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Effects of Three Insect Growth Regulators, Feeding Substrates, and Colony Origin on Survival and Presoldier Production of the Formosan Subterranean Termite (Isoptera: Rhinotermitidae)

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Abstract:

Effects of three insect growth regulators (IGR's)-methoprene, fenoxycarb (Ro13-5223), and 2-[p-m-(Flurophenoxy) phenoxyI ethyl ethylcarbamate (Ro16-1295)-at ca. 500, 1,000, and 1,500 ppm on three feeding substrates-filter paper, absorbent pure cellulose filter pads, and ponderosa pine (Pinus ponderosa Dougl. ex Laws) blocks-were evaluated on laboratory experimental groups of 150 Coptotermes formosanus Shiraki (130 workers and 20 soldiers) collected from three field colonies in Oahu, Hawaii. Ro16-1295 killed ca. 16% workers while only ca. 2% of workers died after 2-weeks exposure to methoprene and fenoxycarb. A considerably larger proportion of soldiers was killed as a result of exposure to these IGR's; ca. 25% were killed by methoprene and ca. 40% were killed by the other IGR's. All three IGR's induced presoldier formation. Approximately 12-22 presoldiers were found in treated groups after 2 weeks, while no presoldiers were observed in untreated controls. Feeding substrates did not affect worker mortality. However, IGR-impregnated pine blocks caused significantly lower soldier mortality and produced more presoldiers than the other two substrates. All three colonies were significantly different from each other in worker and soldier mortality and presoldier production in response to IGR's and feeding substrates.

Document Type: Research Article

Publication date: December 1, 1985

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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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