Population dynamics of insect-pests of paddy and its correlation with weather parameters

This paper discusses the population dynamics of paddy and its correlation with weather parameters in Faizabad district of U.P. Occurrence and abundance of insect-pests of paddy on rice crop was monitored on rice variety Sarju-52 at Main Experimental Station of Narendra Deva University of Agriculture and Technology Kumarganj Faizabad (U.P.) during the season kharif, 2013. This investigation revealed that pest activity commenced from 35th Standard meteorological week (SMW) and continued to 49th SMW. Highest dead hearts (8%) of Yellow Stem Borer, Scirpophaga incertulas was found in the 38th SMW, the maximum population (2.40%) of Rice Hispa was recorded in the 36th SMW, the peak population of whorl maggot (2.50%) was estimated in the 42nd SMW. The highest population of the rice leaf folder and gundhi bug with 3.70% and 21.90% was found in the 40th and 43rd SMW, respectively. Yellow stem borer was positively correlated with sunshine hours and rice hispa with maximum temperature was found positively significant. The rice whorl maggot was positively non-significant with the maximum temperature, there were no negative correlations of rice leaf folder and rice gundhi bug was positively correlated with relative humidity.