Home Crop Monitoring Canola School: Managing weeds early in the season

Canola School: Managing weeds early in the season


Beginning the 12 months off on the proper foot requires just a little little bit of forethought and planning. On the subject of preserving a canola crop clear throughout the early phases of development, there are some steps to take earlier than even seeding the crop.

Dr. Charles Geddes, analysis scientist in weed ecology and cropping programs at Agriculture and Agri-Meals Canada in Lethbridge, Alta. joins Kara Oosterhuis for this Canola College episode on early season weed administration.

“When we’re talking about early season weed control, one of the first things to consider is scouting,” says Geddes. “Scouting is important at multiple different times of the year — it’s not something we’re just considering early in the season — the idea is that for scouting, first of all you want to consider it on a field-by-field basis.”

Even earlier than going out to the subject, assume again to what the circumstances had been final 12 months, particularly the weeds that went to seed — if there have been any weedy escapes that entered the seed financial institution, they’ll come again to hang-out you this 12 months. Escaped weeds which have gone to seed are particularly necessary to think about in minimal or zero-till conditions as a result of the seed lands on the soil floor and is able to germinate the following spring.

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Moisture circumstances are additionally necessary, says Geddes. “One of the big potential issues will be with dry conditions and the potential for herbicide carryover,” says Geddes. “So that gets into crop safety, so this year especially it’ll be really important to think back to what you were growing on that field the previous year, what herbicides were applied the previous year.”

Below dry circumstances, sure herbicides can carry over for as much as two years, so it’s necessary to examine the herbicide’s data, which is offered in the provincial crop safety information, or on the herbicide’s label.

“Herbicide breakdown is usually related to moisture levels and also temperature as well,” explains Geddes. “So you almost need the combination of having enough moisture, and it has to be warm enough for microbial activity to break down those herbicides over time.”

Snowfall can contribute to herbicide breakdown however at the time of snowmelt, soils are nonetheless chilly, so microbial exercise gained’t happen at that temperature to interrupt down any remaining herbicide residue.

The essential weed-free interval, when canola is rising and placing on vegetative development earlier than having an opportunity to shut the cover, is essential to guard the crop from competitors and to guard yield. Geddes says that it’s necessary to consider the weed spectrum that’s current in the subject — which comes again to scouting — and that can assist decide which herbicides will greatest handle weeds in that subject.

It’s additionally necessary to consider the residual exercise of a herbicide you’ll use says Geddes. Utilizing a herbicide that has residual exercise, will assist take choice strain off the post-emergent herbicide, however it’s additionally necessary to match the herbicide with the weeds current in the subject, and any resistant weeds inside that subject.

“When we’re talking about mixing herbicide modes of action, or rotating herbicides, or layering herbicides, it’s one thing to layer herbicides or the modes of action, but it’s another thing to make sure those modes of action have efficacy on the weeds in that field,” provides Geddes.


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