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Disodium Octaborate Tetrahydrate Treatments to Slash Pine for Protection Against Formosan Subterranean Termite and Eastern Subterranean Termite (Isoptera: Rhinotermitidae)

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Abstract:

Minimum retentions of disodium octaborate tetrahydrate (DOT) needed in slash pine, Pinus elliottii Engelm. variety elliottii, wood to provide maximum protection against 2 species of subterranean termites were determined in choice and no-choice laboratory tests. Efficacy criteria for DOT were ≥90% termite mortality and ≤5% loss in weight of treated wooden blocks. For termites fed only DOT-treated wood, 0.10 and 0.30% boric acid equivalent (BAE, percentage of boric acid based on dry weight of wood, assuming all boron is present as boric acid) protected wood from the eastern subterranean termite, Reticulitermes flavipes (Kollar), and Formosan subterranean termite, Coptotermes formosanus Shiraki, respectively. When termites had a choice between treated or nontreated wooden blocks, 0.30% BAE protected wood from R. flavipes, but the highest retention tested, 0.54% BAE, was not effective against C. formosanus. In a nonleaching field study where wooden blocks were not in contact with soil or exposed to rain, a BAE of 0.30% protected the wood from naturally occurring Reticulitermes sp. for 18 mo. In wooden structures under constant pressure from subterranean termites, concentrations >0.54% BAE may be required to protect wood, especially against C. formosanus.

Document Type: Research Article

Publication date: June 1, 1996

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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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