Return to Canola Council Home
Economic spray thresholds are calculated based on individual species. We don’t have scientific evidence to combine thresholds, but where an “additive” effect of multiple species can make sense is when more than one species are feeding on key yield-producing areas — flowers, buds and pods — at the same time. For example, if you have lygus bug and cabbage seedpod…
Canola Watch Posts
-
-
Thresholds for lygus bugs and cabbage seedpod weevil, for example, are based on a specific sweep net technique. If you’re not doing a complete 180° pattern, walking while you sweep, and keeping the net near the top of the canopy, your counts could be significantly different from someone using the recommended techniques… -
The ideal time to swath for yield and quality is when 50-60% of seeds on the main stem are turning color. At this stage, most seeds on the side branches will have reached maturity and will ripen in the swath. This may not be a safe assumption when very low plant counts result in heavily branched canola plants… -
Growers considering a pre-harvest glyphosate cannot apply it to canola (RR or non-RR) until seed moisture drops to 30% or lower. This roughly coincides with 30% seed colour change. Spraying earlier raises the potential for glyphosate residue in seed…
-
Lygus bug numbers are high in some fields, but remember that as pods harden and get leathery, lygus will not be able to penetrate and cause damage… -
Growers are encouraged to examine strange disease patterns to see if clubroot has arrived on their farms… -
Growers seeing stem lesions or pre-mature ripening should take a closer to identify the cause. There is a good chance it’s sclerotinia. But it could be blackleg. It’s important to identify the cause because it will help in management for next year… -
Malathion CANNOT be used to treat bins where canola will be stored or to treat canola as it goes in to storage…
-
Canola growers in pockets across the Prairies are seeing a rise in bertha armyworm feeding. Check your fields, know the economic thresholds, and be mindful of bees when spraying…