Vol. 7, Issue 1, Part B (2025)

Field experiment was carried out at the Entomology Laboratory, Agricultural College and Research Institute, Vazhavachanur, Thiruvannamalai, Tamil Nadu, India during Rabi 2020 and to study the efficacy of insecticides with specific mode of action against thrips and whitefly in castor. The experiments were conducted with completely randomized block design along with ten replications. Minimum mean population of thrips 4.48/plant was recorded after two spraying of Buprofezin 25 SC @ 0.8 ml/lit of water whereas untreated check recorded 39.65 thrips/plant with a mean population reduction of 88.70 per cent over untreated control plot. Similarly, Buprofezin 25 SC @ 0.8 ml/lit recorded a lowest mean population of whitefly as 8.30/plant with a mean population reduction of 87.84 per cent over untreated control followed by Profenophos 50 EC @ 2 ml/lit and Azadirachtin 1% with a mean population reduction of 78.76 and 46.58 per cent respectively over.