Lethal and sublethal effects of thiacloprid on Schizaphis graminum (Rondani) (Hemiptera: Aphididae) and its predator Hippodamia variegata (Goeze) (Coleoptera: Coccinellidae)

Abstract

Lethal effects of thiacloprid were determined on Schizaphis graminum (Rondani) and Hippodamia variegata (Goeze) at 27 ± 1 °C, 65 ± 10% RH, and 16:8 (L:D) h. The effect of sublethal concentrations (LC₁₀ and LC₃₀) was estimated by the International Organization for Biological Integrated Control (IOBC). The LC₅₀ values of thiacloprid for H. variegata and S. graminum were 730.3 and 212.7 mg a.i.L⁻¹, respectively. Both tested sublethal concentrations negatively affected the demography of H. variegata and S. graminum. The LC₃₀ treatments had a higher negative effect on demographic parameters of both tested insects compared to the LC₁₀ one. Based on the IOBC classification, the LC₁₀ and LC₃₀ treatments were found to be harmless for H. variegata and slightly harmful for S. graminum. Therefore, thiacloprid can be suggested to be used in cereal fields where S. graminum and its predators are active.

Keywords:

• Life history
• demographic parameters
• Hippodamia variegata; Schizaphis graminum
• IOBC
• thiacloprid

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