Effects of Ambient Temperature on Egg and Larval Development of the Invasive Emerald Ash Borer (Coleoptera: Buprestidae): Implications for Laboratory Rearing
The emerald ash borer, Agrilus planipennis Fairmaire, an invasive beetle from Asia causing large scale ash (Fraxinus) mortality in North America, has been extremely difficult to rear in the laboratory because of its long life cycle and cryptic nature of immature stages.
This lack of effective laboratory-rearing methods has not only hindered research into its biology and ecology, but also mass production of natural enemies for biological control of this invasive pest. Using sticks from the alternate host plant, Fraxinus uhdei (Wenzig) Lingelsh, we characterized
the stage-specific development time and growth rate of both emerald ash borer eggs and larvae at different constant temperatures (12‐35°C) for the purpose of developing effective laboratory-rearing methods. Results from our study showed that the median time for egg hatching decreased
from 20 d at 20°C to 7 d at 35°C, while no emerald ash borer eggs hatched at 12°C. The developmental time for 50% of emerald ash borer larvae advancing to third, fourth, and J-larval stages at 20°C were 8.3, 9.1, and 12.3 wk, respectively, approximately two times longer than
at 30°C for the corresponding instars or stages. In contrast to 30°C, however, the development times of emerald ash borer larvae advancing to later instars (from oviposition) were significantly increased at 35°C, indicating adverse effects of this high temperature. The optimal
range of ambient temperature to rear emerald ash borer larvae should be between 25‐30°C; however, faster rate of egg and larval development should be expected as temperature increases within this range.
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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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