Field experiments was conducted during kharif season 2014-2015 to study the influence of meteorological factors on the incidence of major pests of cotton. Incidence of aphids was initiated in 32nd MW (35.0/ leaf) and aphid population was lowest in 42nd and 43rd MW (0.2/ leaf). It has attained its initial peak during 32nd MW (35.0/ leaf) which was favored by min. temp. of 31.99oC and max. temp. of 33.59oC with morning 95.86 % and evening 78.86 % humidity along with 10.0 mm rainfall. Incidence of leaf hoppers was initiated in 34th Mw (0.2/ leaf) and thereafter continued up to 42ndmw with disappearance in 43rdand 44th MW. It reached its peak during 36th MW (0.9/ leaf) which was favored by min. temp. of 31.87oC and max. temp. of 33.27 oC with morning 96.71 % and evening 87.43 % humidity along with 60.60 mm rainfall. Incidence of thrips was initiated in 33rdmw (0.2/leaf). It was at its peak during 36th MW (0.6/leaf) which was favored by min. temp. of 31.87oC and max. temp. of 33.27 oC with morning 96.71 % and evening 87.43 % humidity along with 60.60 mm rainfall. Incidence of whitefly was first observed in 32nd MW (5.8/ leaf). It was at its peak during 32nd MW (5.8 Nymph/leaf ). The meteorological parameters were in range of min. temp. of 31.99 oC and max. temp. of 33.59 oC with morning 95.86 % and evening 78.86 % humidity along with 10.0 mm rainfall during 32nd MW. Incidence of mite and mealy bug was not observed on cotton during the growing season. Predator activity was observed throughout the season form 32nd MW to 48th MW. Population of lady bird beetle was at its peak during 33rd MW (5.5/ plant) with meteorological parameters in the range of min. temp. of 31.90 oC and max. temp. of 34.16oC with morning 93.71 % and evening 68.57 % humidity along with 2.2 mm rainfall. Chrysopa population was not observed on cotton during the growing season. Population of spider was at its peak during 36th MW (0.4/Plant) during which meteorological parameters in the range of min. temp. 31.87oC and max. temp. of 33.27oC with morning 96.71 % and evening 87.43 % humidity along with 60.60 mm rainfall. Boll worm and red cotton bug damage was not observed on cotton during the growing season.

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