IMPACT OF RESISTANCE IN DIMINUTION OF INFECTION AND QUANTITATIVE LOSSES CAUSED BY KARNAL BUNT (NEOVOSSIA INDICA) IN BREAD WHEAT (TRITICUM AESTIVUM L.)

Abstract

Reaction of Neovossia indica in bread wheat, with particular reference to the role of resistance in minimizing its
infection and quantitative loss caused by it, were observed with virulent isolate of Neovossia indica in a set of
population. Whole set of population consisted of resistant parents (HD 29, Lok 1 and Raj 3777), susceptible
parents (WL 711, UP 262 and UP 2425), F1, F2 and backcross (BC1 and BC2) generations. F1 was derived from
crossing between resistant and susceptible parents in half diallel fashion. Maximum percent infection i.e., 17.9%
was recorded in the susceptible parent i.e, WL 711, which resulted in 4.65 % (maximum) grain yield loss, while
only 0.86 % (minimum) infection resulted in 0.22% grain yield loss was recorded in the back cross generation
of the cross Raj 3777/ Lok-1 (resistant x resistant). However, overall 6.0 % percent infection and grain yield loss
1.49% was recorded by all generations. The present study reveals good scope for resistance breeding in minimizing
the percent infection and ultimately yield loss due to infection of Karnal bunt