. In LD30-treated females, besides the spacing and absorption, sometimes only immature （germarium） ova were found.

关 键 词：CHLORFLUAZURON common cutworm developmental stages OOGENESIS ovarioles Spodoptera litura sublethal doses. 

分 类 号：S435.132[农业科学—农业昆虫与害虫防治] S433.4[农业科学—植物保护]