Research advance on the response of insects to elevated CO2 in China
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Key Words：atmospheric CO2 concentration, Helicoverpa armigera, Aphis gosypii, natural enimies, impacts
Abstract： Increasing concentrations of atmospheric CO2 are predicted to impact both current and future ecosystems, which have been greatly concerned by scientists. Elevated CO2 has a cascading effect on plant and in turn influences the insect and its parasitoid through food chain. In this overview, we reviewed the progress of research on the response of insects (cotton bollworm/ aphids /whitefly and their parasitoids) to elevated CO2 in China. When consuming plants grown under elevated CO2, the fitness of cotton bollworm as leafchewer was decreased because of reduced fecundity, survivorship and developmental rates. However, the abundance of aphid as phloem sap-sucker has been found to respond positively to elevated CO 2 but no significant effect on whitefly population. The performance of predators and parasitoids to elevated CO2 are speciesspecific. Predators and parasitoids may also increase or may be unaffected under elevated CO2. We predicted that more chemical pesticide would be used to control the aphids since more aphid abundance and the control effect decreased of pesticides under elevated CO2.