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Effect of repeated cultivation during summer fallow on cylindrocladium floridanum in two ontario canada forest nurseries



Effect of repeated cultivation during summer fallow on cylindrocladium floridanum in two ontario canada forest nurseries



Canadian Plant Disease Survey 69(2): 129-134



The effect of repeated cultivation on microsclerotial densities of Cylindrocladium floridanum Sob. and C.P. Seym. in field soil was determined during three trials at two Ontario provincial nurseries. Repeated treatment during summer months of 1986 and 1987 did not significantly alter the germinable propagule levels in the field soil at Midhurst Nursery and Kemptville (= Howard J. Ferguson) Nursery. Although cylindrocladium root rot incidence and mortality of black spruce transplanted into one trial area were higher and the root collar diameters and seedling heights were lower in cultivated plots than untreated plots, the differences were not significant. Disease incidence and mortality of transplants in cultivated plots were, however, significantly higher than in spruce in fumigated plots (p > 0.05), while root collar diameters were significantly lower (p < 0.05). Repeated cultivation is not recommended as a means of reducing inoculum levels of C. floridanum in Ontario nursery soils. Its use may also negatively affect survival and growth of spruce transplants.

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Accession: 007258474

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