Sunday, April 19, 2009

Landscape and Nursery - Needlecast Disease Pictures

The following are pictures of two needlecast diseases of evergreens being found in Delaware at this time.

Close-up view of Douglas-fir needles showing symptoms of infection with Douglas-fir needlecast fungus (Rhabdocline pseudotsugae). Photo by Mike Schomaker, Colorado State Forest Service,

Rhabdocline needlecast. Photo by John W. Schwandt, USDA Forest Service, Rhabdocline apothecia are released when flaps of leaf epidermis fold back on either side of the midrib.

Symptoms of Rhizosphaera needle cast, which can be a component of the spruce decline syndrome. Photo by Joseph O'Brien, USDA Forest Service,

Rhizosphaera needle cast close up of infected needles with pycnidia (top) and healthy needle (bottom). Photo by Michael Kangas, NDSU - North Dakota Forest Service,

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