European rhododendron rust (Chrysomyxa ledi var rhododendri), is a disease which can lead to severe defoliation in rhododendrons and deciduous azaleas. The rust also affects it's alternative host, spruce (Picea sp.) and can cause severe defoliation. Symptoms, disease lifecycle, and control are discussed.
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Sept.-Oct. 1987 Vol. 11, Issue 2 Page 10
Gene M. Milbrath Plant Pathologist Oregon Department of Agriculture Salem, OR