Population dynamics of two spotted spider mite tetranychus urticae koch on parthenocarpic cucumber in net house

A field experiment was conducted on parthenocarpic cucumber under net house conditions. during 20162017 and 2017-18, to study the population dynamics of spider mite Tetranychus urticae Koch. The eggs and other active stages were observed, which revealed that egg (21.2 and 25.5 eggs/ ten leaves) and active stages (15.2 and 18.8 active stage/ ten leaves) were at peak during 22^nd and 21^st standard meteorological week, respectively during 2017 and 2018. Correlation coefficients with weather parameters showed a significant and positive relationship between temperature- temp_Max, temp_Min and Temp_Avg having ‘r’ values being 0.55, 0.60 and 0.59, respectively (significant at p= 0.01). Relative humidity (RH_M and RH_Avg) showed significant negative correlation (r = -0.59 and -0.51; significant at p= 0.01). The stepwise regression analysis revealed that Temp_Min was the weather factor responsible in determining abundance of T. urticae and its buildup to the extent of 44%.