Any advice for spotted knapweed l

[Angus 1895]

Any body have any experience controlling it?

Thanks

 

[Barndog56]

I got rid of it with Triclopyr 4 from Keystone Pest Solutions. I mowed it off and then sprayed 2 weeks later when it was regrowing. Triclopyr will kill all of the other broadleaves it touches too though.

 

[Angus 1895]

We have a nice amount of alfalfa in the pasture the knapweed is. Clover too.

 

[Angus 1895]

I’m going to mow, then spot spray with 2 4 D , I don’t want a residual like milestones because I want more legume. I’m thinking. Also considering introducing the root weevil if I can get my wife’s approval to buy them.

 

[homerj]

Stinger kills knapweed dead, but definitely leaves a residual.

 

[SD51555]

That’s a low calcium, high manganese weed. I might guess you have a clay soil and lower pH.

I don’t know if anything is gonna take that out without taking your clover and alfalfa with it. Check your soil test for pH and calcium levels. Calcitic Lime and gypsum probably won’t knock it out 100%, but could weaken it enough to where it’s not dominant any longer. Change the conditions and you change the output.

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[Brian662]

That’s a low calcium, high manganese weed. I might guess you have a clay soil and lower pH.

I don’t know if anything is gonna take that out without taking your clover and alfalfa with it. Check your soil test for pH and calcium levels. Calcitic Lime and gypsum probably won’t knock it out 100%, but could weaken it enough to where it’s not dominant any longer. Change the conditions and you change the output.

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I'm afraid knapweed is a prolific seeder and prevalent in many soil types. A co-worker has been dealing with it for many years on very sandy soil in Central WI. Nasty stuff.

 

[Angus 1895]

The soil is a pH of 7.3.

The knapweed is prevelant where irrigation is challenged.

It also doesn’t like being mowed.

 

[Angus 1895]

How ever mowing doesn’t eliminate it.

Here is the problem area next to a mowed area. Under close observation the knapweed is still there. Just shorter