Vol. 12, Issue 6 (2023)

Author(s):
Jenita Thokchom, Sanjay Singh Sanasam, Ibohal Singh Khumukcham, Rocky Thokchom, Y Ranjana Devi and Kumar Singh Potsangbam

Abstract:
Scirpophaga incertulas (Walk.) commonly known as Yellow stem borer (YSB), is one of the most destructive pests and field losses are estimated as 5-8% depending on Rice cultivars. A field experiment was conducted at Rice Research Farm, College of Agriculture, CAU, Imphal during the Kharif season, 2020 and 2021. Nineteen certain available rice varieties were tested in the field for their resistance reaction against YSB. Among the entire test varieties, YSB infestation varied from 1.20 to 9.40% Dead Heart (DH) and 1.31 to 7.70% White Ear Head (WEH), which were observed at vegetative and reproductive stages of the crop, respectively. Highest incidence of YSB was recorded on ‘TN-1’ with 9.40% (DH) and 7.70% (WEH), whereas, the lowest incidence was recorded from Phouoibiphou with 1.02% (DH), 1.31% (WEH). The grain yield data revealed that the highest grain yield (8.77 tha^-1) was obtained from the plots of IR-64 as against (2.50 tha^-1) in highly susceptible check variety TN-1. It was closely followed by KD-Awangba with 6.57 tha^-1 and RCM-10 with 6.15 tha^-1, whereas Punshiphou, Ereimaphou and WR-11-4 were recorded low yield with 2.91 tha^-1, 2.86 tha-¹ and 2.68 tha^-1, respectively and showed non-significant difference with the check variety TN-1.