In vitro study on toxicity of hexythiazox against Panonychus ulmi Koch (Acari: Tetranychidae) on apple plants

Abstract

The effect of hexythiazox at different concentrations on apple plants in terms of LT50 values against Panonychus ulmi was studied in the present investigation. Graded response bioassays were performed with different concentrations of hexythiazox to evaluate this important parameter against Panonychus ulmi. Bioassays were performed in the laboratory to establish the persistence of 50% kill of mites i.e. LT50 values on apple plants. It was established that the LT50 value was 1.44 days at the concentration of 0.001%, while it was 2.34 days at the concentration of 0.002% and the LT50 value was highest at the concentration of 0.004% with a value of 3.69 days. The period of effectiveness of killing 50% mite population by hexythiazox reveals how far this pesticide is effective in causing a good/ effective control of mite pests.