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Alfalfa Alert service provided by TVpestalert.net.
June 21, 2010 Alfalfa Magic Valley - Idaho
Downey Mildew on Alfalfa was observed in the Rupert area. Cool and humid conditions are conducive to the development and spread of Downy Mildew. Initial symptoms include chlorotic tissue either as localized areas on leaflets or entire leaves and stems if infection is progressing. Infected leaves can show symptoms of twisting and/or curling of the leaf margin. Lower leaf surfaces will show white to pale violet down growth. Fungus needs near 100% relative humidity to reproduce and is spread primarily by wind and splashing rain. Disease cycle can be repeated every 5 days depending on environmental conditions. Please consult the PNW handbook pdf below for control alternatives.
This information was provided by UI Extension Plant Pathologist Dr. Oliver Neher.
Posted By: Jerry Neufeld
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