Vol. 11, Issue 12 (2022)

Author(s):
Rajesh Kumar, Bansidhar, UK Singh, RK Mandal and VK Choudhary

Abstract:
Cochliobolus miyabeanus (Anamorph: Bipolaris oryzae (Breda de Haan) Shoemaker, 1959 (Synonyms: Helminthosporium oryzae) is the causal organism for brown spot disease in rice and is responsible for significant economic losses as it results in loss of both grain quality and yield. Though, it is a minor disease in most of the parts of the world but the historical famines like Krishna Godaveri Delta famine and Bengal famines and huge crop losses in a number of incidences as in Guyana and Nigeria renders. It as a potential threat to rice crop and adverted the requirement of efficient, sustainable and economical strategies to cope with the pathogen. In this context, availability of resistant sources against the pathogen is a noteworthy alternative for disease management. Keeping this in view the present investigation was undertaken to study association between resistance to brown spot disease and yield related traits in rice via correlation and path analysis to identify high yielding resistant lines for brown spot disease in rice. In this study disease resistance expressed in terms of AUDPC (Area under the disease Progress Curve) showed negative correlation with yield and yield attributing traits and direct negative effect on yield. Thus, AUDPC could be used as a selection parameter of developing improved cultivars with higher grain yield and lower susceptibility towards the brown spot pathogen.