---

期 刊 ：植物保护学报 2009年

关键词：低剂量；甲氧虫酰肼；舞毒蛾；生长发育；

Keywords:low dosages, methoxyfenozide, Lymantria dispar, development,

摘 要 ：采用药剂短期处理和连续处理,测定了低剂量LC₁₀和LC₃₀甲氧虫酰肼处理舞毒蛾4龄幼虫后,对其各项发育指标、营养指标及各发育阶段形态的影响。结果表明,LC₁₀和LC₃₀剂量甲氧虫酰肼能显著降低舞毒蛾幼虫成活率、化蛹率、6龄虫重及雌蛹重,与对照组相比,LC₃₀剂量处理24h后,舞毒蛾5龄和6龄幼虫成活率、化蛹率、6龄虫重及雌蛹重明显降低,依次为48.89%、72.62%、62.22%、0.21g和0.75g,且LC₃₀剂量对幼虫和蛹的致死性较LC₁₀剂量明显,连续处理较短期处理明显,差异均显著(P<0.05)。低剂量甲氧虫酰肼对幼虫营养指标也存在明显影响,LC₁₀剂量能抑制幼虫相对取食量 (RCR), LC₃₀剂量能抑制食物利用率 (ECI),且两者均能显著抑制幼虫相对生长率 (RGR)(P<0.05)。同时低剂量甲氧虫酰肼能导致舞毒蛾幼虫畸形,畸形率为62.53%。说明低剂量甲氧虫酰肼可取代高毒农药,用于防治森林鳞翅目害虫。

Abstract:The development indices and nutrient indices and morphology of the different developmental stages of Lymantria dispar were measured by treating 4th instar larvae within 24h and continuously treating one generation larvae with LC₁₀ and LC₃₀, respectively. The results showed that the larval survival rate, pupation rate, the 6th instar larval weight and the weight of female pupae were significantly lower by treated with LC₁₀ and LC₃₀ of methoxyfenozide. Compared with the control, the larval survival rate, pupation rate, the 6th instar larval weight and the weight of female pupae significantly decreased after LC₃₀ treatment for 24h, followed by for 48.89%, 72.62%, 62.22%, 0.21g and 0.75g. Besides, the lethality of LC₃₀ concentration to the larvae and the pupae was superior to LC₁₀ and the effect of continuously treating 4th instar larvae was superior to treating within 24h (P<0.05). The nutrient indices of L.dispar were impacted by treated with low dosages of methoxyfenozide too. The relative consumption rate (RCR) of 4th instar larvae was significantly inhibited by treated with LC₁₀ dose. The LC₃₀ dose could significantly inhibited efficiency of conversion of ingested food (ECI). Besides, the relative growth rate (RGR)were significantly inhibited by treated with LC₁₀ dose and LC₃₀ dose (P<0.05). In addition, the low dosages of methoxyfenozide had some impact on morphology of L.dispar larvae indicating different abnormality, and the abnormal rate is 62.53%. Therefore, methoxyfenozide could replace the highly toxic pesticides, used for controlling forest Lepidoptera pests.

---