Factors Affecting Mating in Chelonus formosanus Sonan

doi:10.16409/j.cnki.2095-039x.2022.11.024

Abstract

Abstract: Chelonus formosanus Sonan is a dominant parasitoid of many lepidopteran pests and has great potential for utilization in the biological control of pests. The effects of different factors (temperatures, nutrition, sex ratios, dating time, and space size) on mating of C. formosanus were tested so as to improve efficiency of mass-rearing by increasing the female rate. The results showed that the mating rate increased gradually with the increase in temperature. The highest mating rate of 45.0% was achieved at 32℃. The mating rate was not significantly affected by nutrition. When the sex ratio was 1♀:1♂, the mating rate was the lowest, only 7.5%; the highest mating rate was 80.0% when the ratio was 1♀:7♂. The mating rate increased with the extension of dating time. The highest rate of 75.0% was obtained with the dating time of 5 days. As the volume of the space gradually increased from 348 cm³ to 1920 cm³, the mating rate decreased gradually, and the lowest was 5.0%. The optimal combination of factors was established and the highest mating rate of 97.5% was observed.

Key words: Chelonus formosanus, mating, dating time, sex ratios

CLC Number:

S476.3

WANG Luchao, LIN Zhufeng, JIA Jingjing, YU Zirong, JI Xuncong. Factors Affecting Mating in Chelonus formosanus Sonan[J]. Chinese Journal of Biological Control, 2023, 39(4): 774-781.

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