Predation functional response and life table parameters of Orius sauteri (Hemiptera: Anthocoridae) feeding on Megalurothrips usitatus (Thysanoptera: Thripidae)
Keywords:
bean flower thrips, flower bugs, cowpea, biological controlAbstract
Bean flower thrips, Megalurothrips usitatus (Bagnall) (Thysanoptera: Thripidae), is a serious pest of cowpea in Hainan province, China. In this study, the predation functional response and life table parameters of the minute pirate bug, Orius sauteri (Poppius) (Hemiptera: Anthocoridae), feeding on M. usitatus were measured in the laboratory. The functional response of O. sauteri to increasing M. usitatus density was described by Holling’s disc equation, and the maximum predation rate was 45.3 over 24 h. The intraspecific interference of O. sauteri was significant with increasing O. sauteri density. Orius sauteri was able to complete its life cycle feeding on M. usitatus, with an intrinsic rate of increase (r) of 0.16 and fecundity of 95.4 eggs per female. Female and male minute pirate bugs consumed an average of 304.7 and 104.0 thrips over their lifetimes, respectively. These results show O. sauteri to be a potential biological control agent in the integrated pest management of M. usitatus.
Resumen
El trips de las flores de frijól, Megalurothrips usitatus (Bagnall) (Thysanoptera: Thripidae), es una plaga grave del caupí en la provincia de Hainan, China. En este estudio, se midieron en el laboratorio la respuesta funcional de predación y los parámetros de la tabla de vida de la chinche pirata, Orius sauteri (Poppius) (Hemiptera: Anthocoridae), que se alimenta de M. usitatus. La respuesta funcional de O. sauteri al aumento de la densidad de M. usitatus fue descrita por la ecuación de disco de Holling y la tasa máxima de depredación fue de 45.3 para 24 horas. La interferencia intraespecífica de O. sauteri fue significativa con el aumento de la densidad de O. sauteri. Orius sauteri pudo completar su ciclo de vida alimentándose de M. usitatus, con una tasa intrínseca de aumento (r) de 0.16 y una fecundidad de 95.4 huevos por hembra. Las hembras y machos de la chinche pirate consumieron un promedio de 304.7 y 104.0 trips durante su vida, respectivamente. Estos resultados muestran que O. sauteri es un agente potencial de control biológico en el manejo integrado de plagas de M. usitatus.
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