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Change canola cultivars regularly to reduce blackleg legacy

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Canola growers can reduce potential yield losses and the probability of blackleg disease resistance breakdown occurring by changing cultivars every three years... That's according to blackleg authority Steve Marcroft who says sowing the same cultivar every year is likely to break the cultivar's resistance to blackleg - the most severe disease of canola in Australia... Speaking at recent Grains Research and Development Corporation (GRDC) grains research Updates throughout the southern cropping region, Dr Marcroft has told growers and advisers that every year a cultivar is sown from the same resistance group, the number of virulent isolates that can attack that particular cultivar increases...
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