Saskatchewan canola producers in the eastern and northern areas are seeing the biggest problem. An outbreak of Bertha armyworms is causing problems for some Saskatchewan canola producers the biggest problem is in the eastern and northern parts of the province. While infestation levels vary widely from one field to the next, insecticide application is warranted. Economic thresholds have been established based on the cost of insecticide and application and the expected value of canola. The threshold ranges from 10 to 34 larvae per square metre, depending on crop value and cost of control. If control measures are required, registered insecticides can be applied by air or ground. Best times for application are evening and early morning, since larvae are usually actively feeding during these times.