- Department of Ecology, Swedish University of Agricultural Sciences
Ding, Nan; Dalin, Peter; Zhu, Qing-Hua; Ma, Wei-Hua; Zhu, Fen; Wang, Xiao-Ping
It has been suggested that the striped stem borer, Chilo suppressalis (Walker), has developed distinct populations inhabiting rice Oryza sativa (Linnaeus) and water-oats Zizania latifolia (Turcz). In this study, we compared several biological traits between overwintering larvae from rice and water-oat fields during the winter of 2010. The parasitism rate was significantly higher in the larvae that overwintered in the rice field than in those that overwintered in the water-oat field. The average body weight of overwintering larvae and the weight of 3-day-old pupae, as well as the number of eggs carried by adult females, were all significantly greater in the samples from the water-oat field. The diapause intensity, defined as the number of days required until pupation by overwintering larvae transferred to 25 A degrees C and L:D 16:8 h, decreased progressively from January to March but decreased more rapidly in the water-oat field. Our results demonstrate differences in the overwintering biology of C. suppressalis larvae from rice and water-oat fields. These differences may contribute to the differentiation and reproductive isolation between host-plant populations in this species.
Body weight; Chilo suppressalis; Diapause intensity; Eggs carried by adult female; Host plant; Overwintering larva; Parasitic wasp
Applied Entomology and Zoology
2013, Volume: 48, number: 2, pages: 147-153
Publisher: SPRINGER JAPAN KK