Functional and Numerical Responses of Tytthus chinensis (Hemiptera: Miridae) to Sogatella furcifera (Hemiptera: Delphacidae)

文献类型： 外文期刊

第一作者： Huang, Qian

作者： Huang, Qian;Long, Liping;Huang, Suosheng;Wu, Biqiu;Li, Cheng;Ling, Yan

作者机构：

关键词： mirid bug; rice planthopper; predatory natural enemy; biological control; prey density; population dynamics; sustainable pest management

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： 2025 年 16 卷 4 期

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收录情况： SCI

摘要： The predatory function and numerical responses of natural enemy insects are critical for evaluating their biological control potential, particularly in understanding pest suppression mechanisms and ecological adaptability. Here, we examined the predation capacity of Tytthus chinensis St & aring;l (Hemiptera: Miridae) on Sogatella furcifera eggs under laboratory conditions (24 +/- 1 degrees C, 12:12 h light:dark photoperiod, 75% humidity). Functional response experiments were conducted at different prey densities (3, 4, 10, 20, and 30 eggs/day), and life table parameters were established to evaluate the effects of prey density on the development, reproduction, and population dynamics of T. chinensis. The daily average predation of nymphs significantly increased with age, and their functional responses fitted the Holling Type II response. In the adult stage, the daily average predation of females was significantly higher than that of males, and males had a higher a/Th ratio, which reflected sex-specific predation strategies. Prey density significantly influenced survival, reproduction, and population dynamics. The minimum prey density required for population stability was 4 eggs/day, and survival and reproduction rates markedly increased at 10 eggs/day. At 30 eggs/day, females reproduced earlier, and the lifespan of males was shortened. These findings confirm the strong pest control ability of T. chinensis and highlight the critical role of S. furcifera egg density in regulating the population dynamics of T. chinensis.

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