Thiamethoxam 70 WS was tested as seed treatment @ 2.85 g, 4.28 g and 10g/kg seed along with imidacloprid 70 WS @ 10 g/kg seed, carbosulfan 25 DS @ 50 g/kg seed and soil application of phorate 10 G @ 20 kg/ha against leaf miner and sucking pests of cotton i.e., leafhopper, thrips, aphid and whitefly.  All the insecticidal treatments effectively checked the pest population up to 40 days.  Among the seed treatments, thiamethoxam at higher dose (10 g/kg) was highly effective against leafhopper up to 50 days.  However, at lower doses (2.85 and 4.28g), it gave good control of sucking pests up to 40 days after treatment.   Treatment of cotton seeds with thiamethoxam at 2.85g/kg appeared to be optimum for the control of early sucking pests.