Sublethal Effects of Flufenoxuron and Lufenuron on Life Table Parameters of Habrobracon hebetor (Hymenoptera: Braconidae)

Sublethal effects of two juvenile hormone analogue, flufenoxuron and lufenuron, were evaluated on larval, pupal and adult stages of Habrobracon hebetor Say under laboratory conditions. Dose-response bioassays were carried out on the insect’s immature and adult stages through dipping and contact residue methods. In the sublethal effect tests, field rates (500 ppm) of the two insecticides were employed. In sublethal effect tests, mean longevity and fecundity showed no significant differences between flufenoxuron (27.8±1.4 d and 434.5±30.7 eggs) and lufenuron (27.3±2.2 d and 316.9±34.6 eggs) as compared with control (28.3±2.4 d and 390.7±52.9 eggs). However, net reproductive rate and intrinsic rate of increase indicated significant differences between flufenoxuron (282.5±19.9 and 0.286±0.006) and lufenuron (209.3±22.9 and 0.263±0.01) as compared with control (177.3±24 and 0.260±0.008). In summary it can be concluded that both flufenoxuron and lufenuron exerted little negative effects on H. hebetor. However, negative effect of Flufenoxuron on intrinsic rate of increase (rm) was recorded lower than that in lufenuron.