Sublethal effects of dinotefuran on the biological parameters of the wheat aphid Schizaphis graminum and its predator Hippodamia variegata

Articles in Press

Document Type : Research Paper

Authors

Department of Entomology, Shi. C., Islamic Azad University, Shiraz, Iran

Abstract

The effects of sublethal concentrations of the insecticide dinotefuran on the biological parameters of the wheat aphid and the ladybird Hippodamia variegate Goeze were investigated under laboratory conditions (temperature 26±2 °C, relative humidity 65±10%, photoperiod of 16:8 h L:D). The LC50 values indicated that the toxicity of dinotefuran on the aphid (219.75) is greater than on the ladybird (747.4), which also applies to the LC10 and LC30 values. The development period of aphid nymphs increased in the sublethal treatments. Adult aphid longevity was shortest in the LC30 treatment (11.33 days), and the adult pre-oviposition period (APOP) and total pre-oviposition period (TPOP) values at LC30 were the shortest (0.66 days) and the longest (8.53 days), respectively. Dinotefuran at LC10 had no significant effect on the lifespan of adult ladybird. APOP values at LC10 and LC30 did not differ significantly on ladybird, but TPOP at LC30 was higher than in the other treatments. Aphid's intrinsic rate of increase (r) decreased from 0.374 in the control to 0.219 in LC30 and R0 decreased from 47.37 to 13.37. With increasing concentration, age-stage-specific survival rate of the aphid declined, while in the ladybird, individuals treated with LC10 had higher survival than those at LC30. The reproductive rate of aphids decreased at sublethal concentrations, while the highest age-specific fecundity value (mx) for the predator was observed in the control group. The total effect index indicated that, according to IOBC classification, dinotefuran at both sublethal concentrations is harmless. Based on the findings, sublethal concentrations of dinotefuran can be used in integrated management programs for aphids in conjunction with the ladybird

Keywords

Plant Pest Research

Articles in Press, Accepted Manuscript
Available Online from 23 September 2025

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History

  • Receive Date: 15 August 2025
  • Revise Date: 21 September 2025
  • Accept Date: 22 September 2025

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