Assessment of Foliage Diseases of Alfalfa in Wyoming

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Abstract
Disease nurseries of standard cultivars were used to assess foliage diseases of alfalfa. One nursery was placed in each of 6 (5 irrigated and 1 dryland) geographically diverse growing areas in Wyoming [USA) and monitored over a 3-yr period. Common leaf spot [Pseudopeziza medicaginis], downy mildew [Peronospora trifoliorum], spring black stem [Phoma medicaginis var. medicaginis] and yellow leaf blotch [Leptotrochila medicaginis] were detected. The first 3 diseases occurred at all irrigated sites except Laramie, where common leaf spot was not found. Yellow leaf blotch occurred at a measurable level only at the dryland site and apparently was the major disease of dryland alfalfa in Wyoming. Diseases detected in nurseries were the same as those found in surrounding commercial fields.

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