Dalin, Peter
- Department of Ecology, Swedish University of Agricultural Sciences
Abstract
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.
Keywords
Body weight; Chilo suppressalis; Diapause intensity; Eggs carried by adult female; Host plant; Overwintering larva; Parasitic wasp
Published in
Applied Entomology and Zoology
2013, volume: 48, number: 2, pages: 147-153
Publisher: SPRINGER JAPAN KK
SLU Authors
UKÄ Subject classification
Evolutionary Biology
Ecology
Publication identifier
- DOI: https://doi.org/10.1007/s13355-013-0164-8
Permanent link to this page (URI)
https://res.slu.se/id/publ/52360