Killing johnson grass?
- Thread starter split toe
- Start date
Native Hunter
Well-Known Member
I'm doing an experiment with Outrider right now. You can look up the label on the Internet. I don't have JG myself but my neighbor does and he gave me permission to spray it in his fescue hayfield that borders one of my NWSG fields. It is supposed to kill JG and not harm his fescue. So far it looks to be working as advertised but only applied about a month ago. JG drying up slowly and all other grasses looking normal.
It can also be used in NWSGs for JG per the label. Potent stuff - once ounce per acre once a year in fescue pasture. Slightly higher dose for some other purposes listed on the label.
One thing to remember about JG is what SwampCat said - even if you get the roots at a place where it has been established, it will come back from seed for a few years. You have to keep repeating until the seed are exhausted.
In a clover plot you should be able to eventually kill JG with frequent mowing. It can't take mowing like fescue can.
If you don't mind killing everything you can keep spraying with gly and eventually get it. You are killing the roots but the seed already in the ground are making new plants.
It can also be used in NWSGs for JG per the label. Potent stuff - once ounce per acre once a year in fescue pasture. Slightly higher dose for some other purposes listed on the label.
One thing to remember about JG is what SwampCat said - even if you get the roots at a place where it has been established, it will come back from seed for a few years. You have to keep repeating until the seed are exhausted.
In a clover plot you should be able to eventually kill JG with frequent mowing. It can't take mowing like fescue can.
If you don't mind killing everything you can keep spraying with gly and eventually get it. You are killing the roots but the seed already in the ground are making new plants.
DrDirtNap
Active Member
One thing to keep in mind is that the optimum time to kill Johnsongrass is when it is near or at blooming time. Seed heads should be evident for maximum uptake to the rhizomes. In addition, applications made closer to fall tend to provide better rhizome control than applications made earlier. Multiple applications are often required.
I was suggested msma target 6+ and it seems to b working good. I sprayed it twice 10 days apart.
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LetThemGrow
Member
Would burning a small patch after gly kill help at all?
catscratch
Well-Known Member
"PASTORA (nicosulfuron + metsulfuron methyl) has just received its label in North Carolina to help with weed control in established bermudagrass pastures and hayfields. Pastora will help with postemergent control of a number of broadleaf weeds as well as barnyardgrass, broadleaf signalgrass, sandspur and johnsongrass and suppression of crabgrass. Applications of PASTORAÒ may result in temporary yellowing or stunting of bermudagrass. There are no grazing or haying restrictions."
https://duplin.ces.ncsu.edu/2010/06...-bermudagrass-pastures-hayfields-sprayfiield/
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I have used sulfosulfuron (aka Outrider, aka Certainty) to kill bracken fern in prairie grasses (big/little bluestem, switchgrass). Was working from an Australian label for same product available here.
Worked like a charm. Shows no result at all when applied but next spring the ferns are 100% gone.
Same "foreign label" research showed metsulfuron methyl would do same at lower price. Have some on hand for when ferns work their way back in, as they surely will.
Amazing what you can learn from Google searches. Not sure if the above will help you but that's a good starting point. Never dealt with Johnson grass myself (thank God!)
Good luck.
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Worked like a charm. Shows no result at all when applied but next spring the ferns are 100% gone.
Same "foreign label" research showed metsulfuron methyl would do same at lower price. Have some on hand for when ferns work their way back in, as they surely will.
Amazing what you can learn from Google searches. Not sure if the above will help you but that's a good starting point. Never dealt with Johnson grass myself (thank God!)
Good luck.
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Exactly what Australian label for sulfosulfuron said about killing bracken fern... which is also rhizomous. Apply in late summer (now), so chemical is translocated into the roots. That's where it works.
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The only way I have been able to kill it is dig it up. Then spray roundup on the seedlings that come up. Don't let it go to seed then dig and spray. LoL
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