Flea beetles have also been reported sporadically in volunteer canola and, to a much lesser extent, in seeded canola.
Cool-weather and slow-growing canola could mean the seed treatment runs out before the canola is big enough to withstand feeding.
Growers are advised to wait to spray until the action threshold is near to take action, even though there may be pockmarks on cotyledons.
And just a note that diamondback moth levels are moderate so producers should be scouting regularly.
Source : Pembinavalley online