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Heat, drought, off-label herbicide applications, male sterility, insects, sulphur deficiency, boron deficiency…
Insects
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Cabbage seedpod weevils are attracted to the buds on early canola plants, as shown in this Brooke Moon photo. While they will feed on these buds and destroy some of them, spraying is rarely recommended before 10% bloom… -
Pea leaf weevils (bottom) can be found in canola but the only weevil of concern is the cabbage seedpod weevil (top). Thank you Shelley Barkley of AAF for the excellent photos… -
Usually by the end of June, most of the cutworms that overwintered as eggs or partly grown larvae (including redbacked, as shown in this John Gavloski photo) have pupated and are no longer a risk to crops. In early and warm springs, cutworms will often pupate earlier in June. In cooler spring, cutworm activity often carries into July before pupation… -
Higher than normal cutworm feeding has been reported in some locations. This could be due to various factors, including the long fall, early spring and weed growth to provide food through these times. Here are scouting techniques to follow while inspecting canola fields for cutworms… -
Canola fields at greatest risk from flea beetles — therefore fields most likely to need a spray — tend to be those seeded early and that went through a long stretch of slow growth… -
Tracey Baute and Meghan Moran with the Ontario Ministry of Agriculture, Food and Rural Affairs and Dr. Rebecca Hallett at the University of Guelph, School of Environmental Sciences, have a new infosheet to help Ontario canola growers manage the insect… -
Cutworms and seedling diseases are fairly common causes for toppled or missing plants this time of year. Here are a few tips to help you distinguish which is at work… -
Flea beetles are just one thing to look for while scouting one to three weeks after seeding…
