A study at the University of Manitoba has confirmed the presence of soybean cyst nematode in the province.
Soil scientist Mario Tenuta, of the University of Manitoba, have confirmed it visually and through molecular DNA methods in four fields, out of a total of 106 fields tested, in a study running from 2012-2019.
At this point just four rural municipalities are affected, of the 18 RMs that were sampled. They are Norfolk-Treherne, Rhineland, Emerson-Franklin and Montcalm (see map below).
Given the large gap between regions with positive identification, there is a possibility that SCN may be present in fields that were not included in the survey, or may have established since sampling of a field has occurred, Manitoba Pulse & Soybean Growers said in a media release.
Cyst populations found in these four fields are “extremely low” and consistent with recent establishment of this pest. The arrival of SCN in Manitoba is not surprising, given the northward spread and distribution across North America. Once established, SCN can remain in the soil for many years.
The arrival of SCN in Manitoba fields can still be avoided by preventing the spread of soil from one field to another.
Populations of SCN can be minimized by rotating to non-host crops, growing SCN-resistant soybean varieties, growing cover crops, reducing tillage and controlling host weed species.