If you planted canola as part of your rotation, then you also may very well have Cabbage Seedpod Weevil (Ceutorhynchus obstrictus (Marsham))! If you have not checked your fields then now is the time to do so. Treatment thresholds for this tiny, yet destructive pest, are 2 to 3 adult weevils per sweep or 20 to 30 per (10x) sweeps.
I checked multiple fields in Okanogan and Northern Douglas County (5-7-20) and collected the following numbers: 18, 45, 41, 118, 257, 68 and 108 weevils. Using a heavy canvas sweep net, start sampling at the edge of fields and work inwards as you go. Don’t be surprised if you only find this pest concentrated on field borders, but during outbreak infestations, it may be found throughout the entire field. For more information about this pest, i.e., what it looks like and the biology and impact to canola production, and how to chemically treat it, check out the WSU Extension Fact Sheet Cabbage Seedpod Weevil Management in Canola (FS224E).
For questions or comments, contact Dale Whaley by email at dwhaley@wsu.edu or by phone at 509-745-8531.