Impact of Abiotic Factors on the Incidence of Insect Pests in Rice

The investigation on impact of abiotic factors on incidence of insect pests in rice was carried out during Kharif 2021. The highest and lowest Rice Yellow Stem Borer incidence was recorded at vegetative stage in the form of dead heart at 31st Standard Meteorological Weeks (SMW) and 40th SMW and it was 16.48% and 1.10%, respectively, whereas at reproductive stage the highest and lowest incidence was recorded in the form of white ear at 42nd SMW and 41th SMW i.e., 18.12% and 16.75%, respectively. The highest Rice leaf folder incidence was recorded in 36th SMW (16.25%) and lowest in 44th SMW (1.31%). The highest and lowest Rice Gundhi bug mean population was recorded in 39th SMW (10.30 bugs/hill) and 44th SMW (1.31 bugs/hill). The highest and lowest Brown Plant Hopper (BPH) mean population was recorded in 38th SMW and 41st SMW and it was10.80 BPH/hill and 1.60 BPH/hill, respectively. The yellow stem borer showed significant positive correlation with relative humidity whereas, non-significant positive correlation with minimum temperature, maximum temperature, rainfall and sunshine. Rice leaf folder population showed significant positive correlation with minimum temperature and relative humidity. Whereas, positive and non-significant correlation with maximum temperature and rainfall. However, negative and non-significant correlation with sunshine. Gundhi bug showed a non-significant positive correlation with Relative humidity, Rainfall and sunshine. However, negative and non-significant correlation with minimum temperature and maximum temperature. BPH population showed significant positive correlation with minimum temperature and relative humidity, however positive and non-significant correlation with maximum temperature and rainfall. Whereas, negative and non-significant correlation with Sunshine.