USDA Forest Service

Pacific Southwest Research Station

Pacific Southwest
Research Station

1731 Research Park Dr.
Davis, CA 95618
(530) 759-1700
United States Department of Agriculture Forest Service. USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.


Germination and early infection stages of basidiospores of C. ribicola
on sugar pine needle. Fluorescent illumination.
Basidiospores and germ tubes on surface of pine needle. Section of pine needle at a stomate, showing infection structures. Hypersensitive (resistant) reaction .