Population dynamics of two spotted spider mite, Tetranychus urticae Koch on French bean (Phaseolus vulgaris L.)

Studies on population dynamics of T. urticae on French bean cv. GUJARAT RAJMAH revealed that the two spotted red spider mite remained active throughout the crop season in open field condition. The incidence of T. urticae was started from the 1st SMW (first week of January), increased gradually and reached to its peak during 21st SMW (mid of May) (14.27 mite/leaf) in the open field condition. The maximum, minimum, average temperature, evening and average relative humidity had significantly positive correlated with mite population, while morning relative humidity had nonsignificant correlation with T. urticae population.