Abstract
The climbed beans(Phaseolus vulgaris L.) is one of the export vegetables crops with an economic importance. Beans grown in greenhouses highly infested by the two-spotted spider mite, Tetranychus urticae Koch(Acari: Tetranychidae)(TSSM).The present study is to evaluate the field efficacy of three acaricides with or without the predatory mite, Phytoseiulus persimilis Athias-Henriot against T. urticae on climbed beans under greenhouse condition with a reference to the characteristics of growth and productivity. The field study revealed that the acaricides; agnar 20% SC, penny 9% SC and biomectin 5% EC combined with the predatory mite P. persimilis were more effective in controlling TSSM than acaricides or predator mite separately.The acaricide penny or biomectin with P. persimilis as a co-treatment significantly increased vegetative growth and productivity. In addition, the sublethal (LC25) effects of these acaricides on T. urticae females' life-table parameters were studied in the laboratory. All tested acaricides had a significant effect on T. urticae biological parameters such as longevity, total life span, and fecundity. Treatment with agnar, penny and biomectin at LC25,significantly reduced the net reproduction(R0)and gross reproduction (GRR)rates of TSSM females. Consequently, the intrinsic rate of increase (rm) and finite rate of increase(λ)were also affected. In the treated groups and control, the intrinsic rate of increase was 0.129, 0.113, 0.107, and 0.199 female offspring per female per day, respectively. The results showed that the field efficacy of acaricides, as well as sub-lethal effects on TSSM biological characteristics, allow us to obtain a clear image of population level responses to acaricides utilized.
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