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Effect of Temperature Establishment Time on the Mortality of Epiphyas postvittana (Lepidoptera: Tortricidae) Larvae Exposed to a High-Temperature Controlled Atmosphere

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Mortality responses of Ist-, 3rd-, and 5th-instar Epiphyas postvittana (Walker) on apples to a controlled atmosphere (1% O2, 1%CO2) with 4 different times (5-12 h) to increase fruit surface temperature from 20°C (temperature during controlled atmosphere establishment) to 40°C (target temperature) were determined. Percentage mortality of all larval stages tested increased linearly on a complementary log-log scale with increase in treatment time. E. postvittana showed a general pattern of life-stage tolerance to treatment of 1st instar ≤3rd instar ≤ 5th instar. For all larval stages, mean lethal time (LT) estimates increased with increasing temperature establishment time. However, almost all insect mortality occurred within the period of temperature establishment. LT50s for all larval stages and LT99s for 1st instars increased less than the increase in temperature establishment time. Increasing the temperature establishment time increased the LT99 estimates of 3rd and 5th instars by an equivalent amount. No mortality estimate of any larval stage increased more than the increase in temperature establishment time.

Document Type: Research Article

Publication date: February 1, 1998

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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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