Chari, M. S.KABARIA, BABU B.2018-07-102018-07-101982http://krishikosh.egranth.ac.in/handle/1/5810058735To evaluate the bio-efficacy of some insecticides against insect pests of Hybrid-4 cotton, an experiment was conducted for two years during 1980-81 and 1981-82. The first trial was conducted during 1980-81 with the following treatments viz. Phenthoate-EC (Elsan, 50 EC, 1.625 l/ha), endosulfan (Thiodan, 35 EC, 1.5 l/ha), chlorpyriphos (Damisban, 20 EC, 1.25 l/ha), carbaryl (Sevin, 50 wp, 2 kg/ha), phenthoate-D (Elsan, 2% dust, 31 kg/ha), diazinon (Bazanon, 20 EC, 1 l/ha), monocrotophos (Nuvacron, 40 EC, 1.5 l/ha) and control (water spray only). Seven spraying were given at an interval of 15 days. The results on sucking insect pest complex showed that monocrotophos gave excellent protection to the crop from aphids, jassids and thrips.enAGRICULTURAL ENTOMOLOGY, AGRICULTUREA STUDYThesis