Crop isolation, not extended rotation length, reduces blackleg (Leptosphaeria maculans) severity of canola (Brassica napus) in south-eastern Australia

By S. Marcroft, S. Sprague, S. Pymer, P. Salisbury, B. Howlett. 2004

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Major gene resistance in Brassica napus (oilseed rape) is overcome by changes in virulence of populations of Leptosphaeria maculans in France and Australia (2005, methodology): “Plants were cut transversely at the crown and then visually assessed for disease severity, which was scored as a percentage (0, 5, 10, 20, 30, 40, 50, 60, 70, 80, 90 or 100) of the cross section with internal necrosis (Marcroft et al., 2004).”
Improved Resistance Management for Durable Disease Control: A Case Study of Phoma Stem Canker of Oilseed Rape (Brassica napus) (2005, background): “Typically, ascospore dispersal gradients follow a negative exponential (or a power function, or a Cauchy) distribution with most spores deposited within 500 m of the source, especially the first 100 m, but with some risk to crops up to several kilometres away (West et al., 2001; Marcroft et al., 200”
Blackleg disease of canola mitigated by resistant cultivars and four-year crop rotations in western Canada (2013, background): “In the State of Western Australia, only one canola crop every 4 years is recommended because hot, dry summers preserve residues for longer periods, similar to conditions in western Canada.”