Vol. 10, Issue 8 (2021)

Author(s):
Abhishek Kumar, Archana Kerketta, RKS Tomar, DJ Sharma and NK Chaure

Abstract:
Transplanting of six varieties (NDR-359, KARMA MAHSURI, CR-3969-24-1-2-1-1, HRI-174, PHI-18104 and CHANDRAHASINI) was done 31^st July 2020 during Kharif season for investigate the seasonal incidence of rice stem borer, Scirpophaga incertulas (Wlk) on different varieties of paddy. Dead heart started from 36^th SMW and continued upto 41^st SMW, while white ear head was recorded on 41^st SMW and reached peak in 42^nd SMW. On the basis of peak infestation period, the maximum dead heart was recorded on CR-3969-24-1-2-1-1 (32.59%) while minimum dead heart was found in Karma Mahsuri (10.66%) variety of paddy. The white ear head per cent was ranged from 2.93% to 11.94%. The findings demonstrated that climatic conditions had no statistically significant relationship with the percentage of dead hearts and white ears. Temperature, relative humidity, rainfall, and sunshine hours had little bearing on the stem borer infestation and the manifestation of symptoms such as a dead heart and white ear head.