Round Up: does it kill seeds

If I spray johnson grass that has headed out, will the round up kill the seeds, or will they germinate once they hit the ground?

Same question for 2,4d and blackberries.

Roundup will not kill the seeds, it is an enzyme inhibitor and there
would be ineffective against seeds. can't speak about 2-4D and
blackberries

2,4 d has some residual effects, so I would guess that it would inhibit the growth of the blackberries. This is just speculation, not fact.

Johnsongrass is a b itch to get rid of. The seeds will germinate up to 17 years after they are polinated, something like alfalfa or clover. You think you are clear, and poof- there it is again. Roundup will kill the grass and the rhizomes, so try to get it before it comes into head. As for the seedling, not much really affects it in corn, because it is related as a grass. BMP is to go over the top with roundup or a generic in RR ready corn or beans as soon as it starts to appear and when the corn is less than 2 feet tall. That will take care of most of your seedling johnsongrass. I often find some more later and spot treat it, but often try to time an over the top application of roundup to take care of broadleaf and newly emerged weeds in corn at around 1', and it usually takes care of the j-grass at that time.

The only thing I have ever seen that will eradicate Johnson Grass is goats they love the stuff first theing they eat when turned into a field.

Best thing to kill vines (and lots of other stuff) is GrazonNext. We've been using it for a couple of years now. About a 98% kill rate on berry vines with one spraying.

Also very effective on Carolina Horse Nettle, Bull Nettle, green briar, and other broad leaf weeds.

(quoted from post at 11:53:14 05/15/12) Best thing to kill vines (and lots of other stuff) is GrazonNext. We've been using it for a couple of years now. About a 98% kill rate on berry vines with one spraying.

Also very effective on Carolina Horse Nettle, Bull Nettle, green briar, and other broad leaf weeds.

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Kudzu?

Kudzu vine. Google it. Real ugly vine that literally chokes out everything in it's path. Last time we were down in the Smokies, it was everywhere.

A farmer from way up north came down south and visited some farmers. He was amazed at that johnson grass. Got back home telling friends about it. They decided to write farmer and ask where to get seeds and how to grow it. Down south farmer sent 3 johnson grass seeds and said to put them in a 100 acre field then get on his tractor and try like hell to kill it.

At what rate per acre and at what cost per acre using Grazonnext? Bull nettles are a real pest here in Ky,nearly unstoppable. Thanks, Joe

Best way I've found to control blackberries is to mow them and keep them mowed. Eventually the root system starves out. Goats work well where you can't get with a mower.

It depends on how mature the seeds have gotten before you kill the plant. All the roundup will do is kill the plant, roots and rhizome.

I would say the same applys for 2-4D

Gene

Roundup has to come in contact with the plant itself as 2-4D does also.
But 2-4D will be residual in the soil for a time so when a broadleaf sprouts and comes up the 2-4D in the soil will kill it. If roundup touches the soil it is neutralized.
Both also have drifting problems.

Perennials like nettle and especially bull nettle can be a tough kill because of the large root. I dug up a bull nettle just to see how large the root was. It was 37 inches long and 4 inches in diameter. Had to use the tractor to pull it out of the ground.

We use a spot spray for the bull nettle because we don't have that many in the fields. I mix 1 to 1.5 ounces per gallon in the hand sprayer and spray all leaves thoroughly. Even with that large root, we've had very good success. Probably a 75% or better kill rate. By next year we should have them pretty much eradicated from our fields and the edges of the fields.

For the tank in field spraying, mix rate is 1 qt per acre. Spray rate depends on your rig. Use a good surfactant. DO NOT USE SOAP. The tank doesn't spray them as thoroughly as spot spraying, but it still puts the hurt on them. Using a tank rig, may take a couple of apps during the year and a couple of years to eradicate them, but worth it! They are bad news.

Don't remember the cost on the GrazonNext. It has been worth every penny. Its been very effective. Lots of nettle, berry vines, goat weed, sour (curly) dock, and many other weeds, perennial and annual, are history on our place.

GrazonNext will also take out small trees about 2 ft tall. We have a problem with persimmon sprouts and its effective on them. I've even used it as a spot spray on persimmons that were 3 & 4 ft tall. Some took a second application, but it did take them out.

Spraying is by far the most cost effective weed control, can say that through personal experience.

Be sure to check with your seller. There is a concentrate coming out that the mix rate is lower, but of course price is higher. GrazonNext is a restricted use chemical in Tx and you have to have a license to buy it. Its not hard to get a license and it doesn't cost much either.