Effects of Acclimatization to the Extracts from Target Pest on Host Preference of Trichogramma dendrolimi

doi:10.16409/j.cnki.2095-039x.2021.01.002

Abstract

Abstract: The egg parasitoid, Trichogramma dendrolimi, successfully mass-reared on the factitious eggs of Chinese oak silk moth, Antheraea pernyi, has been widely used as an effective biological control agent against multiple lepidopteran pests. However, the preference of T. dendrolimi for the target host pest will decline as the wasps are reared on A. pernyi eggs for a long time. This study aimed to examine the preference of both bisexual Wolbachia-uninfected and thelytokous Wolbachia-infected lines of T. dendrolimi for the target pest eggs. The T. dendrolimi offspring was treated by the odour of the extracts of Ostrinia furnacalis eggs, larvae, and abdomen scales. The host selection of treated offspring wasps was investigated between A. pernyi eggs and O. furnacalis eggs. The results showed that, in the control group, thelytokous females showed a higher preference for O. furnacalis eggs than bisexual females. Regardless of different extract, the bisexual females treated by the extracts exhibited higher preference for O. furnacalis eggs than the control females. The bisexual females treated by the extract of the abdominal scales of O. furnacalis female moths showed the highest selection and instantaneous preference for O. furnacalis eggs. However, the selection rate and instantaneous preference of thelytokous females were not influenced by the extracts. The residence duration of females was not affected by Trichogramma line and the extracts. The results provide a new insight in the improvement of the control efficacy of mass-reared T. dendrolimi wasps on the target pest.

Key words: Trichogramma dendrolimi, host preference, parthenogenesis, chemical legacy hypothesis, mass- rearing

CLC Number:

S476.3

ZHANG Zhuting, YING Mei, ZHOU Jincheng, DONG Hui. Effects of Acclimatization to the Extracts from Target Pest on Host Preference of Trichogramma dendrolimi[J]. Chinese Journal of Biological Control, 2021, 37(1): 70-76.

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