Population dynamics of Tetranychus urticae Koch on brinjal crop under north Bihar conditions

Studies were conducted to determine the population dynamics of two spotted spider mite, Tetranychus urticae Koch on brinjal crop under north Bihar condition from March to August, 2012. The mite population appeared initially at lower level with an average of 0.57 mites per cm² leaf area. Population gradually increased from April to June and recorded maximum 6.91 mites percm² leaf area in the first week of June and then sharply declined from 4^th week of June on ward. The relationship between the population of T. urticae and the weather parameters showed significant positive correlation with maximum temperature and significant negative correlation with the relative humidity at 0700 hrs, when the temperature increased the mite population also increased and with increasing relative humidity at 0700 hrs, the mite population decreased