Sublethal impact of paraquat on the life span and parasitic behavior ofDiaeretiella rapaeM’Intosh

Abstract

This study focuses on assessing the impact of sublethal doses of paraquat on the survival, the emergence, the life span and the parasitic behavior of Diaeretiella rapae M'Intosh (Hymenoptera: Braconidae). The impact of sublethal doses was measured at room temperature using different densities of the cabbage aphid Brevicoryne brassicae. The results reveal that the field dose of paraquat caused 100% mortality in D. rapae. The percentage emergence of D. rapae decreased from 80.5% in the control group to 71.5% when treated with the lowest concentration of paraquat. Similarly, the life span of parasitoids that emerged from the mummy treated with paraquat also decreased significantly. Oviposition capability and ovipositor thrusting frequency of D. rapae also treated with sublethal dose paraquat decreased significantly along with a shortened patch residence time in the foraging area.

The effect of Paraquat Dichloride application on diversity and abundance of soil arthropods in the corn field

“…In non-target insects, Cousins et al [9] reported the decreasing size of oenocytes of honeybee larvae after being exposed to very small concentrations of paraquat. Studies related to insect physiology also show that paraquat can decrease the number of the emergence of adult insects 3Bio Journal of Biological Science, Technology and Management 2(1): 1-6 Anggraeni et al and compromise the ovipositioning ability of a parasitoid wasp, Diaeretiella rapae [10]. More than 95% of herbicide use is exposed to water, plants and non-target organisms such as soil arthropods [11].…”