Abstract
To better understand the sublethal effects of cyantraniliprole on the black cutworm Agrotis ipsilon (Lepidoptera: Noctuidae), several studies were carried out to investigate sublethal effects on development stages, population parameters, feeding indices and nutrient content of A. ipsilon. The result of a bioassay showed that cyantraniliprole had high toxicity against A. ipsilon fourth-instar larvae with an LC50 of 0.354 μg.g−1 using an artificial diet. Compared with controls, sublethal doses of cyantraniliprole at LC5, LC20 and LC40 levels prolonged larval and pupal duration and extended mean generation time and total preovipositional period. In addition, survival rate, reproductive value, intrinsic and finite rates of increase and net reproduction rate declined significantly. Meanwhile, cyantraniliprole had markedly antifeedant effects; decreased the relative growth rate (RGR), the relative consumption rate (RCR), the efficiency of conversion of ingested food (ECI), the efficiency of conversion of digested food (ECD); and increased the approximate digestibility (AD) significantly. This phenomenon contributed to the decrease of nutrient contents, including lipids, protein and carbohydrates, to the point that insufficient energy was available for normal growth. Therefore, sublethal concentrations of cyantraniliprole decreased growth speed and reduced population reproduction of A. ipsilon. This result provides information useful in integrated pest management (IPM) programs for A. ipsilon.
Highlights
The black cutworm Agrotis ipsilon (Lepidoptera: Noctuidae) is a polyphagous pest that occurs worldwide and can destroy more than one hundred types of crops [1]
Three sublethal concentrations all significantly prolonged the duration of larvae after treated by cyantraniliprole in fourth instar compared with the control
The duration of pupae at LC5 (17.63 days), LC20 (17.79 days) and LC40 (17.67 days) was significantly longer than that of the control (16.37 days), but no significant difference was found between the three treatments
Summary
The black cutworm Agrotis ipsilon (Lepidoptera: Noctuidae) is a polyphagous pest that occurs worldwide and can destroy more than one hundred types of crops [1]. New insecticides with unique modes of action are required as an alternative for an integrated A. ipsilon management program. Cyantraniliprole is a novel anthranilic diamide insecticide. It targets the ryanodine receptors in insect muscles and affects control of calcium channels [4,5]. Anthranilic diamide insecticides exhibit a good selectivity to non-target arthropods and outstanding mammalian safety, along with exceptional safety on avian and aquatic organisms[5], making it very suitable for use in integrated pest management (IPM) programs. Du et al showed that cyantraniliprole has shown high insecticidal activity against A. ipsilon third instar larvae [3]
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