Pre-harvest is a good time to scout canola for diseases because symptoms will be advanced and easier to diagnose. The timing is too late to manage the disease for this year, but results will help answer these planning questions: Does the field need a longer break between canola crops? Should the field be managed more carefully to prevent the spread of soil-borne diseases? Does the farm need to look at cultivars with improved resistance to particular diseases?
This quiz describes symptoms for four diseases found in canola crops this time of year. Identify the disease based on the description.