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

V L MONICA, ANIL KUMAR, HARI CHAND, SUDHIR PASWAN, KUMAR SANJEEV

Abstract


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 cm leaf area. Population gradually increased from April to June and recorded maximum 6.91 mites per cm 2 2 leaf areain the first week of June and then sharply declined from 4 week of June onward. 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


Keywords


Brinjal; Tetranychus urticae; weather parameters

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