MAHENDRA PAL*, R. SWAMINATHAN AND O. P. AMETA

A field experiment to record the seasonal incidence of sap sucking insect pests of cotton was carried out during May to November, 2012 at the Instructional Farm, Rajasthan College of Agriculture, Udaipur (Rajasthan). The study revealed that the incidence of sap sucking insect pests started at 26th SMW and the peak population of aphids (52.80 aphids/plant) and thrips (41.60 thrips/plant) was recorded in 41st and 40th SMW, respectively; whereas, the population of jassids and whitefly reached the peak with mean 19.80 jassids /plant and 31.87 whiteflies/plant during the 31st and 30th SMW, respectively. The jassid and whitefly population was significantly and positively correlated to mean atmospheric temperature and mean relative humidity. Aphid population was positively correlated to mean atmospheric temperature and mean relative humidity. The mean relative humidity had significant positive correlation with the population of thrips.