Host plant-related parasitism and host feeding activities of diglyphus isaea (Hymenoptera : Eulophidae) on liriomyza huidobrensis, liriomyza sativae, and liriomyza trifolii (Diptera : Agromyzidae)

摘要

Host plant species can affect the behavior and attributes of parasitoids, such as hostsearching, oviposition, and offspring Þtness. In this study, parasitism, host feeding, and sex ratios ofDiglyphus isaea (Walker) (Hymenoptera: Eulophidae) on Liriomyza huidobrensis (Blanchard), Liriomyzasativae Blanchard, and Liriomyza trifolii (Burgess) (Diptera: Agromyzidae) larvae reared onPhaseolus vulgaris L., Pisum sativum L., Solanum lycopersicum L., and Vicia faba L. were determined.In no-choice tests, L. huidobrensis had the highest rate of parasitism when reared on P. vulgaris (46%),L. sativae when reared on V. faba (59%) and P. vulgaris (59%), and L. trifolii when reared on S.lycopersicum (68%). Host feeding in no-choice tests ranged between 2% and 36% and was highest onL. trifolii reared onV. faba. Results of choice tests showed a signiÞcant interaction effect for host plantand Liriomyza species on parasitism and host feeding. Within plant mixtures, L. sativae reared on P.vulgaris had the highest rate of parasitism (31%), followed by L. trifolii on S. lycopersicum (29%) andL. huidobrensis onV. faba (28%). Host feeding was highest onL. trifolii reared on S. lycopersicum (14%)and lowest on L. huidobrensis reared on P. sativum and S. lycopersicum (1%). In some instances, plantmixtures resulted in a higher proportion of females of D. isaea than single plant species. The highestproportion of females was obtained in plant mixtures on L. huidobrensis and L. trifolii on V. faba (71and 72%, respectively). This study suggests that planting crop mixtures can potentially lead to higherproportions of females, thus improving parasitism and host feeding, depending on Liriomyza and hostplant species.