"This USDA website will not be updated during a lapse in federal funding. Content on this website will not be current or maintained until funding issues have been resolved. However, if there is information that affects security, life, and property, this website will continue to update that information during a funding lapse."

Home Publications Tree Planters' Notes Tree Planters' Notes Volume 23, Number 4 (1972) Corky Root Disease Observed On Two Spruce Species and Western Hemlock

Corky Root Disease Observed On Two Spruce Species and Western Hemlock

A root disease of Douglas-fir first observed in coastal British Columbia forest nurseries in 1963 (3), was described and named corky root by Bloomberg (1), in 1968. He implicated the nematode Xiphinema bakeri Williams and the fungus Cylindrocarpon destructans (=C. radicicola) as possible causal organisms. The disease, now prevalent in several coastal nurseries, ruined 700,000 Douglas-fir seedlings in 1969 (3). It was previously thought to be confined to Douglas-fir but has recently been observed on seedlings of Sitka spruce, white spruce and western hemlock 2 growing in X. bake r iinfested nursery soil in experimental seedbeds at Victoria, and on hemlock, at the British Columbia Forest Service nursery at Duncan. It is described here because it has ruined 20 to 50 percent of the seedlings in these limited areas and is a potential threat elsewhere.


Download this file:

PDF document Download this file — PDF document, 383Kb

Details

Author(s): Jack R. Sutherland, L. J. Sluggett, W. Lock

Publication: Tree Planters' Notes - Volumes 23, Number 4 (1972)

Volume: 23

Number: 4

Personal tools