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Performance of diapausing parasitoid wasps, Habrobracon hebetor, after cold storage

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The ectoparasitoid Habrobracon hebetor Say (Hymenoptera: Braconidae) is an important potential biological control agent for lepidopterous pests of stored products. We investigated the effects of long-term cold storage of diapausing and non-diapausing H. hebetor on their performance after cold storage. Mortality during storage increased with increasing storage duration, and the mortality of diapausing females was lower than those of nondiapausing females after 8, 12, and 16 weeks of storage. Longevity, egg laying, number of progeny produced, and time to 50% egg laying were all reduced, as compared with the culture females reared at conditions that do not induce diapause. But, for females reared at 20°C at conditions that induce diapause, all of these quality parameters did not differ from those of culture insects when the storage duration was 8 weeks or less. The percentage of female F1 offspring was always lower for cold stored insects than for the culture insects. Presence of a male after cold storage did not impact any of the quality parameters measured. Thus, rearing parasitoids at 20°C and 10L:14D for up to 8 weeks would produce parasitoids that are similar to culture parasitoids, except that the percentage of females is lower than that in the cultures (36 versus 52%).
Haoliang Chen , Hongyu Zhang , Kuun Yan Zhu , James E Throne
Bracon hebetor , biological control agents , cold storage , diapause , ectoparasites , females , insect rearing , long term effects , longevity , males , mortality , oviposition , parasitoids , progeny , storage pests , storage time
Biological control 2013 v.64 no.3
Journal Articles, USDA Authors, Peer-Reviewed
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