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Canker diseases of douglas fir seedlings in oregon and washington usa bareroot nurseries



Canker diseases of douglas fir seedlings in oregon and washington usa bareroot nurseries



Canadian Journal of Forest Research 18(8): 1053-1058



Canker diseases in northwestern forest nurseries have been referred to collectively as top blight. To distinguish among the various symptoms and their associated fungi, we made systematic observations of and isolations from Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) seedlings through two crop cycles in four northwestern nurseries, and suspect fungi were subjected to pathogenicity testing. Five diseases were distinguished. Hypocotyl rot, caused by Fusarium oxysporum, kills seedlings during their first growing season. Upper stem canker, caused by Phoma eupyrena and Fusarium roseum, girdles seedlings in midstem in the fall of their 1st year. Lower stem canker, also caused by P. eupyrena and F. roseum, kills seedilngs in the winter or early spring of their 2nd year and is associated with soil collars built up by splashing water. Botrytis and Phomopsis cankers occasionally kill new shoots during the 2nd year. Not all diseases are damaging every year or in all nurseries.

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Accession: 007077603

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