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Diapause induction and termination in Indian strains of Trichogramma chilonis (Hymenoptera: Trichogrammatidae)

Published online by Cambridge University Press:  09 August 2017

Enakshi Ghosh  and
Chandish R. Ballal
Enakshi Ghosh*
Affiliation:
Indian Council of Agricultural Research, National Bureau of Agricultural Insect Resources, PO Box 2491, H.A Farm Post, Bellary Road, Bengaluru 560024, India Department of Biotechnology, Center for Post Graduate Studies, Jain University, Jayanagar, 9th Block, Bengaluru 560011, Karnataka, India
Chandish R. Ballal
Affiliation:
Indian Council of Agricultural Research, National Bureau of Agricultural Insect Resources, PO Box 2491, H.A Farm Post, Bellary Road, Bengaluru 560024, India
*
1Corresponding author (e-mail: [email protected])
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Abstract

The role of temperature in diapause induction was studied as a mode of long-term storage of Trichogramma chilonis (Ishii) (Hymenoptera: Trichogrammatidae). Three different strains of this widely used biocontrol agent (T. chilonis Nilgiris strain, T. chilonis Kodaikanal strain, and T. chilonis 15 °C strain) reared on the factitious host Corcyra cephalonica (Stainton) (Lepidoptera: Pyralidae) were used for this experiment. Except T. chilonis laboratory strain, all the other strains could successfully undergo diapause at their pre-pupal stage. Maximum percentage of healthy pre-pupae were recorded in the three strains by providing a pre-storage temperature of 10 °C for 35 days with eight hours of photophase wherein 75–87% could enter into diapause. Further, at a maintenance temperature of 5 °C with 24 hours of scotophase, diapause could be maintained. Diapause could be terminated after six months of storage with 23–36% of adult emergence. However, there was significant reduction in longevity and parasitism rate of the emerged adults. Considering superior biological parameters, 95 days of storage (including pre-storage duration) could provide around 60% adult emergence. Successful long-term storage of T. chilonis strains through diapause induction can facilitate commercial insectaries in stockpiling this biocontrol agent for large-scale field releases. This is the first study on successful induction and termination of diapause in T. chilonis strains and evaluating their performance attributes.

Type
Behaviour & Ecology
Information
The Canadian Entomologist , Volume 149 , Issue 5 , October 2017 , pp. 607 - 615
Copyright
© Entomological Society of Canada 2017 

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Footnotes

Subject editor: Brent Sinclair

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