Population dynamics of major insect pests of rice and the impact of climatic factors on their population

摘要

The study on effect of different climatic factors on the abundance of major insect pest complex of rice, conducted under field conditions at BHU, revealed that the incidence of stem borer dead hearts (0.85%) was first noticed during the 32~(nd) standard week (SMW) and culminated with a maximum of 9.37 per cent during the 48~(th) SMW. The population of leaf folder was noticed during the 31~(st) SMW with two peaks of 11.55 and 11.92 per cent of leaf damage during the 36~(th) and 39~(th) SMW, respectively. Incidence of ear head bugs noticed during the 31~(st) SMW reached at its peak during the 36~(th) SMW. Data showed a positive correlation with minimum temperature, rainfall and wind speed and a negative correlation with minimum relative humidity. In the current scenario of climate change, it is investable to know the population dynamics of a pest species to manage them in an economically effective manner.