Home Publications Tree Planters' Notes Tree Planters' Notes Volume 53, Number 1 (2008) Container Western White Pine Seedlings: Root Colonization by Fusarium and Cylindrocarpon Species

Container Western White Pine Seedlings: Root Colonization by Fusarium and Cylindrocarpon Species

James, R. L. Tree Planters' Notes 53(1):23-28. 2009.

Healthy-appearing container seedlings of western white pine were sampled for root colonization by potentially pathogenic Fusarium and Cylindrocarpon spp. at an Idaho forest nursery. Seedlings were sampled monthly for 8 mo with the goal of better understanding epidemiological changes that might occur over time. Fusarium spp., especially F. proliferatum, were present at relatively high levels throughout the seedling production cycle. Cylindrocarpon (mostly C. destructans), however, was not detected until seedlings were 18–22 wk old. Root colonization by Cylindrocarpon remained much less than that by Fusarium spp. Although high levels of Fusarium contaminated seeds before sowing, potentially pathogenic species were mostly detected only at low levels. Cylindrocarpon spp. were detected infrequently on seeds. Very low levels of root disease occurred during the crop cycle. Good root plug condition was common on sampled seedlings; very few seedlings were culled.


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Author(s): Robert L. James

Publication: Tree Planters' Notes - Volumes 53, Number 1 (2008)

Volume: 53

Number: 1

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