NDLI: Cold stored ectoparasitoid of Cydia fruit moths released under different temperature regimes

Content Provider	Springer Nature Link
Author	Häckermann, Johanna Rott, Anja S. Tschudi Rein, Kathrin Dorn, Silvia
Copyright Year	2007
Abstract	Cold storage of parasitoids to be used in biological control programs is desirable but risky for the performance of the stored parental generation as well as for its offspring. We studied the performance of cold stored and unstored parasitoids after release at different temperature regimes in the laboratory at the level of two subsequent generations in Hyssopus pallidus (Askew) (Hymenoptera: Eulophidae). This gregarious ectoparasitoid is a candidate biocontrol agent of Cydia pomonella L. (Lepidoptera: Tortricidae) and Cydia molesta (Busck) (Lepidoptera: Tortricidae) larvae, two fruit pests of high economic significance in apple cultivation. Cold storage for 14 days at 4°C imposed to the pupal stage of the parasitoid did not reduce the parasitism capacity of the parental generation, nor did it alter the female biased sex ratio of the progeny. Remarkably, this short-term storage of the parental generation exhibited a significant and consistently positive effect on offspring weight throughout all ambient temperature regimes, resulting in an increased offspring weight. Furthermore, offspring number was only reduced after release at low ambient temperatures, but not at 25°C and 30°C. Irrespective of whether the parasitoids originated from the stored or unstored group, highest parasitism rate was achieved at temperatures above 20°C. In conclusion, this candidate biocontrol agent can be cold stored for short periods without any measurable quality loss after release at most except at low ambient temperatures. Our findings suggest that H. pallidus is a thermophilous parasitoid that will perform best when applied at warm ambient temperatures in fruit orchards.
Starting Page	857
Ending Page	867
Page Count	11
File Format	PDF
ISSN	13866141
Journal	BioControl
Volume Number	53
Issue Number	6
e-ISSN	15738248
Language	English
Publisher	Springer Netherlands
Publisher Date	2007-12-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Biological control Cold storage Ambient temperature Hyssopus pallidus Cydia Parasitism Offspring fitness Behavioural Sciences Animal Biochemistry Animal Ecology Agriculture Plant Pathology Entomology
Content Type	Text
Resource Type	Article
Subject	Insect Science Agronomy and Crop Science

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