Zuo Li, Chen Wenrui, Tang Siqiong, Fang Chen, Dou Jifei, Su Jie, Zhang Jianping
Key Laboratory of Oasis Agricultural Pest Management and Plant Protection Resources Utilization, Xinjiang Uygur Autonomous Region, College of Agriculture, Shihezi University, Shihezi, China.
J Econ Entomol. 2025 Jun 13;118(3):1072-1082. doi: 10.1093/jee/toaf058.
In biological control, prey type, structure, and abundance influence predator populations. The predatory mite Neoseiulus bicaudus Wainstein (Acari: Phytoseiidae) can control both Tetranychus turkestani Ugarov et Nikolskii (Acari: Tetranychidae) and Tetranychus truncatus Ehara (Acari: Tetranychidae), which often coexist in nature. Does N. bicaudus feeding on both prey species in mixed field populations experience enhanced population growth or remain unaffected by prey type? This study used the age-stage 2-sex life table theory to examine the developmental and reproductive characteristics of N. bicaudus fed the 2 prey (T. truncatus: T. turkestani at 1:20, 1:10, and 1:5 ratios) and a single prey diet (T. turkestani is a dominant species for crops such as cotton in Northern Xinjiang). The results showed that, compared to a single prey diet (where the preadult stage duration 5.367 d, intrinsic rate of increase (r) = 0.198 d-1, finite rate of increase (λ) = 1.219 d-1, and mean generation time (T) = 12.81 d), the mixed prey diet significantly shortened the preadult stage, increased fecundity, and enhanced the values of r and λ, while shortening T. The population had the highest intrinsic rate of increase at a ratio of 1:5 (preadult stage = 4.906 d, r = 0.245 d-1, λ = 1.277 d-1, and T = 11.58 d). Compared to single-prey feeding, mixed prey ratios of 1:20, 1:10, and 1:5 increased population growth by 1.39, 2.72, and 6.59 times, respectively. Therefore, mixed prey enhances the development and reproduction of N. bicaudus, thereby further optimizing its mass rearing and field release.
在生物防治中，猎物的类型、结构和数量会影响捕食者种群。捕食螨双尾新小绥螨（Neoseiulus bicaudus Wainstein，蜱螨亚纲：植绥螨科）能够控制土耳其斯坦叶螨（Tetranychus turkestani Ugarov et Nikolskii，蜱螨亚纲：叶螨科）和截形叶螨（Tetranychus truncatus Ehara，蜱螨亚纲：叶螨科），这两种叶螨在自然界中常共存。在混合田间种群中以这两种猎物为食的双尾新小绥螨，其种群增长会增强还是不受猎物类型影响呢？本研究利用年龄-阶段两性生命表理论，研究了取食两种猎物（截形叶螨与土耳其斯坦叶螨比例为1:20、1:10和1:5）以及单一猎物（土耳其斯坦叶螨是新疆北部棉花等作物的优势种）的双尾新小绥螨的发育和繁殖特性。结果表明，与单一猎物日粮（若虫前期持续时间为5.367天，内禀增长率（r）=0.198天-1，周限增长率（λ）=1.219天-1，平均世代时间（T）=12.81天）相比，混合猎物日粮显著缩短了若虫前期，提高了繁殖力，提高了r和λ的值，同时缩短了T。在1:5的比例下，种群的内禀增长率最高（若虫前期=4.906天，r=0.245天-1，λ=1.277天-1，T=11.58天）。与单猎物饲养相比，1:20、1:10和1:5的混合猎物比例使种群增长分别提高了1.39倍、2.72倍和6.59倍。因此，混合猎物促进了双尾新小绥螨的发育和繁殖，从而进一步优化了其大规模饲养和田间释放。
