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FPL 53 - Corky Root Disease

The information accessed from this screen is based on the publication: Sluggett, L. J. 1972. Corky Root Disease of Douglas-fir Nursery Seedlings. Forestry Canada, Forest Insect and Disease Survey, Forest Pest Leaflet No. 53 5p.

Introduction

Corky root disease of Douglas-fir, [( Pseudotsuga menziesii (Mirb.) Franco)], was first observed in British Columbia at the Quinsam Forest Nursery near Campbell River, in 1963. The fungus Cylindrocarpon destructans (Zinnsm.) Scholten and the nematode Xiphinema bakeri Williams are associated with the diseased seedlings, but recent studies indicate the nematode is the "primary" pathogen, and research is now centered on it. The nematode has been found in almost all coastal nurseries of British Columbia and several in Washington and California. Damage assessment surveys showed that 700,000 Douglas-fir seedlings and transplants were ruined at Duncan and Green Timbers nurseries in 1969, and more than 800,000 at the Campbell River nursery in 1971-72.

For more information, see the Corky Root Disease Forest Pest Leaflet in the Canadian Forest Service bookstore.