Pooja POOJA, Satyavir Singh DHANDA, Virender Singh PAHIL, Rishi Kumar BEHL

Evaluation of Bread Wheat (Triticum aestivum L.) Genotypes for Yellow Rust Resistance in Relation to Meteorological Parameters

Three bread wheat varieties (Triticum aestivum L.), i.e., HD 2967, WH 711 and PBW 343, were grown in randomised block design with four replications under field conditions over two years in winter season at wheat and Barley Research farm, at CCS Haryana Agricultural University Hisar to evaluate the stripe rust severity in relation to meteorological factors like minimum and maximum temperature (°C) and relative humidity (%), rainfall (mm), soil temperature (°C), canopy temperature (°C), cloud cover (Okta), wind speed (km/h), sunshine hours (h/day) and morning and evening vapour pressure (mm Hg). Observations were recorded on five randomly selected plants in each replication on stripe rust severity as percent leaf area covered using Modified Cobb’s scale. Results revealed that low temperature (10-12°C) and high relative humidity (90%) along with intermittent rainfall were found conducive for the onset of stripe rust. Low temperature and moderate humidity favored the disease initiation and development. At the initiation of disease, the severity was more in PBW 343 (0.68%) followed by WH711 (0.59%) during first SMW whereas HD 2967, exhibited disease initiation during 2nd SMW with 2.19% severity. Disease progression was also different in different wheat varieties. Disease gradually advanced with the crop age, and increased sharply from 15.00 to 38.00% in HD 2967, 27.50 to 46.00% in WH711 and 35.00 to 43.6% in PBW 343 during 6-8th Standard Meteorological Week, when the crop was at stem elongation to jointing stage, i.e., GS 36-47 (64-78 DAS). Yield loss due to disease severity was estimated to be 356 kg/ha, 690 kg/ha and 400 kg/ha in wheat varieties HD2967, WH711 PBW343, respectively. Step-wise multiple regression showed high R2 value of 0.885, 0.919 and 0.952 for the predictive model of stripe rust in HD 2967, WH 711 and PBW 343, respectively

Keywords:

Stripe rust, bread wheat Triticum aestivum L., temperature, rainfall, relative humidity,

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