文献类型： 外文期刊

第一作者： Sun, Ying

作者： Sun, Ying;Yang, Meijuan;Ye, Zhengpei;Fu, Yueguan;Chen, Junyu;Zhang, Fangping;Sun, Ying;Yang, Meijuan;Zhu, Junhong;Ye, Zhengpei;Chen, Junyu;Zhang, Fangping;Fu, Yueguan

作者机构：

关键词： Coccophagus japonicus Compere; Parasaissetia nigra Nietner; high-temperature stress; development; reproduction; parasitism function

期刊名称：INSECTS （ 影响因子：2.9； 五年影响因子：3.3 ）

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年卷期： 2024 年 15 卷 10 期

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收录情况： SCI

摘要： Simple Summary This study reveals that exposure to short-term high temperatures of 36 degrees C, 38 degrees C, and 40 degrees C, or continuous high temperatures of 32 degrees C and 34 degrees C, can adversely affect the growth, development, reproduction, and parasitism of Coccophagus japonicus Compere. In addition to negatively affecting adult female insects, C. japonicus larvae and pupae exposed to both short-term and continuous high-temperature stress showed impaired survival rates, delayed development, reduced longevity, and decreased fecundity, which also impacted offspring survival and parasitism. The results suggest that the degree of temperature stress and its duration play crucial roles in parasitoid development.Abstract The parasitoid, Coccophagus japonicus Compere (Hymenoptera: Aphelinidae) is a dominant natural enemy of Parasaissetia nigra Nietner (Hemiptera: Coccidae), an important pest of rubber trees. Much of Chinese rubber is cultivated in hotter regions such as Yunnan and Hainan, exposing applied parasitoids to non-optimal temperatures. Therefore, C. japonicus must adapt to avoid temperature-related impacts on survival and population expansion. In this study, we monitored the survival rate, developmental duration, parasitism rate, and fecundity of C. japonicus during short-term exposures to 36 degrees C, 38 degrees C, and 40 degrees C for 2, 4, and 6 h, as well as continuous exposures to 32 degrees C and 34 degrees C for 3 days. The results show that short-term exposure to high-temperature stress leads to decreased survival rate of C. japonicus larvae and pupae, with survival rates declining as temperature and duration increase. High-temperature stress also delayed insect development, reduced mature egg production, shortened the body length of newly emerged females, and decreased female lifespans. Moreover, continuous high-temperature stress was found to significantly impact the development and reproduction of C. japonicus. Compared with the CK (27 degrees C), 3 d of continuous exposure to 34 degrees C prolonged developmental duration, shortened the body length and lifespan of newly emerged females, reduced survival rate and single female fecundity, and significantly decreased offspring numbers and parasitism rates. Temperatures of 36 degrees C, 38 degrees C, and 40 degrees C decreased the mortality time of adult females to 28.78, 16.04, and 7.91 h, respectively. Adverse temperatures also affected the insects' functional response, with 8 h of stress at 36 degrees C, 38 degrees C, and 40 degrees C causing the control efficiency of C. japonicus on P. nigra. This level of stress in the parasitoids was found to reduce the immediate attack rate and search effect, prolong processing time, and attenuate interference between small prey. Parasitoid efficiency was lowest following exposure to 40 degrees C. In this study, we determined the range of high temperatures that C. japonicus populations can tolerate under short- or long-term stress, providing guidance for future field applications.

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