Warm weather across Saskatchewan this week will have some farmers thinking about seeding, and as they make their plans for the year, weed control is definitely something to keep in mind.

John Ippolito, Regional Crops Specialist with the Ministry of Agriculture, says weed control has become more difficult in recent years with more herbicide resistant weeds showing up.

He says they've seen issues with group-2 resistant wild mustard and group-1 resistant wild oats, but a more recent problem they've seen is glyphosate-resistant kochia, and that's causing farmers to change their practices.

"In some cases even it's causing farmers to rethink the whole idea of chemfallow and maybe they should just crop those acres as opposed to trying to fallow them mainly because of the challenges with kochia control."

Ippolito says producers dealing with these weeds have a few options.

"As a minimum we make sure we're rotating herbicide groups so that we're not using the same mode of action or herbicide group for three or four years in a row. Even if you don't have herbicide resistant weeds just start using a tank mix of a couple different herbicide groups."

He also suggests farmers use a completely different herbicide group for the pre-seed burn-off, and then a tank mix in the post-emergent herbicide application.