Effect of Different Weather Parameters on Population of Stem Borer, Chilo partellus Swinhoe infesting Rabi Sorghum

Studies on population dynamics of Chilo partellus Swinhoe infesting sorghum was made during 2006–07 and 2007–08 in rabi season at Agricultural Research Station, N.A.U., Tanchha, dist. Bharuch. The incidence of pest begins from fourth week of November(0.06 larva plant ⁻¹) and continued up to first week of February with a peak activity in second and fourth week of December(0.15 larva plant ⁻¹). The abiotic factors, maximum, minimum and average temperature had significant negative association, while humidity, rainfall, rainy days and sunshine hours, wind velocity and evaporation had no significant association with C partellus on rabi sorghum.