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Effects of Oxygen, Carbon Dioxide, and Temperature on the Mortality Responses of Epiphyas postvittana (Lepidoptera: Tortricidae)

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Abstract:

First-instar light brown apple moths, Epiphyas postvittana (Walker), were exposed to various controlled-atmosphere treatments at different temperatures. The time required for 99% mortality (LT••) was highly dependent on the concentration of 0, and temperature; insects died more rapidly with lower concentrations of O, and with higher temperatures. The effect of different concentrations of CO, on mortality of first instars was less pronounced. At 2O"C and an 0, concentration of 0.4%, a CO, concentration of 5.0% resulted in lowest LT•• (mean of 22.5 h) of all of the CO, concentrations tested. Using this atmosphere (i.e., 0.4% 0" 5.0% CO,), we determined mortality of third instars, fifth instars, and eggs of E. postvtttana at 20 and 300c. At both temperatures, LTgos decreased in the following order: fifth instar > third instar "o" eggs > first instar. An experiment testing this atmosphere at 40"C on fifth instars gave a mean LT•• of 4.2 h.

Document Type: Research Article

Publication date: October 1, 1991

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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