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Disease on trolius - Ask Extension

I am wondering if you could tell me what this might be on my trolius. I haven’t seen it before and this is the only plant it is on. Thankyou

This work is supported in part by New Technologies for Ag Extension grant no. 2020-41595-30123 from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.