Sclerotinia Risk Forecast Program for North Dakota
Click on the following link to access the NDSU Interactive Sclerotinia Website:
http://www.ag.ndsu.edu/sclerotinia/
The Sclerotinia Risk in Canola Forecast Program is a service of the Northern Canola Growers Association and NDSU. The Sclerotinia Disease Forecasting System is a regional guide to sclerotinia of canola disease risk. It is meant to be a management tool that canola producers can use in making a decision on the necessity of applying a fungicide to their canola crop for control of sclerotinia stem rot. It is not meant to be a field-specific recommendation for the application of fungicides for the control of sclerotinia. Other factors such as local weather conditions, seeding date, previous cropping history, and yield potential should be considered as well as the risk maps in making the final decision. The forecast maps show regions of North Dakota and Minnesota where environmental conditions are favorable for the germination of sclerotinia sclerotia, development of apothecia and release of spores. The degree of risk is shown as low, moderate and high coded green, yellow and red.
By its use, you agree to release the Northern Canola Growers Association and its employees and project collaborators from any and all claims, demands, actions or liability for material used or relied upon by you through this service. All results, statements, technical information or recommendations herein are believed to be reliable, but their accuracy or completeness is not guaranteed.
The project collaborator and developer is Dr. Luis del Rio, Plant Pathologist, North Dakota State University.
Sponsors are the Northern Canola Growers Association and the National Sclerotinia Initiative. Weather data and technical assistance: North Dakota Agricultural Weather Network NDAWN.
| Sclerotinia Forecast |
7/31/2011
Sclerotinia stem rot
The last map of the 2011 growing season has been uploaded. By this time, most fields have already finished the flowering period and thus are out of danger. The disease-conducive weather prevalent in some areas for this period may result in light Sclerotinia infection on canola that has been heavily lodged. Canola plants that are standing straight should not have problems.
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| Sclerotinia Forecast |
7/28/2011
Sclerotinia stem rot
Risk of Sclerotinia stem rot
Risk of Sclerotinia development for most canola growing regions for July 28, 2011 has increased in many parts of the canola growing areas of the region. This is in response to cooler temperatures and the precipitation experienced in previous days. While favorable conditions are still of concern, growers should keep in mind that fields that are past full bloom or have ended flowering altogether, are no longer at risk of high infection. Fungicide applications in those fields are not recommended because they usually do not provide an economic return.
Lodging and Sclerotinia stem rot
While fields that have finished the flowering stage are out of danger of major infection, very light yield losses could be experienced in areas of the fields where the plants are heavily lodged. Lodged plants help maintain humidity in soil and air under the canopy for long times and thus favor apothecia formation as well as infection of plants. Under this condition, the fungus can move from plant to plant; however, the movement will be mostly limited to the lodged plants and only very light yield reductions could occur. Fungicide applications to control Sclerotinia on lodged plants that have passed the flowering stage are not recommended.
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| Sclerotinia Forecast |
7/25/2011
Attention: Technical difficulties at NDSU preclude production of a map for July 25. Tables will be provided until further notice.
Risk of Sclerotinia development for most canola growing regions for July 25, 2011 is low. While precipitation continues to fall in some canola growing regions, at this point fields planted by June 1st are already in the late flowering stages or have entered the ripening stage. Therefore, the risk of new infections by Sclerotinia is low and fungicide applications are not recommended.
Fields planted by June 7th in Bottineau, Cavalier, Mountrail, and Rolette counties in North Dakota, and Kittson and Pennington counties in Minnesota are in the early stages of flowering. Risk of Sclerotinia for Bottineau and Rolette counties is low at this time. Cavalier County has intermediate risk, but Mountrail, Kittson, and Pennington counties are at high risk at this point. Growers in these counties are urged to check the risk calculator to help in their decision regarding fungicide applications.
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| Sclerotinia Forecast |
7/20/2011
Sclerotinia stem rot
Risk of Sclerotinia development for most canola growing regions for July 20, 2011 is low. The high precipitations recorded in the initial days of the heat wave caused the risk to remain high for certain areas; however, the absence of significant precipitation in the past three days has negated the impact of the precipitation and brought down the risk in most areas. The warm temperatures experienced in the past few days have also helped speed up the flowering process. The estimated flowering stage of fields planted at three different dates has been calculated using: http://ndawn.ndsu.nodak.edu/ data.
Canola growth stages and risk of Sclerotinia
Fields planted by May 24th have for the most part finished the flowering stage and are entering now the early ripening stages. The window for infection by Sclerotinia has ended for these fields.
Fields planted by June 1st are passing the 50% bloom stage in most locations. For most of these fields the risk of Sclerotinia infection is closing and fungicide applications made from this point on will not produce economic returns.
Fields planted by June 7th are in the early stages of flowering and thus at the most susceptible stage for infection by Sclerotinia. Growers with fields at this stage are encouraged to check the estimated risk of Sclerotinia development and the risk calculator when deciding whether to spray or not.
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