Chen Yi-Chai, Tian Tai-An, Chen Yi-Hui, Yu Li-Chen, Hu Ji-Feng, Yu Xiao-Fei, Liu Jian-Feng, Yang Mao-Fa
Guizhou Provincial Key Laboratory for Agricultural Pest Management of the Mountainous Region, Institute of Entomology, Scientific Observing and Experimental Station of Crop Pest in Guiyang, Ministry of Agriculture, Guizhou University, Guiyang 550025, China.
Guizhou Institute for Metrology and Calibration, Guiyang 550003, China.
Insects. 2021 May 25;12(6):490. doi: 10.3390/insects12060490.
spp. are small, toxic, ectoparasitic mites that suppress Coleoptera, Hemiptera, and Lepidoptera plant pests. To explore their potential use as a biocontrol agent, we studied the reproductive development, paralytic process, time to lethality and mortality, and searching ability of on different developmental stages of the oriental leafworm moth, . gained 14,826 times its body weight during pregnancy. One single female could rapidly kill one egg and first to third instar larvae, but not fourth to sixth instar larvae, prepupae, or pupae within 720 min. could develop on eggs, first to sixth larvae, and pupae, but only produced offspring on the eggs and pupae. A single female (an average weight of 23.81 ng) could paralyze and kill one third instar larvae (an average weight of 16.29 mg)-680,000 times its own weight. Mites significantly affected the hatch rate of eggs, which reduced with increasing mite densities on eggs. Releasing 50 or 100 in a 2 cm searching range resulted in significantly higher mortality rates of first instar larvae within 48 h compared to second and third instar larvae in searching ranges of 4.5 and 7.5 cm within 24 h. To the best of our knowledge, this is the first study to reveal that undergoes the greatest changes in weight during pregnancy of any adult female animal and has the highest lethal weight ratio of any biocontrol agent.
[物种名称]是小型有毒的外寄生螨，可抑制鞘翅目、半翅目和鳞翅目植物害虫。为探索其作为生物防治剂的潜在用途，我们研究了[物种名称]对东方粘虫不同发育阶段的生殖发育、麻痹过程、致死时间和死亡率以及搜索能力。[物种名称]在孕期体重增加了14826倍。一只[物种名称]雌螨能在720分钟内迅速杀死一枚东方粘虫卵和一至三龄幼虫，但不能杀死四至六龄幼虫、预蛹或蛹。[物种名称]能在卵、一至六龄幼虫和蛹上发育，但仅在卵和蛹上产生后代。一只[物种名称]雌螨（平均体重23.81纳克）能麻痹并杀死一只三龄幼虫（平均体重16.29毫克）——是其自身重量的680000倍。螨显著影响东方粘虫卵的孵化率，随着螨在卵上密度的增加，孵化率降低。在2厘米的搜索范围内释放50只或100只[物种名称]，与在4.5厘米和7.5厘米搜索范围内24小时内的二龄和三龄幼虫相比，48小时内一龄幼虫的死亡率显著更高。据我们所知，这是第一项揭示[物种名称]在任何成年雌性动物孕期体重变化最大且作为生物防治剂具有最高致死重量比的研究。
