author(s)
Naveen, Purti and Dilbag Singh Ahlawat

abstract
At research farm of Regional Research Station, Uchani, Karnal, CCS Haryana Agricultural University, Hisar during year 2017-18, an experiment was conducted to evaluate the effect of duration of varieties of sugarcane on the incidence of shoot borer, Chilo infuscatellus Snellen, top borer, Scirpophaga nivella Walker and stalk borer, Chilo auricilius Dudgeon in three differently maturing sugarcane varieties CoH 160 (early maturing), CoH 167 (mid maturing) and CoH 150 (late maturing). Results revealed that the incidence of shoot borer was maximum (7.14, 12.03 and 5.37%) in CoH 160 and the minimum (3.45, 4.81 and 2.96%) in CoH 167 during April, May and June, 2017, respectively. Similarly, incidence of top borer was highest (8.66, 10.88 and 12.22%) in CoH 160 and lowest (3.55, 5.11 and 6.44%) in variety CoH 167 during July, August and September, respectively. The mean per cent incidence, per cent intensity and infestation index of stalk borer was recorded maximum (36.00, 16.22 and 5.96, respectively) in CoH 160 and minimum (29.55, 12.16 and 3.68, respectively) in CoH 150. Cane yield (t/hac), No. of millable canes (000’/hac) and commercial cane sugar per cent were also recorded during the experiment.