Studies conducted at the Regional Agricultural Research Station, Raichur, Karnataka during 2001-02 season indicated that, in irrigated crop, infestation started in first week of December  with its peak incidence during first week of April. In dry land cotton the incidence was  noticed during third week of January with peak incidence by the end of March. Maximum and minimum temperature recorded positive and significant relation and they influence the population to the extent of 81.9 and 75.4 per cent  respectively, whereas, relative humidity showed negative and significant relationship. Among the different insecticides, botanical and insect growth regulator evaluated for their efficacy, monocrotophos 36 SL at  700 g. ai. per ha, carbaryl 50% WP at 2000 g. ai. per ha  and acephate 75 SP at 750 g.ai. per  ha. were found more effective followed by chlorpyriphos 20 EC at 500 g. ai. per ha and quinolphos 25 EC At 500 g.  ai. per ha against Dusky cotton bug.