Efficacy of some Acaricides Against Tetranychusurticae Koch on Phaseolus vulgaris Plants

Overcoming the bulk of the challenges posed by using ordinary pesticides necessitates employing developed, safe, distinctive, and selective chemicals.Because of their clear mechanism of action on pests and lower toxicity to vertebrates than traditional pesticides, the effects of the new reducedrisk acaricides abamectin, fenpyroximate, and chlorfenapyr against the two-spotted spider mite, Tetranychus urticae Koch, were evaluated under laboratory and field conditions.The effects on development and life table parameters were also studied under laboratory conditions.Abamectin was the most toxic to T. urticae females, followed by fenpyroximate and chlorfenapyr with LC 50 values of 0.01, 19.86, and 29.66 mg a.i./L, respectively.Under field conditions, abamectin, fenpyroximate, and chlorfenapyr, respectively, caused a significant difference in the mean reduction percentage of T. urticae on Phaseolus vulgaris in 2020 (92.83, 86.57, and 80.43); nevertheless, in 2021 the differences were not significant (86.85, 80.38, and 76.13).Fenpyroximate-treated females had the highest egg, total immature, and postoviposition durations.Females treated with abamectin showed the longest durations of deutonymph, preoviposition, and female longevity.Chlorfenapyr was the most effective in reducing the net reproductive rate, intrinsic rate of natural increase, finite rate of increase, and female sex ratio.The present study revealed that these acaricides (abamectin, fenpyroximate, and chlorfenapyr) can alternatively be used for effective and sustainable management of the mites.