Efficacy of five insecticides targeting spring and fall populations of sugarcane beetle adults
Keywords:
Euetheola rugiceps, chemical control, IPM, turfgrassAbstract
Sugarcane beetle (Euetheola rugiceps LeConte; Coleoptera: Scarabaeidae) is a pest of turfgrass in the southeastern United States. This study was conducted to evaluate the toxicity of 5 products for sugarcane beetle pest management in managed bermudagrass (Cynodon dactylon L.; Poaceae). Spring and fall populations of sugarcane beetle adults were exposed to 4 active ingredients and combinations (bifenthrin, bifenthrin plus clothianidin, carbaryl, clothianidin, and dinotefuran) under greenhouse conditions. At 7 d after treatment, there were no significant differences among insecticide treatments applied to spring beetles at either a low or a high field rate, although all insecticides caused a significant increase in beetle mortality relative to untreated (control) beetles. In contrast, bifenthrin caused significantly greater control of fall populations at the low field rate compared with other treatments. Target population (spring or fall) appears to have more impact on pesticide efficacy than either product selection or application rate.
Sumario
El escarabajo de la caña de azúcar (Euetheola rugiceps LeConte; Coleoptera: Scarabaeidae) es una plaga del césped en el sureste de los Estados Unidos. Se realizó este estudio para evaluar la toxicidad de 5 productos para el control del plaga escarabajo de la caña de azúcar en el manejo del pasto de Bermuda (Cynodon dactylon L; Poaceae) manejado. Las poblaciones de adultos del escarabajo de la caña de azúcar de la primavera y el otoño fueron expuestos a 4 ingredientes activos y combinaciones (bifentrina, bifentrina más clotianidina, carbaril, clotianidina y dinotefurano) bajo condiciones de invernadero. En 7 dias después del tratamiento, no hubo diferencias significativas entre los tratamientos insecticidas aplicados a los escarabajos de la primavera, ya sea en una tasa de campo baja o alta, a pesar de todo los insecticidas causaron un aumento significativo en la mortalidad del escarabajo en relación con los escarabajos (de control) no tratados. Por el contrario, bifentrina resultó en un control de las poblaciones del otoño significativamente mayor con una tasa de campo baja en comparación con los otros tratamientos. La población objetivo (primavera u otoño) parece tener un mayor impacto sobre la eficacia de los pesticidas que entre la selección de productos o la tasa de aplicación.
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