Abstract
Four species were grown as cover crops and incorporated into soil of field plots at Midhurst Nursery, Midhurst, Ontario, two times per growing season for 2 successive years. After two seasons, microsclerotial populations of Cylindrocladium sp. were higher in soils planted with alfalfa (Medicagosativa L., cv. Vernal) (p = 0.03) and Sudan grass (Sorghumbicolor (L.) Moench, cv. Green Leaf) (p = 0.10), and not different in soils with spring wheat (Triticumaestivum L., cv. Glen Lea), than populations in noncropped, fallow plots. Lower populations of the fungus were detected in soils planted with flax (Linumusitatissimum L.) (p < 0.08) than in the fallow ones. Highest disease incidence in black spruce (Piceamariana (Mill.) B.S.P.) transplants occurred when grown in plots treated with alfalfa, Sudan grass, and wheat. Disease incidence was lower in transplants grown in the flax plots than in those grown in the other plots (p < 0.001), including the fallow ones (p = 0.055). Spruce mortality was also less in the flax plots compared with all other treatment plots (p < 0.001).
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