Field capture of male oriental fruit flies (Diptera: Tephritidae) in traps baited with solid dispensers containing varying amounts of methyl eugenol
Abstract
Detection of invasive populations of Bactrocera dorsalis relies on traps baited with the male-specific attractant methyl eugenol. Standard protocol involves applying 5 mL of liquid methyl eugenol (1% naled) to a cotton wick, which is then placed inside a Jackson trap. Because of the lure’s high volatility, the lure is replaced every 6 wk. Prolonging the lure’s longevity would increase trap servicing intervals and reduce associated costs. Conducted at 2 sites in Hawaii, the present study investigated the performance of weathered solid dispensers containing 3, 6, or 10 g of methyl eugenol, deployed with solid insecticidal strips, relative to freshly baited liquid-bearing cotton wicks. At the cooler site, the solid lure/toxicant combination captured as many males as the fresh liquid formulation for as long as 12 wk. At the warmer site, the solid lure/toxicant system had shorter longevity, apparently owing to the reduced effectiveness of the insecticidal strip over time.
Sumario
La detección de poblaciones invasoras de Bactrocera dorsalis se basa en trampas cebadas con el atrayente metil eugenol específico para los machos. El protocolo estándar implica la aplicación de 5 mL de metil eugenol líquido (naled al 1%) a una mecha de algodón, que luego se coloca dentro de una trampa Jackson. Se reemplaza el señuelo cada 6 semanas debido a la alta volatilidad del señuelo. Al prolongar la longevidad del señuelo aumentaría los intervalos de mantenimiento de las trampas y reduciría los costos asociados. Realizado en 2 sitios en Hawái, el presente estudio investigó el rendimiento de dispensadores de sólidos desgastados que contienen 3, 6, o 10 g de metil eugenol, desplegados con tiras insecticidas sólidas, en relación con mechas de algodón con líquido recién cebado. En el lugar más fresco, la combinación de señuelo sólido/tóxico capturó tantos machos como la formulación líquida fresca durante un período de hasta 12 semanas. En el sitio más cálido, el sistema de señuelo sólido/tóxico tuvo una longevidad más corta, aparentemente debido a la menor efectividad de la tira de insecticida con el tiempo.
Key Words: Bactrocera dorsalis; invasive species; male lure; detection
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