Enrico, would you post this question to the forest path list?
I received a sample of pitch-loblolly pine (Pinus rigida x taeda) which was planted last spring, plants are about 12-15 inches tall. It appears to have a needle disease, either a spot or maybe a needlecast. My first thought upon seeing
the sample was a rust, but microscopic appearance does not seem right to me.
The spots are bright yellow-orange around an apparently acervular fruiting body. I do not recognize this fungus and am not finding it in my usual conifer references. In some of my slides I saw some spermatia-like spores but this is definitely not a pycnidium
and so not Phyllosticta. The rounder spores are somewhat variable in size.
Has anyone from the areas where pitch and loblolly pines are native seen this?
Nancy J. Taylor, Director
C. Wayne Ellett Plant and Pest Diagnostic Clinic
Ohio State University
8995 E. Main St., Bldg 23
Reynoldsburg, OH 43068-3399
Phone: (614) 403-1640
FAX: (614) 466-9754
Email: taylor.8@osu.edu
http://ppdc.osu.edu
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