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Home → Publications → National Nursery Proceedings → 1978 → The establishment of mycorrhizae using excised roots as inocullum

The establishment of mycorrhizae using excised roots as inocullum

The Forest Service nursery at McKinleyville, California (Humboldt Nursery) has lost more than 6 million 1-0 Douglas-fir seedlings since 1971. These losses were caused by a fungus Phoma sp., that generally killed all the foliage on the seedlings that were 1 to 3 inches tall at the end of the first growing season. Taller seedlings were attacked but usually survived attacks of this disease, since only the lower foliage was affected. The reason that many of the seedlings were so smaller was the lack of mycorrhizae. Therefore in 1976 tests were conducted at Humboldt Nursery to determine if introducing mycorrhizal infected roots into seed bed would result in early and increased mycorrhizal infection of seedlings and corresponding increase in seedling height growth the first growing season.


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Author(s): Michael D. Srago

Publication: National Nursery Proceedings - 1978

Event: Nurseryman's conference and seed processing workshop
1978 - Eureka, CA