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Effects of crop rotation on common root rot of barley



Effects of crop rotation on common root rot of barley



Canadian Journal of Plant Pathology 10(1): 61-65



The effects of rotations involving grass, fallow, barley, oats, and canola on the incidence of root rot of the following barley crop was recorded for a 4-year period. The lowest incidence of root rot occurred in barley after grass (16% of plants infected). Root rot incidence was intermediate after oats (36%), higher after canola (64%) and fallow (73%), and most severe following two or more crops of barley (80%). The numbers of conidia of Cochliobolus sativus varied greatly in soils from the various rotations, the highest number being in barley stubble and the lowest in bromegrass sod. The numbers of conidia of C. sativus in the soil also increased with an increase in the number of successive crops of barley. The incidence of subcrown internode lesions of barley at 2- or 3-week intervals after planting was recorded from the various rotations; the rate of lesion development increased most rapidly between 7 and 9 weeks after emergence. The ratio of C. sativus to Fusarium culmorum isolated from barley subcrown internodes generally decreased with time after emergence for all rotations, except continuous barley where the ratio increased.

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Accession: 001580239

Download citation: RISBibTeXText

DOI: 10.1080/07060668809501766



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