ABSTRACT The two-spotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae) is a serious pest of many agricultural crops. Using chemical pesticides is one of the main methods for its management. In this study, sublethal effects of diflovidazin including LC5, LC10, LC20, and distilled water were evaluated on biological parameters (such as r, λ, gross reproductive rate, R0, and T) of T. urticae. The experiments were done under laboratory condition at 25 ± 2°C, 60 ± 5% relative humidity (RH), and a photoperiod of 16:8 (L: D) hours. The crude data were analysed based on age-stage, two-sex life table analysis. The results indicated significant reduction in female’s duration of maturation, oviposition period, and total fecundity by increasing examined dose. The highest and lowest values of the net reproductive rate (R0) were obtained 48.88 and 31.14 offspring/individual in control and LC20, respectively. The maximum value of intrinsic rate of increase (r) was 0.234 day−1 that obtained in control treatment, while the minimum value was 0.216 day−1 obtained in LC20 concentration. Finite rate of increase (λ) had not significantly descended with concentration enhancing from LC5 to LC20 compared with the control. The results demonstrated that diflovidazin could be incorporated in integrated pest management programmes of T. urticae.

中文翻译：

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二氟维嗪对二斑叶螨Tetranychus urticae（Acari：Tetranychidae）生命表参数的亚致死作用

摘要 二斑叶螨(Tetranychus urticae Koch (Acari: Tetranychidae) 是许多农作物的严重害虫。使用化学农药是其管理的主要方法之一。在本研究中，包括 LC5、LC10、LC20 和蒸馏水在内的二氟维达嗪对荨麻疹的生物学参数（如 r、λ、总繁殖率、R0 和 T）的亚致死作用进行了评估。实验在 25 ± 2°C、60 ± 5% 相对湿度 (RH) 和 16:8 (L: D) 小时的光周期的实验室条件下进行。基于年龄阶段、两性生命表分析对粗数据进行分析。结果表明，通过增加检查剂量，雌性的成熟持续时间、产卵期和总繁殖力显着减少。获得了净繁殖率 (R0) 的最高和最低值 48。分别为 88 和 31.14 后代/个体在控制和 LC20 中。在对照处理中获得的内在增长率 (r) 的最大值为 0.234 天-1，而在 LC20 浓度中获得的最小值为 0.216 天-1。与对照相比，随着从 LC5 到 LC20 的浓度增加，有限增加率 (λ) 没有显着下降。结果表明，diflovidazin 可以纳入荨麻疹的综合害虫管理计划。与对照相比，随着从 LC5 到 LC20 的浓度增加，有限增加率 (λ) 没有显着下降。结果表明二氟维嗪可以被纳入荨麻疹的综合害虫管理计划。与对照相比，随着从 LC5 到 LC20 的浓度增加，有限增加率 (λ) 没有显着下降。结果表明，diflovidazin 可以纳入荨麻疹的综合害虫管理计划。