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Institut Sophia Agrobiotech

UMR INRA - Univ. Nice Sophia Antipolis - Cnrs

http://www.paca.inra.fr/institut-sophia-agrobiotech_eng/

Pest Management Science

24 November 2017

Pest Management Science
© 2017 John Wiley & Sons, Inc.
Advantages of diapause in Trichogramma dendrolimi mass production via eggs of the Chinese silkworm, Antheraea pernyi

Abstract

BACKGROUND

Trichogramma dendrolimi Matsumura is widely used as biological control agent for lepidopteran agricultural pests control in China and can be successfully reared using the large eggs of the Chinese silkworm, Antheraea pernyi. In this study, biological parameters of diapaused, non-diapaused, and cold-stored T. dendrolimi were investigated for two generations on host eggs of A. pernyi under the laboratory conditions.

RESULTS

The cold-stored T. dendrolimi performed poorer than diapaused and non-diapaused T. dendrolimibased on biological parameters. For F1 generation, the non-diapaused T. dendrolimi had higher emergence rate, longer longevity, and lower deformed proportion than diapaused T. dendrolimi. For F2 generation, the diapaused T. dendrolimi had lower proportion of unemerged parasitoids than those of non-diapaused. However, the diapaused T. dendrolimi had higher number of parasitized hosts than those of non-diapaused in both generations. For F1 generation, similar index of population trend (I) for diapaused (140.792) and non-diapaused (141.542) T. dendrolimiwas found and it was approximately 3.4 times than that of cold-stored T. dendrolimi (41.698). For F2 generation, the diapaused T. dendrolimi showed the largest I (146.791), followed by non-diapaused (136.859) and cold-stored T. dendrolimi (59.607).

CONCLUSION

In a three-year augmentative field release from 2014 to 2016, diapaused Trichogramma showed effective parasitism on eggs of the Asian corn borer, Ostrinia furnacalis. These results indicated that diapaused T. dendrolimi can be an efficient and alternative method for mass rearing of T. dendrolimi for long-term cold storage.

Zhang, J.-J., Zhang, X., Zang, L.-S., Du, W.-M., Hou, Y.-Y., Ruan, C.-C., and Desneux, N. Advantages of diapause in Trichogramma dendrolimi mass production via eggs of the Chinese silkworm, Antheraea pernyi. Pest. Manag. Sci. DOI: 10.1002/ps.4795

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