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为明确东莨菪内酯对朱砂叶螨Tetranychus cinnabarinus(Boisduval)实验种群的亚致死效应,为其作为植物源杀螨剂的进一步开发及应用提供理论依据,在室内采用叶碟饲养的方法,并利用生命表技术研究了东莨菪内酯亚致死剂量对朱砂叶螨F0代和F1代种群生长发育和繁殖的影响。结果表明:东莨菪内酯LC40,LC30和LC20剂量处理朱砂叶螨雌成螨后,可刺激F0代雌成螨产卵,使产卵量分别增加了73.82%,186.97%和70.18%,而对成螨寿命、产卵期和雌雄性比没有影响;F1代的卵期、幼螨期和若螨期与对照没有显著性差异(P>0.05),而成螨期和雌成螨寿命均低于对照;对F1代繁殖力的影响主要表现为产卵期缩短、产卵量减少和雌性比下降;子代种群的净生殖率(R0)由50.5976最低降至33.9910,世代平均历期(T)和种群倍增时间(Dt)均低于对照,各处理后的朱砂叶螨种群均存在适合度缺陷。这些结果表明,在亚致死剂量下,东莨菪内酯能够降低朱砂叶螨种群的发育和繁殖速率,这对东莨菪内酯在有害生物防治上的应用具有积极意义。
In order to clarify the sublethal effect of scopoletin on experimental population of Tetranychus cinnabarinus (Boisduval) and to provide a theoretical basis for its further development and application as a plant-derived acaricide, leaf trays were used indoors for indoor development and utilization Life Table Technique The effects of sub-lethal doses of scopoletin on the growth and reproduction of F0 and F1 generations of Tetranychus cinnabarinus were studied. The results showed that the scopolactone LC40, LC30 and LC20 treatment of female adult mites Tetranychus cinnabarinus, can stimulate F0 adult female mites spawn, the fecundity increased by 73.82%, 186.97% and 70.18%, respectively, while the There was no significant difference in life span, spawning period and the ratio of male and female adults. There was no significant difference in egg stage, young mite stage and nymph stage (P> 0.05) between F1 generation and adult mites In contrast, the effects on F1 fecundity were mainly shortened by spawning period, reduced fecundity and females ratio. The net reproductive rate (R0) of offspring population was reduced from 50.5976 to 33.9910, the average generation duration (T ) And population doubling time (Dt) were lower than that of the control. The spider mite population of T. cinnabarinus had fitness defects after treatment. These results indicate that scopoletin can reduce the development and reproduction rate of Tetranychus cinnabarinus at sublethal doses, which is of positive significance for the application of scopoletin in pest control.