Articles for June 2017


Tuesday, June 27th, is Canola Day at the North Central Research Center in Minot! The Northern Canola Growers Association, in conjunction with the North Central Research Extension Center in Minot will be hosting a canola research tour on June 27th, in Minot.

The tour begins at 9:00 a.m. and will conclude by noon.  A major focus will be on canola harvesting with emphasis on straight cutting, minimizing harvest loss, and residue management.  Several manufacturers will demo and discuss the latest in combine equipment and technology.  Other topics include canola seed singulation, crop rotation with canola and soybean, soil fertility, and pest management.  Again, the canola tour starts on Tuesday, June 27 at 9 am and ends with a complimentary noon lunch. 

Be sure to attend the Northern Canola Growers Association Summer Tour!


The first Sclerotinia risk map for the 2017 season will be available on June 18th, at three different websites, the NDSU Canola Pathology program, the Northern Canola Growers Association, and the Minnesota Canola Council. The Sclerotinia risk calculator will be available only at the NDSU canola pathology website.

The color coded Risk Map is designed to estimate risk of white mold development; low (green), moderate (yellow) and high (red). Maps will be refreshed on a daily basis beginning next week and can be observed by clicking on the “Risk Map” button. Clicking on any NDAWN station in the map will show the estimated percentage of risk of disease development for that station. This information will help growers make a more informed spraying decision.The Risk Calculator is an interactive tool that gives more precise risk for a specific field by allowing growers to enter important information about their field (such as crop rotation and disease history) into the forecasting model.

Questions and Answers

What conditions favor white mold?

1) Adequate rainfall before flowering that keeps the soil wet.

2) Cool to moderate temperatures during bloom.

3) Long wet periods (rain/heavy dew/fog) during flowering.

4) Dense canola canopies that create a wet microclimate.

How do the risk map and risk calculator help me?

Both tools help you understand your risk for white mold, which can help you decide whether or not to apply a fungicide. We always encourage growers to make the most informed decisions they can using as much information as possible; these tools can help you make those decisions.

When should I start using the risk map and risk calculator? 

The risk map and risk calculator are only applicable when your canola is in bloom. Canola petals are necessary for infection by Sclerotinia ascospores to occur. Thus, canola is only susceptible when it is blooming. From colonized petals, the fungus spreads to healthy green tissues and eventually, large yield-robbing lesions will develop on the stem and branches.

Q. How does the risk map work?

The Sclerotinia risk map is created from weather data collected from NDAWN weather stations to determine if conditions are favorable for ascospore dispersal and disease development. Green, yellow and red areas signify areas of low, medium and high risk.

How does the risk calculator work?

The Sclerotinia risk calculator uses the same data collected from NDAWN, but also takes into account additional data that grower can enter into the site. The additional data adds personalization and precision to Sclerotinia risk forecasts and is especially helpful when fields are in areas of intermediate risk.

What limitations do the risk map and risk calculator have?

1) Canola is only at risk during flowering and consequently the Risk Map and Calculator are only applicable during flowering.

2) The maps are only as good as the data received from NDAWN, and rainfall is notoriously variable. If you know that your fields have had more (or less) rain that the nearby station your risk may be higher (or lower).

Who developed the risk map and risk calculator?

The tools were developed by NDSU canola pathologist Luis del Rio with funding from the Northern Canola Growers Association.


Sam Markell

Extension Plant Pathologist, Broad-leaf Crops

Luis del Rio

Canola Pathologist


Crucifer and stripped flea beetles are peaking or just past peak in NC and NE canola growing areas as reported by T.J. Prochaska at NCREC and L. Lubenow at LREC. So, please re-scout any newly emerged canola fields to make sure the insecticide seed treatment is providing enough protection against flea beetle feeding injury, and any fields that have been emerged longer than 21 days since insecticide residue in the seed treatment will be reduced. The action threshold level for a foliar insecticide application is 25% defoliation for an economic return from the cost of that foliar insecticide. Remember to continue checking canola fields until it is larger than the 6-leaf growth stage or flea beetle populations have decreased, usually the end of June. During hot, dry weather, flea beetles populations can increase rapidly, and they are very active moving in and out of canola fields in large numbers. They can consume quickly any unprotected canola plants in a field!