Performance of Aphis glycines Matsumura (Hemiptera: Aphididae) reared under different methods
Abstract
Soybean aphid, Aphis glycines Matsumura (Hemiptera: Aphididae), is an important soybean pest in North America. In this study, A. glycines was fed on detached leaves of Glycine max (L.) Merrill (Fabaceae) at 20, 23, 26, 29, and 32 °C under 3 rearing methods: leaf-disc method, filter paper method, and moisturized cotton method. Aphis glycines life parameters, including nymph stage duration, adult lifespan, adult fecundity, adult body size, and intrinsic rate of increase were measured. There were no significant differences in nymph stage duration among these rearing methods at 20 to 32 °C. Within this temperature range, the filter paper method and the moisturized cotton method resulted in similar or greater adult lifespans, adult fecundities, adult body sizes, and intrinsic rates of increase in comparison to the leaf-disc method. When nymphs of A. glycines were reared at 20 to 29 °C, the experimental labor required for the moisturized cotton method was less than that for the filter paper method and the leaf-disc method. Considering the development, reproduction, and experimental labor, the moisturized cotton method is recommended as a good detached leaf method for rearing individual A. glycines. These conclusions will be useful and informational for researchers who study A. glycines, especially when selecting methods to rear A. glycines individually in the laboratory.
Resumen
El pulgón de la soja, Aphis glycines Matsumura (Hemiptera: Aphididae), es una plaga importante de la soja en América del Norte. En este estudio, A. glycines fue alimentado con hojas desprendidas de Glycine max (L.) Merrill (Fabaceae) a 20, 23, 26, 29 y 32 °C bajo 3 métodos de crianza: método de disco de hoja, método de papel de filtro y método de algodón humedecido. Se midieron los parámetros de vida del A. glycines, incluyendo la duración de la estadio del ninfa, la duración de vida de los adultos, la fecundidad, el tamaño corporal adulto y la tasa intrínseca de aumento. No hubo diferencias significativas en la duración del estadio de ninfa entre estos métodos de crianza a 20 a 32 °C. Dentro de este rango de temperatura, el método del papel de filtro y el método del algodón humedecido dieron resultados similares o mayores sobre la duración de vida de los adultos, la fecundidad, el tamaño corporal de adultos y la tasa intrínseca de aumento en comparación con el método del disco de hoja. Cuando se criaron las ninfas a una temperatura de 20 a 29 °C, el trabajo experimental requerido para el método del algodón humedecido fue menor que los métodos del papel de filtro y del disco de hoja. Teniendo en cuenta el desarrollo, la reproducción y el trabajo experimental, se recomienda el método del algodón humedecido como un buen método de hojas sueltas para criar los individuales de A. glycines. Estas conclusiones serán útiles e informativas para los investigadores que estudian A. glycines, especialmente al seleccionar métodos para criar A. glycines individualmente en el laboratorio.
Key Words: soybean aphid; filter paper method; leaf-disc method; moisturized cotton method
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