Insects Found – Still Monitoring

Bertha armyworm traps continue to be used for monitoring but so far numbers caught in Manitoba and Alberta indicate the risk is low. However, trap numbers in a few locations in Saskatchewan have surpassed the low threshold and fields in these areas may need to be watched more closely in the coming weeks. A risk map based on trap counts in Saskatchewan is available at the following link: The map will be updated regularly as trap results come in.

Cabbage root maggots were again reported in Saskatchewan and Alberta.  A number of fields in Alberta had considerable damage. Drier conditions earlier this spring are generally not favorable for root maggots so it is a bit surprising to see significant damage. There are only cultural management tools for this insect pest. More information on cabbage maggot is available at: An audio discussion on root maggots and other insect pests with Dr. Lloyd Dosdall, University of Alberta is available at ACPC’s website

Lygus populations are being monitored in the Peace Region of Alberta where populations have exceeded economic thresholds in the Rolla and Spirit River areas. There is a range for the economic threshold depending on crop stage and price.  More information is available at the following link:

Grasshopper activity increased with recent warm conditions and many areas report spraying of pastures and hayfields. Grasshoppers may become a concern in canola adjacent to a field cut for hay as the insects migrate to continue feeding. Continue scouting for grasshoppers because if caught early perimeter spraying may be all that is needed.  A specific economic threshold for grasshoppers in canola has not been established as it is not a preferred host crop, but it is currently considered to be in the range of 7 to 14 per m2, depending on the crop value and cost for control. More information on grasshoppers is available at the following link:$department/deptdocs.nsf/all/agdex6463