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Abstract
Barriers of seven single-sized and two mixed-sized particles were exposed to field populations of the Formosan subterranean termite, Coptotermes formosanus Shiraki, and the eastern subterranean termite, Reticulitermes flavipes (Kollar) for 1-3 mo. Compared with previous laboratory results, field populations of subterranean termites were generally more successful in penetration of sand barriers composed of sized particles. Barriers of particles in sizes 2.00-2.36 and 2.36–2.80 mm were least penetrated by soilborne colonies of C. formosanus . Three single-sized barriers (1.70–2.00, 2.00–2.36, and 2.36–2.80 mm) and two mixed-sized barriers (1.18–2.80 and 1.70–2.36 mm) were most effective against field populations of R. flavipes . In areas where both C. formosanus and Reticulitermes spp. occur, the two single-sized particle barriers (2.00–2.36 and 2.36–2.80 mm) appeared to be the most effective exclusion devices against field populations of these subterranean termites.
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