Laboratory Evaluation of High Temperatures to Control Cryptotermes brevis (Isoptera: Kalotermitidae)
Authors: WOODROW, R. J.; GRACE, J. K.
Source: Journal of Economic Entomology, Volume 91, Number 4, August 1998 , pp. 905-909(5)
Publisher: Entomological Society of America
Abstract:Rates of thermal increase as low as 0.04°C/ min were measured in large wooden members during high-temperature termite control treatments. It was hypothesized that slow rates of thermal increase might promote termite acclimation to high-treatment temperatures. However, in laboratory studies, 46 and 49°C core temperatures were 100% lethal to Cryptotermes brevis (Walker) nymphs in wooden blocks (13.5 by 13.5 cm) in both 30- and 60-min exposures, whereas equal durations at 46°C were between 30 and 70% effective in 8.5 by 8.5- cm blocks. Rates of temperature increase were slower in larger blocks and were correlated positively with observed thermal tolerance. The negative effect of low rates of increase may be the result of the cumulative effects of sublethal stresses. It was concluded that the commercially recommended target wood-core temperature of54.4°C is sufficient for controlling C. brevis in large timbers. However, priority should be given to achieving lethal temperatures in worst-case areas as opposed to increasing treatment temperatures because higher temperatures may not result in better control and may increase the risk of heat damage to property within the treated structure.
Document Type: Research Article
Publication date: August 1, 1998
- 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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