Abstract
The maximum population of Lipaphis erysimi were recorded in 8th standard week (80.00) of February on mustard crop when average atmospheric temperature was 21.4°C, relative humidity 66% and rainfall 6.0 mm. The population was slowly decline and reached zero in13 standard week of month of March when average maximum temperature 26.90 °C, average maximum relative humidity 46.5%, average maximum rainfall 3.0 mm. The aphid population showed a nonsignificant negative co-relation with maximum temperature while minimum temperature relative humidity rainfall showed a non-significant positive correlation.
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