Needle Cast, Swiss

Douglas-fir interior needles yellow and drop prematurely from pseudothecia blocking stomates; Christmas trees dry twice as fast. Nothophaeocryptopus gaeumannii is severe in coastal fog zones north of Tillamook, Oregon. Select low-elevation provenances, avoid planting in poor drainage, and thin stands for air circulation in Christmas tree settings.

Silvicultural techniques, such as thinning and vegetation management, have been shown to have no impact on disease severity on forest trees, but will influence stand development and individual tree growth. Cultural tactics combined with chemical management are effective in Christmas tree and nursery settings.