Abstract
AbstractMethods to trace source habitats and movement of parasitic natural enemies in agroecosystems are limited. This study demonstrates that stable carbon isotope analysis offers a valuable new method for revealing the movement of Microplitis mediator (Haliday) (Hymenoptera: Braconidae), a larval endoparasitoid of Helicoverpa armigera Hübner (Lepidoptera: Noctuidae), between C3 and C4 plants. Results indicate that M. mediator with δ13C values of lower than −22‰ originate from a C3 plant, whereas those with δ13C values of higher than −19‰ develop on a C4 plant.
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