Sclerotinia stem rot could be a big problem in areas that started dry then turned wet and stayed fairly moist during and after flowering. The dry start to the season meant a lot of fields didn’t get sprayed with fungicide, even though conditions prior to and following flowering have favoured the disease in those areas…
Sclerotinia stem rot
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The decision-making process on whether to spray for sclerotinia stem rot in canola begins about three weeks before flowering. The situation leading up to that point is almost irrelevant, given the canola plant’s ability to crank up yield potential in response to improved growing conditions. Sclerotinia stem rot can go from no risk to high risk with a timely period…
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Canola Watch teams up with Real Agriculture to offer podcasts recorded live at canolaPALOOZA 2019 at Lacombe, Alberta. In this podcast, the first of five in the series, hosts Jay Whetter and Shaun Haney interview Luis Del Rio with North Dakota State University and Kelly Turkington with Agriculture and Agri-Food Canada to talk about sclerotinia stem rot risk factors and…
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The three points of the disease triangle are host, pathogen and environment. When it comes to sclerotinia stem rot in canola in Western Canada, the disease triangle hinges on one component: Environment…
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The sclerotinia stem rot infection cycle begins when sclerotia in the soil (left from the last time an infected crop was produced on that field) take up enough moisture to germinate and form little mushrooms known as apothecia. Spores are then released into the air from the mushrooms. Under ideal warm and moist conditions, it takes about two to three…
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If conditions are dry at early flower and then it rains at 40% to 50% flower, spraying at the end of the window may be effective – as long as there was enough moisture before flowering to get apothecia germinating. In this situation, later sprays could be especially effective if moisture also promoted a longer flowering window due to later…