Swiss Needle Cast Cooperative Oregon State University


Stimson Lumber Co. Oregon Department of Forestry
Bureau of Land Management Hampton Affiliates, inc.
Green Diaomond Resource Co.
Starker Forests
USDA Forest Service
Menasha Forest Products Corporation
Weyerhaeuser Corporation
Images
Pseudothecia of P. gaeumannii on needles of Douglas-fir (Stone/Hansen Lab)

Pseudothecia of P. gaeumannii on needles of Douglas-fir Pseudothecia of P. gaeumannii on needles of Douglas-fir Pseudothecia of P. gaeumannii on needles of Douglas-fir
Germinating ascospores of P. gaeumannii. (Stone/Hansen Lab)

Germinating ascospores of P. gaeumannii
Foliage loss of infected Douglas-fir trees. (FS 599 SNC presentation, Oregon Department of Forestry)

Foliage loss of infected Douglas-fir trees. Foliage loss of infected Douglas-fir trees.
Visually apparent growth loss on "cookies" of infected Douglas-fir trees. (Oregon Department of Forestry)

Visually apparent growth loss on Visually apparent growth loss on Visually apparent growth loss on
Pocket of infected Douglas-fir surrounded by western hemlock. (Oregon Department of Forestry)

Pocket of infected Douglas-fir surrounded by western hemlock.
Oregon Department of Forestry aerial survey. (Oregon Department of Forestry)

Oregon Department of Forestry aerial survey.
Cross Section of a Douglas-fir needle. Note Interwoven fungal hyphae throughout the needle. (Jeff Stone)

Cross Section of a Douglas-fir needle. Note Interwoven fungal hyphae throughout the needle.
Scanning electron micrograph showing hyphae arising from the peripheral cells of a developing pseudothecium. (Jeff Stone)

Scanning electron micrograph showing hyphae arising from the peripheral cells of a developing pseudothecium.
Ascospores of P. gaeumannii. A-D, Typical ascospores. E. Ascospore 2 germination on water agar. (Jeff Stone)
Ascospores of P. gaeumannii. A-D, Typical ascospores. E. Ascospore 2 germination on water agar.