author(s)
Robin Singh, Dilbagh Ahlawat, SS Yadav, Kanika Nagpal and Ankur Chaudhary

abstract
Present study was conducted to determine the effect of nitrogen and potash application on the incidence of Chilo auricilius in differently maturing sugarcane varieties viz., Co 0238, CoH 119 and CoH 150 at Regional Research Station CCSHAU, Karnal during 2015-16. The stalk borer mean per cent incidence, per cent intensity and infestation index was highest (49.56, 16.12 and 8.11, respectively) in Co 0238 while, lowest (33.22, 12.48 and 4.18, respectively) in CoH 150. In relation to nitrogen application, maximum mean per cent incidence, per cent intensity and infestation index (45.44, 15.65 and 7.27, respectively) was recorded at 250 kg N/ha and the minimum (34.44, 13.28 and 4.60, respectively) at 150 kg N/ha. Potash application significantly reduced the mean per cent incidence, lower at 50 kg K₂O/ha (36.96) compared to control. Hence optimum dose of Nitrogen integrated with potassium application significantly reduced the incidence of stalk borer and subsequently, improve cane yield.