Fitness consequences of host-switching by Psix saccharicola (Hymenoptera: Scelionidae), a stink bug egg parasitoid in pistachio orchards
کد مقاله : 1140-11THCBIOCONTROL (R3)
عباس اسماعیلی سرداری *1، محمد امین جلالی2، فاطمه رنجبر3، مهدی ضیاءالدینی4
1دانشگاه ولیعصر (عج) رفسنجان
2گیاهپزشکی، دانشکده کشاورزی، دانشگاه ولیعصر (عج) رفسنجان، رفسنجان، ایران
3دانشگاه ولیعصر (عج) رفسنجان، رفسنجان، ایران
4گروه گیاهپزشکی، دانشکده‌ی کشاورزی، دانشگاه ولی عصر (عج) رفسنجان
چکیده مقاله:
Psix saccharicola (Hymenoptera: Scelionidae) parasitizes eggs of the stink bugs Acrosternum arabicum Wagner and Brachynema germari Kolenati (Hemiptera: Pentatomidae) that damage pistachio nuts in Rafsanjan, Iran. We reared P. saccharicola on each bug species for three generations, then transferred them to the alternate host for two generations and tested female responses to host switching. Survival was >90% on both hosts, but eggs of A. arabicum were parasitized at higher rates and yielded faster wasp development with greater fecundity, and a more female-biased sex ratio, than eggs of B. germari. Rearing on A. arabicum incredibly increased wasp fitness on B. germari, and the F1 progeny of wasps reared on A. arabicum and switched to B. germari inherited some beneficial parental effects, including higher rates of parasitism, and more female biased sex ratios, relative to the F2 generation, or wasps continuously reared on B. germari. Eggs of A. arabicum are more convenient and cost-effective to produce than those of B. germari, and our results suggest that augmentative release of P. saccharicola against B. germari (the most damaging stink bug species) could be more feasible by laboratory mass-rearing of this wasp on A. arabicum.
کلیدواژه ها:
Acrosternum arabicum · Brachynema germari · Host suitability · Life table parameters · Sex ratio · Survival
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