Reaction of Wheat Varieties to Rust Diseases at Mid and Low Altitudes in Bhutan

AUTHORS: Sangay Chophel, Namgay Om, Thinlay, Yeshey Dema & Ugyen Yangchen


Wheat rusts are the important fungal diseases that limit the production and downgrade wheat grain quality. This study was conducted to determine the reaction of wheat varieties to rust diseases at different altitudes. Field experiments were conducted from December 2016 to March 2017 at Mendagang for mid altitude (1332 masl) and at Samtenling for low altitude (378masl). The experiment followed a randomized complete block design with three replications and 15 varieties. Of the 15 varieties three were from Bhutan, eight from SAARC, and four from ICARDA. Disease assessments were performed approximately at 60, 90 and 120 days after sowing following the modified Cobb’s disease rating scale. Only leaf rust was observed at both the sites and all 11 germinated varieties were evaluated. Leaf rust incidence ranged from 2.5 to 10% and 2.5 to 16% at mid and low altitudes respectively. Disease severity of 5 to 20%, corresponding to field response of immune to moderately resistant was observed at mid altitude; while 5 to 100%, with immune to susceptible was observed at low altitude. There was a significant difference in disease incidence by site (p=.038) but not in disease severity (p=.129). The disease severity was positively correlated (r=.359); (r=.034) with mean minimum and maximum temperature respectively and (r=.361) with mean minimum relative humidity. Correlation was highly significant (p=0.003).This study found variety ICARDA 1, with 100% severity as highly susceptible to leaf rust at low altitude while Bajosokha Kaa remained immune in both the sites. The results indicate that leaf rust can occur in both low and mid altitudes; however, selection of suitable leaf rust tolerant varieties requires more extensive studies.

Keywords: Altitude, Resistant, Rust, Severity, Susceptible, Temperature, Relative humidity




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