Eleven fungicides were evaluated as two foliar sprays for the
management of yellow rust (Puccinia striiformis) at CSKHPKV, RWRC,
Malan. Seven fungicides were tested during both the cropping
seasons whereas, two each were evaluated during 2015-16 and 2016-17.
Tebuconazole 25 EC @ 0.1% was the most effective with mean disease
severity (MDS) of 1.84 % and mean disease control (MDC) of 99.64%
over the unsprayed check (48.39%) followed by Nativo
75WG@0.05%,
Amistar 250 SC, Propiconazole and Amistar Top 325 SC @ 0.1%. The
highest mean grain yield of 32.24 q/ha was recorded in two sprays of
Azoxystrobin 20%+Difenconazole 12.5% SC @0.1% with mean increase
in yield of 56.73% over check with corresponding net profit of Rs. 14815
and cost: benefit ratio of 1: 2.93. It was followed by 32.10, 31.47, 31.18
and 29.65 q/ha yield in Tebuconazole 25% EC, Azoxystrobin 23.1%SC,
Tebuconazole 50%+ Trifloxystrobin 25% w/w 75WG and Propiconazole
25%EC, with mean yield increase of 11.54, 10.91, 10.62 and 9.08 q/ha
with 56.08, 53.01, 51.60 and 44.14 % over the unsprayed check with net
profit of Rs. 16705, 13187, 13384 and 13479 and with corresponding cost:
benefit ratio of 1: 4.03, 1:2.68, 1:2.89 and 1:4.36, respectively. On the
basis of one year data, the highest grain yield of 37.08 and 32.24 q/ha
was recorded in Score 250 EC and Opera @0.1% with 64.80 and 72.96%
increase in yield over check with cost: benefit ratio of 1: 3.53 and 5.38
respectively. Duncan’s Multiple Range Test (DMRT) implied that effect
of years on disease severity was non-significant, all the test fungicides
resulted in significant reduction in disease severity and treatments
Tebuconazole 25% EC, Tebuconazole 50%+ Trifloxystrobin 25% w/w
75WG, Azoxystrobin 20%+Difenconazole 12.5% SC and Azoxystrobin
23.1%SC showed significantly more yield than the other fungicides.
These fungicides may be used against this disease as a short-term
alternative of resistant varieties.
