Bioefficacy studies were carried out at Agricultural Research Station, Dharwad, for sucking pests of cotton with BY1 08330 150 OD (spirotetramat 150 OD) and SYN 13623 a combiproduct of thiomethoxam 141 SC+lcyhalothrin 106 SC. The population of thrips, leafhoppers and aphids was brought below ETL with   three sprays during 2006 and two sprays in 2007 with different dosages of new chemicals. Significantly highest seed cotton yield of 20.32q/ha (2006) and 29.22 q/ha (2007) was harvested with higher dosage of SYN 13623 @ 300ml/ha and BY1 08330 150 OD @500ml/ha respectively proving them to be on par with acetamiprid 20 SP, a standard check.