Study on biology of rice yellow stem borer

Abstract

The experiment was conducted at Students’ Instructional Farm of Acharya Narendra Deva University of Agriculture and Technology, Kumarganj, Ayodhya during Kharif, 2015 and 2016. The mean length (mm) 2.0 ± 0.12 &1.8 ± 0.10 and mean head capsule width (mm) 0.2± 0.01 & 0.3 ± 0.02 were recorded during Kharif, 2015 and 2016, respectively. The mean incubation periods of 6.2 ± 0.36 and 6.5 ± 0.38 days were recorded in the year Kharif, 2015 and 2016, respectively. The mean total larval period was 27.5 ± 1.66 and 28.9 ± 1.72 days was recorded during Kharif, 2015 and 2016, respectively. The average pupal period was 8.6 ± 0.51 days and 8.9 ± 0.53 days was recorded. The mean duration of male adult 2.6 ± 0.15 days and 2.8 ±0.16 days of female was recorded during Kharif, 2015, respectively. The mean duration of male adult 2.7 ± 0.22 and female adult 2.9 ± 0.17 days was recorded during Kharif, 2016, respectively. The pre-oviposition, oviposition and post oviposition period of 1.0 ± 0.06, 1.5 ± 0.08 and 1.0 ± 0.07 was recorded in Kharif, 2015 and 1.3 ± 0.07, 1.7 ± 0.09 and 1.2 ± 0.05 in Kharif, 2016. The average total life cycle of Scirpophaga incertulas was 42.3± 3.54 days and 44.3 ± 3.61 days in Kharif, 2015 and 2016, respectively.