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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。
The effects of low dose LC10 and LC30 methoxyfenozide treatment on the fourth instar larvae of Gypsy moth, the development index, the nutrition index and the morphological changes of each development stage were determined by short-term treatment and continuous treatment. The results showed that LC10 and LC30 doses of methoxyfenozide can significantly reduce larvae survival rate, pupation rate, 6th instar insect weight and female pupal weight, compared with the control group, LC30 dose treatment 24h, gypsy moth 5 years And 6th instar larvae. The pupation rate, 6th instar larvae weight and female pupal weight decreased significantly, which were 48.89%, 72.62%, 62.22%, 0.21g and 0.75g, respectively. LC30 dose was more lethal to larvae and pupa The dose of LC10 was obvious, and the treatment of short-term continuous treatment was obvious, the difference was significant (P <0.05). Low doses of methoxyfenozide also had significant effects on larval nutrition indices, LC10 dose inhibited larval relative food intake (RCR), LC30 dose inhibited food utilization (ECI), and both significantly inhibited larval relative growth Rate (RGR) (P <0.05). At the same time, low doses of methoxyfenozide can cause deformity of gypsy moth larvae, with a deformity rate of 62.53%. Description Low-dose methoxyfenozide can replace highly toxic pesticides for the control of forest lepidopterous pests.