Sucking pests have become a serious problem in Bt cotton. The cotton aphid and mealybug reduces its yield to the extent of 30-40 per cent and 40-50 per cent, respectively. In this context an investigation was carried out on synthesis of silica nanoparticles from rice husk and its impact against cotton aphid and mealybug during 2017-18 at centre for nanotechnology lab, UAS Raichur. For comparison purposes, metal silica nanoparticles and dinotefuran 20% SG was used as an insecticide. | Biosynthesis of green silica nanoparticles and its effect on cotton aphid aphis gossypii glover and Mealybug Phenacoccus solenopsis Tinsley