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and min.) was positively correlated and sunshine hours were negatively correlated. and min.) while, positively correlated with sunshine hours, but during November planting relative humidity (max. and min.), rainfall and relative humidity (max.

Whitefly population were negatively correlated with temperature (max.

Simple regression value reflects whitefly population were influenced to the tune of 70.8%, 69.5%, 35.3% and 75.4% in November, December, January and February month respectively. The most favourable temperature was ranged in respect of min. Maximum temperature beyond 35☌, minimum temperature below 8☌ and moderate to high rainfall was very much detrimental to successful population build up. Maximum population were recorded in the month of February depending on the growth stage of the crop. It was found that number of population were above ETL during the month of December, January and February. During November planting mean whitefly population were highest (6.9 whiteflies per 3 leaves) and slowly declined in successive planting dates. Whitefly started to infest cotton soon after planting in favourable weather condition.

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