Herbicide strategy for in-crop herbicide purposes in canola first requires figuring out what weeds are on the market, and preserving in thoughts that two purposes is an possibility.
On this Canola College episode, Jaeda Hoppe, area crop agronomist with UYMI Agronomy at Biggar, Sask., says that two in-crop herbicide purposes is probably going if the weeds are there and spring circumstances have been dry.
Hoppe says that in relation to tank-mixing, first figuring out which group the canola is immune to — Group 2, Group 9, or Group 10 — and factoring within the grassy weed inhabitants can create an excellent management strategy.
“If you have a lot of grassy weeds, and you’re solely relying on a contact chemical to actually get the control, I don’t like that, I’m not comfortable with that,” says Hoppe. “If you have a very low grassy population, you’d probably get away with just the contact chemical, but I like to see someone use a Group 1 and just make sure.”
Utilizing correct herbicide rotation with totally different lively elements means doing due diligence in relation to herbicide resistance, provides Hoppe. (Story continues under video)
The timeframe to manage weeds? Usually from cotyledon to bolting, which is a large window, however Hoppe warns that selecting a two-pass techniques means the management window is extra slim. Earlier than row closure is good, however that additionally means the weeds can’t be too massive — particularly weeds that emerged concurrently the canola crop, akin to cleavers or sow thistle.
When the canola crop itself could be very “stagey” weed management in these crops goes to be more durable, and that’s when two purposes shall be actually useful — to manage weeds that got here up with the crop and weeds that got here up later.
“Ideally, the best control you’re going to get is with as small a weed as possible, but also with that being said, when you’re waiting for rain, you’re waiting for weeds to come out of the ground, so it makes staging for weeds really awkward, ” says Hoppe.