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Sclerotinia Risk Forecast Program for North Dakota and Minnesota
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. Maps are also produced showing top zone soil moisture and canola growth stage based on average seeding dates for canola crops in the vicinity of North Dakota Agricultural Weather Network (NDAWN) weather stations.
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 collaborators are Dr. Gary Platford, Plant Pathologist, Jennifer Lamb GIS Specialist P&D Agro Consulting Inc., Dr. Art Lamey, Plant Pathologist and 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: Environment Canada Meteorology Service Commercial Weather Services Division and North Dakota Agricultural Weather Network NDAWN.
Recent News
| Sclerotinia of Canola Risk Forecast for North Dakota and Minnesota |
7/26/2007
July 26, 2007
This is the last sclerotinia of canola risk forecast for 2007.
An analysis of weather data and the top zone (0 to 4 inch) soil moisture for the canola producing areas of North Dakota and Minnesota for the 10 day period ending July 25th 2007 indicates that the risk of sclerotinia is low throughout North Dakota and the portion of Minnesota included in the forecast as indicated in the risk map. The majority of canola in North Dakota and Minnesota is in the late ripening to ripe growth stages as indicated in the GDD map and most canola crops will be past the recommended stage for a fungicide application. Canola crops within all areas may be in a more or less advanced stage because of an earlier or later seeding date then the average seeding dates used to prepare the GDD map. Canola growth stages can be calculated for specific seeding dates and weather stations at the NDAWN site http://ndawn.ndsu.nodak.edu/canolagdd-form.html .
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| Sclerotinia of Canola Risk Forecast for North Dakota and Minnesota |
7/23/2007
Sclerotinia of Canola Risk Forecast for North Dakota and Minnesota
July 23, 2007
An analysis of weather data and the top zone (0 to 4 inch) soil moisture for the canola producing areas of North Dakota and Minnesota for the 10 day period ending July 22nd 2007 indicates that the risk of sclerotinia is low throughout North Dakota and the portion of Minnesota included in the forecast as indicated in the risk map. Hot and dry weather has created conditions unfavorable for release of ascospores and infection of canola plants. Also the majority of canola in North Dakota and Minnesota is in the early ripening to ripe growth stages as indicated in the GDD map and most canola crops will be past the recommended stage for a fungicide application. Only canola crops planted after May 21 might still be in the blossom stages where a fungicide application is recommended. Canola crops within all areas may be in a more or less advanced stage because of an earlier or later seeding date then the average seeding dates used to prepare the GDD map. Canola growth stages can be calculated for specific seeding dates and weather stations at the NDAWN site http://ndawn.ndsu.nodak.edu/canolagdd-form.html .
When making decisions on spraying canola fields it is very important to determine the growth stage and specifically the blossom stage. Fungicide applications are most effective when applied between the 10% to 50% blossom stages depending on product used. Images of canola blossom stages can be viewed at http://www.ext.nodak.edu/extpubs/plantsci/crops/a1208w.htm .
Quadris (Azoxystrobin), Endura (Boscalid), Ronilan (Vinclozolin), Topsin M, and T-Methyl, (Thiophanate methyl) and Proline (Prothiconazole) are registered for control of Sclerotinia in Canola. For more information see the North Dakota 2007 Field Crop Fungicide Guide online at the following site: http://www.ag.ndsu.edu/pubs/plantsci/pests/pp622/pp622.pdf .
The top zone soil moisture map indicates that the top 4 inches of soil over most of North Dakota, and the portion of Minnesota included in the forecast ranges from 0% to 70% of field capacity. There are a few localized areas in Southwest and Northern North Dakota where top zone soil moisture is above 90% but most canola crops in these areas are in the late ripening to ripe growth stages.
The last forecast for 2007 will be posted Thursday July 26th, 2007.
The sclerotinia forecast maps and interpretations can be accessed at www.northerncanola.com/maps/index.asp or
Go to the North Dakota Sclerotinia Risk in Canola Forecast Home Page
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| Sclerotinia of Canola Risk Forecast for North Dakota and Minnesota |
7/19/2007
Sclerotinia of Canola Risk Forecast for North Dakota and Minnesota
July 19, 2007
An analysis of weather data and the top zone (0 to 4 inch) soil moisture for the canola producing areas of North Dakota and Minnesota for the 10 day period ending July 18th 2007 indicates that risk of sclerotinia has decreased in most areas of North Dakota and Minnesota as indicated in the risk map. There are localized areas of high risk in Renville and Bottineau Counties in North Dakota and Clay County in Minnesota. The risk remains moderate in portions of North, Central and Southwest North Dakota and Northwest Minnesota. The five day NOAA's National Weather Service Weather Forecast
predicts hot weather with day time high temperatures ranging from 80 degrees F to the mid
90’s and a low probability of rainfall in most areas of North Dakota and Minnesota. These weather conditions will lower the risk of sclerotinia. Also the majority of canola in North Dakota and Minnesota is in the early to late ripening growth stages as indicated in the GDD map and individual canola crops may be past the recommended stage for a fungicide application. Only canola planted after May 15 is likely to be in the blossom stages where a fungicide application is recommended. Canola crops within all areas may be in a more or less advanced stage because of an earlier or later seeding date then the average seeding dates used to prepare the GDD map. Canola growth stages can be calculated for specific seeding dates and weather stations at the NDAWN site http://ndawn.ndsu.nodak.edu/canolagdd-form.html .
When making decisions on spraying canola fields it is very important to determine the growth stage and specifically the blossom stage. Fungicide applications are most effective when applied between the 10% to 50% blossom stages depending on product used. Images of canola blossom stages can be viewed at http://www.ext.nodak.edu/extpubs/plantsci/crops/a1208w.htm .
Quadris (Azoxystrobin), Endura (Boscalid), Ronilan (Vinclozolin), Topsin M, and T-Methyl, (Thiophanate methyl) and Proline (Prothiconazole) are registered for control of Sclerotinia in Canola. For more information see the North Dakota 2007 Field Crop Fungicide Guide online at the following site: http://www.ag.ndsu.edu/pubs/plantsci/pests/pp622/pp622.pdf .
The top zone soil moisture map indicates that the top 4 inches of soil over most of North Dakota, and the portion of Minnesota included in the forecast ranges from 0% to 70% of field capacity. However there are areas of North, Central and Southwest North Dakota and Northwest Minnesota where the top zone soil moisture ranges from 70% to over 100% of field capacity. Local weather, soil and crop conditions may result in a more favorable condition for germination of the sclerotinia sclerotia and infection of canola plants than is indicated in this report.
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| Sclerotinia of Canola Risk Forecast for North Dakota and Minnesota |
7/15/2007
Sclerotinia of Canola Risk Forecast for North Dakota and Minnesota
July 16, 2007
An analysis of weather data and the top zone (0 to 4 inch) soil moisture for the canola producing areas of North Dakota and Minnesota for the 10 day period ending July 15th 2007 indicates that risk of sclerotinia has decreased in large areas of North Dakota and Minnesota as indicated in the risk map but remains moderate to high in portions of North, Central and Southwest North Dakota and Northwest Minnesota. However the majority of canola in North Dakota and Minnesota is in the early ripening growth stage as indicated in the GDD map and individual canola crops may be past the recommended stage for a fungicide application. Only canola planted after May 15 is likely to be in the blossom stages where a fungicide application is recommended. Canola crops within all areas may be in a more or less advanced stage because of an earlier or later seeding date then the average seeding dates used to prepare the GDD map. Canola growth stages can be calculated for specific seeding dates and weather stations at the NDAWN site http://ndawn.ndsu.nodak.edu/canolagdd-form.html .
When making decisions on spraying canola fields it is very important to determine the growth stage and specifically the blossom stage. Fungicide applications are most effective when applied between the 10% to 50% blossom stages depending on product used. Images of canola blossom stages can be viewed at http://www.ext.nodak.edu/extpubs/plantsci/crops/a1208w.htm .
Quadris (Azoxystrobin), Endura (Boscalid), Ronilan (Vinclozolin), Topsin M and T-Methyl, (Thiophanate methyl) and Proline (Prothiconazole) are registered for control of Sclerotinia in Canola. For more information see the North Dakota 2007 Field Crop Fungicide Guide online at the following site: http://www.ag.ndsu.edu/pubs/plantsci/pests/pp622/pp622.pdf .
The top zone soil moisture map indicates that the top 4 inches of soil over most of North Dakota, and the portion of Minnesota included in the forecast ranges from 0% to 70% of field capacity. However there are areas of North, Central and Southwest North Dakota and Northwest Minnesota where the top zone soil moisture is above 100%. Local weather, soil and crop conditions may result in a more favorable condition for germination of the sclerotinia sclerotia and infection of canola plants than is indicated in this report.
In assessing the risk for individual fields in addition to the weather conditions the following points should be considered:
1.Crop rotation. Other crops susceptible to sclerotinia include sunflower, and pulse crops such as field bean, field pea, and lentil. Although crop rotation is important, environmental conditions are the main determining factor in the development of sclerotinia in canola.
2. Has sclerotinia been a problem in the immediate area on canola or other crops in recent years? Sclerotinia sclerotia can remain viable in the soil for up to four years.
3. Is there a high yield outlook for the field based on fertilizer application and heavy crop stand? The higher the target yield, the greater the chance of sclerotinia occurrence.
In order to further assess the disease risk, refer to the Sclerotinia stem rot checklist which can be viewed at: http://www.whitemoldresearch.com/HTML/canola.cfm
The next sclerotinia risk forecast, is scheduled for release Thursday, July 19th 2007.
The sclerotinia forecast maps and interpretations can be accessed at www.northerncanola.com/maps/index.asp or
Go to the North Dakota Sclerotinia Risk in Canola Forecast Home Page
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