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Cylindrocladium root rot in ontario canada bare root nurseries estimate of spruce seedling losses



Cylindrocladium root rot in ontario canada bare root nurseries estimate of spruce seedling losses



Canadian Journal of Forest Research 18(11): 1493-1496



Estimates of cylindrocladium root rot losses in three black and three white spruce compartments at five Ontario bare-root nurseries were determined through visual field assessment and seedling isolation. The causal fungus, Cylindrocladium floridanum Sob. and C. P. Seym., was isolated from 10-77% of the symptomatic and 0-28% of the apparently healthy seedlings in each compartment. In five compartments, estimates of mean incidence based on seedling isolations and visual assessment, were higher than those based on visual assessment alone. The percentage of living spruce (apparently healthy or symptomatic) estimated to be infected in each compartment was 0.1-32.7%. No fungus isolations were attempted from dead seedlings. Mortality in the plots in the six compartments was 0.2-17.7%. The correlation between the level of Cylindrocladium incidence and the inoculum density was significant (p < 0.01) in two compartments. The use of inculum density to predict disease incidence warrants further investigation.

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Accession: 007173161

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