Vol. 11, Special Issue 12 (2022)

Real time pest surveillance was conducted in Cauvery Delta Zone of Thanjavur, Thiruvarur and Nagapattinam District, Thanjavur state in 20 fixed fields of one acre each over 30 villages to analyze the impact of weather on the incidence of insect pests of rice during kharif 2015-2016. Yellow stem borer (YSB), S. incertulas, incidence showed significant positive correlation with minimum and average temperatures, rain fall and wind velocity. Leaf folder (LF), C. medinalis, damage showed significant negative correlation with minimum and average temperatures, evening and average humidity and wind velocity. Rice hispa (RH) D. armigera damage was observed immediately after transplanting and showed positive correlation with rainfall and wind velocity. Brown planthopper (BPH), Nilaparvata lugens population had negative correlation with minimum temperature and average humidity whereas, whitebacked planthopper (WBPH), Sogatella furcifera incidence was negatively correlated with maximum temperature. The gundhi bug was significantly and negatively correlated with minimum temperature and wind velocity.