The correct choice of a herbicide is dependent on at least three things: The current crop, the next crop (and timeline), and the weeds you are targeting. If you know all these things, fill in the boxes below and a list of herbicides registered in Montana for the conditions you specify will be generated. Each herbicide name is linked to the label for that product as presented by Crop Data Management Systems.

Before proceeding, be sure and go to the label and read specific instructions on the use of that chemical. Our intent is not to rank or recommend any particular herbicide, but to reduce the number of choices by filtering out those chemicals that do not fit your crop, crop rotation, or weed spectrum.

If you're not sure which weeds you have, use the following links to help identify them.

• Broadleaf and Grass Weed Seedling ID Key a black and white line drawing and dichotomous key from the University of Minnesota.
• Weed ID Resources photos of seedlings from Iowa State Weed Science.
• Crop & Garden Weeds photos from University of Missouri.
• Weed View photos from University of Nebraska (best viewed using Microsoft IE)

Start by filling in the following boxes

Current Crop:

barley durum wheat oats rye spring wheat triticale winter wheat clearfield spring wheat clearfield winter wheat

Adjust the number of months until the next crop is planted. Keep in mind that the time is the number of months from herbicide application till a new crop is planted.

Rotating to:	barley canola chickpeas corn lentils peas safflower sugarbeet sunflower wheat clearfield canola clearfield corn clearfield sunflower clearfield wheat   in	months
Broadleaf weeds to target		Level
primary	nonealfalfa aster black mustard black nightshade blue mustard brackenfern buffalobur bursage butercup bur Canada thistle chickweed chicory clovers (annual) coast fiddleneck cocklebur common bedstraw conical catchfly corn gromwell cowcockle curly dock cutleaf nightshade dandelion death camas Eastern Black nightshade false chamomile falseflax field bindweed field pennycress fleabane flixweed goldenrod green smartweed groundsel hairy nightshade hemp dogbane henbit hoarycress jimsonweed knawel kochia kochia, ALS resistant kochia, Dicamba resistant ladysthumb smartweed lambsquarters leafy spurge lentils (volunteer) mallow marshelder mayweed chamomile meadow salsify milkweed morningglory (annual) mouse-ear chickweed oxeye daisy peas (volunteer) Pennsylvania smartweed perforated pepperweed pineappleweed plantain prickly lettuce prickly lettuce, 2,4-D resistant prostrate knotweed puncturevine purslane ragweed (common) redroot pigweed redstem filaree Russian knapweed Russian thistle Russian thistle, ALS resistant scouring rush shepherdspurse silverleaf nightshade sowthistle (annual) sowthistle (perennial) speedwell spiny sowthistle starthistle, yellow sunflower tansymustard tummble mustard velvetleaf venice mallow vervains vetch (annual) water hemlock waterpod white cockle wild buckwheat wild carrot wild garlic wild mustard wild onion yarrow yellow toadflax	controlledsuppressed
secondary	nonealfalfa aster black mustard black nightshade blue mustard brackenfern buffalobur bursage butercup bur Canada thistle chickweed chicory clovers (annual) coast fiddleneck cocklebur common bedstraw conical catchfly corn gromwell cowcockle curly dock cutleaf nightshade dandelion death camas Eastern Black nightshade false chamomile falseflax field bindweed field pennycress fleabane flixweed goldenrod green smartweed groundsel hairy nightshade hemp dogbane henbit hoarycress jimsonweed knawel kochia kochia, ALS resistant kochia, Dicamba resistant ladysthumb smartweed lambsquarters leafy spurge lentils (volunteer) mallow marshelder mayweed chamomile meadow salsify milkweed morningglory (annual) mouse-ear chickweed oxeye daisy peas (volunteer) Pennsylvania smartweed perforated pepperweed pineappleweed plantain prickly lettuce prickly lettuce, 2,4-D resistant prostrate knotweed puncturevine purslane ragweed (common) redroot pigweed redstem filaree Russian knapweed Russian thistle Russian thistle, ALS resistant scouring rush shepherdspurse silverleaf nightshade sowthistle (annual) sowthistle (perennial) speedwell spiny sowthistle starthistle, yellow sunflower tansymustard tummble mustard velvetleaf venice mallow vervains vetch (annual) water hemlock waterpod white cockle wild buckwheat wild carrot wild garlic wild mustard wild onion yarrow yellow toadflax	controlledsuppressed
secondary	nonealfalfa aster black mustard black nightshade blue mustard brackenfern buffalobur bursage butercup bur Canada thistle chickweed chicory clovers (annual) coast fiddleneck cocklebur common bedstraw conical catchfly corn gromwell cowcockle curly dock cutleaf nightshade dandelion death camas Eastern Black nightshade false chamomile falseflax field bindweed field pennycress fleabane flixweed goldenrod green smartweed groundsel hairy nightshade hemp dogbane henbit hoarycress jimsonweed knawel kochia kochia, ALS resistant kochia, Dicamba resistant ladysthumb smartweed lambsquarters leafy spurge lentils (volunteer) mallow marshelder mayweed chamomile meadow salsify milkweed morningglory (annual) mouse-ear chickweed oxeye daisy peas (volunteer) Pennsylvania smartweed perforated pepperweed pineappleweed plantain prickly lettuce prickly lettuce, 2,4-D resistant prostrate knotweed puncturevine purslane ragweed (common) redroot pigweed redstem filaree Russian knapweed Russian thistle Russian thistle, ALS resistant scouring rush shepherdspurse silverleaf nightshade sowthistle (annual) sowthistle (perennial) speedwell spiny sowthistle starthistle, yellow sunflower tansymustard tummble mustard velvetleaf venice mallow vervains vetch (annual) water hemlock waterpod white cockle wild buckwheat wild carrot wild garlic wild mustard wild onion yarrow yellow toadflax	controlledsuppressed
Grass weeds to target
primary	noneannual bluegrass annual ryegrass barnyardgrass bulbous bluegrass cereal (volunteer) cheat corn (volunteer) crabgrass downy brome foxtail (green) foxtail (yellow) foxtail barley goosegrass japanese brome johnsongrass jointed goatgrass littleseed canarygrass Persian darnel quackgrass red sorrel rye (cereal) signalgrass wild oat, ACC resistant wild oats wild proso millet witchgrass	controlledsuppressed
secondary	noneannual bluegrass annual ryegrass barnyardgrass bulbous bluegrass cereal (volunteer) cheat corn (volunteer) crabgrass downy brome foxtail (green) foxtail (yellow) foxtail barley goosegrass japanese brome johnsongrass jointed goatgrass littleseed canarygrass Persian darnel quackgrass red sorrel rye (cereal) signalgrass wild oat, ACC resistant wild oats wild proso millet witchgrass	controlledsuppressed
secondary	noneannual bluegrass annual ryegrass barnyardgrass bulbous bluegrass cereal (volunteer) cheat corn (volunteer) crabgrass downy brome foxtail (green) foxtail (yellow) foxtail barley goosegrass japanese brome johnsongrass jointed goatgrass littleseed canarygrass Persian darnel quackgrass red sorrel rye (cereal) signalgrass wild oat, ACC resistant wild oats wild proso millet witchgrass	controlledsuppressed

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Return to regular view	Text-only	Updated: July 30 2009