Abstract
Abstract Cylindrocarpon root disease can destroy root systems of container seedlings. Foresters were concerned that infected nursery stock would perform poorly after outplanting. Root growth potential tests were a poor predictor of disease levels on seedlings that otherwise met standard morphological criteria (height, stem diameter, and firm root plugs) for outplanting. Cylindrocarpon on western white pine persists longer on outplanted stock than Fusarium oxysporum or F. proliferatum on Douglas-fir seedlings on a similar site. Mortality caused by herbivores was as serious a threat to plantation establishment as was mortality caused by all other factors. Our results suggest that western white pine seedlings infected with Cylindrocarpon, but meeting morphological criteria for outplanting, will perform satisfactorily in the field. West. J. Appl. For. 15(1):5-7.
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