Abstract

Investigations were undertaken for a better understanding of seasonality, interaction with tea ecosystem, and parasitic impact of an endoparasitoid Cotesia ruficrus (Haliday) (Hymenoptera: Braconidae) on the destructive tea looper Hyposidra talaca (Walker) (Lepidoptera: Geometridae). The population abundance of C. ruficrus was noticed as high in the months of pre-winter and spring seasons which was coincided with the population increase of H. talaca. C. ruficrus found to foraging and collecting nectar from the flowers of Lantana camera L., Moringa oleifera Lam., and Clerodendron infortunatum L. associated with the tea ecosystem. The life table parameters including intrinsic rate of natural increase (r_m) and net reproductive rate (Ro) of C. ruficrus were 0.203 per day and 41.11 female offspring/female, respectively, with the gross reproductive rate (∑mx) 50.09 eggs/female. The parasitic impact of C. ruficrus has significantly affected the food consumption and development of H. talaca. Resultantly, a drastic reduction in body weight, changes in differential hemocyte count (DHC), and morphology of hemocytes were observed in parasitized host larvae. Toxic effect of quinalphos and thiamethoxam on C. ruficrus showed 100% mortality followed by bifenthrin > deltamethrin > emamectin benzoate > flubendiamide > fenpyroxymate after 72 h of the application.

摘要

为了更好地了解季节性、与茶叶生态系统的相互作用以及内寄生蜂Cotesia ruficrus (Haliday)（膜翅目：茧蜂科）对破坏性茶尺蠖Hyposidra talaca（Walker）（鳞翅目：尺蛾科）的寄生影响，进行了调查。在冬季前和春季的几个月里， C. ruficrus的种群丰度很高，这与H. talaca的种群数量增加同时发生。C. ruficrus被发现从马缨丹、辣木和Clerodendron infortunatum的花朵中采集花蜜L.与茶生态系统相关。红鹳内在自然增长率（r _m）和净繁殖率（Ro）等生命表参数分别为0.203/日、41.11雌子/雌，总繁殖率（Σmx）为50.09卵/雌。女性。C. ruficrus的寄生影响显着影响了H. talaca的食物消耗和发育。结果，在寄生的宿主幼虫中观察到体重急剧下降、血细胞分类计数（DHC）和血细胞形态的变化。喹磷和噻虫嗪对红线虫的毒害作用施用 72 小时后，死亡率为 100%，依次为联苯菊酯 > 溴氰菊酯 > 甲维盐 > 氟虫酰胺 > 芬吡酯。