Effects of Short-term Low Temperature Stress on Survival, Development and Reproduction of the Coccophagus japonicus Compere

doi:10.16409/j.cnki.2095-039x.2022.11.025

Abstract

Abstract: This study aims to investigate the effects of short-term low-temperature stress on the survival, development and reproduction of Coccophagus japonicus Compere. Larvae and pupae of the wasps were stressed at three temperature levels, 2, 4 and 6 ℃ for 0.5, 1 and 2 d, respectively. The survival rate, developmental duration, body length, initial egg load, and female longevity of these stressed C. japonicus were assessed. Additionally, the resulting adults were exposed to 2, 4 and 6 ℃ for survival analysis. The results showed that the survival rates of larvae and pupae, the body length, the initial egg load, and the female longevity of C. japonicus were positively correlated with the temperature and negatively correlated with the duration of stress, when the wasps experienced at their larva- or pupa-stage. Also, the developmental duration was negatively correlated with the temperature and positively correlated with the duration of stress. With the decrease of temperature and the prolongation of stress time, the survival rate of larvae and pupae of C. japonicus decreased, the developmental period was prolonged, the body length was shortened, the initial egg load and the female longevity were reduced. When the adults experienced the low temperatures (2, 4 and 6 ℃), the LT₅₀was significantly shorter than that at 27 ℃. The LT₅₀of adults decreased with the decrease of temperature, being 4.88, 3.39 and 1.64 d at 6, 4 and 2 ℃, respectively. In conclusion, the short-term low temperature stress is detrimental to the population growth of the C. japonicus. Therefore, the annual low temperature and duration should be considered when applying this wasp in the field for control of Parasaissetia nigra Nietner.

Key words: Coccophagus japonicus, short-term low temperature stress, survival, development, reproduction

CLC Number:

S476.3

YANG Meijuan, CHEN Junyu, YE Zhengpei, FU Yueguan, WANG Jianyun, ZHU Junhong, ZHANG Fangping. Effects of Short-term Low Temperature Stress on Survival, Development and Reproduction of the Coccophagus japonicus Compere[J]. Chinese Journal of Biological Control, 2023, 39(5): 1029-1037.

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