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Sublethal impact of paraquat on the life span and parasitic behavior of Diaeretiella rapae M
Author
Rui Xu, Peter E. Mortimer, Rong Ping Kuang, Jun He, Wu Di Zhang and Fang Yin
Year
2013
Journal Title
Journal of Environmental Science and Health, Part B: Pesticides, Food Contaminants, and Agricultural Wastes
Institution
Taylor & Francis
Volume
48
Issue
8
Pages
651-657
Call Number
JA0535-14
Keywords
Toxicity, functional response, herbicide, natural predator, biological control
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.
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