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The two-spotted spider mite Tetranychus urticae Koch is a key pest of many vegetable crops under protected cultivation. The seasonal incidence of two-spotted spider mite on brinjal in four seasons was studied under protected cultivation in 2020 and 2021. Two peaks were observed in mite population during the period of investigation. First peak was observed from mid-September i.e. during 38th and 39th SMW (5.4 to 5.6 mites/2 cm leaf area) to first fort night of October i.e. 40th, 41st and 42nd SMW (5.0 to 5.4 mites/2 cm leaf area), in 2020. Second peak was observed during April i.e. 15th, 17th and 18th SMW (5.0 to 5.8 mites/ 2 cm leaf area) to May i.e. 20th, 21st and 22nd SMW (5.0 to 6.0 mites/ 2 cm leaf area) in 2021. The multiple correlation coefficients between the population and abiotic factors were worked out from July 2020 to June 2021. The active stages were found significantly positively correlated with maximum temperature and non-significantly positively correlated with minimum temperature. The morning relative humidity was non-significantly negatively correlated with the population of eggs and significantly negatively correlated with active stages.
Kumar et al. (Fri,) studied this question.