Tough Weeds this Year

I'm new to spraying - bought one in 2010 and last year was the first year using it - its an old 3wheel spra-coupe w 60' booms...

Anyway - last year used glyphos...exclusively and killed everything - but had to spray 4 times - preplant, and then every month thereafter.

But this year the glyphos is not killing some broadleaves - I think horsetail and maybe waterhemp...

I have soybeans and a friend told me to add soybean oil (not crop oil) and AMS to the tank when I spray next (8oz per ac of soybeanoil)...He says that has really made his tough weeds easy to kill.

But I was wondering what do some of you use in your tanks for beans...do any of them have any pre-emerge (residue) qualities to reduce the spray trips?

My preplant spraying was 1.5q/ac of buccaneer plus and then I came back to spot spray the stubborn weeds w 2Q/ac...they are still here and still green (2 weeks)...

Oh - yea - and I've got dead weeds amoungst the tough weeds...grasses and other broadleaves of dead with these other ones amounst them seemingly fine. So I'm not missing em.

Tom, if the horsetail your talking about is what we call mares tail in the south, it's glyphosate resistant. This is not uncommon, spiny pigweed has become that way in the South. Your choice of using ams and mso (seed oil) is an excellent one. Talk with your county agent, you may find you'll have to tank mix in another product for complete control. it's not uncommon for us to have 3-4 products in the mix for some apps.

I never spray glyphosate without a Nitrogen product of some kind.

I have used Class Act, Ammonium Sulfate (AMS) and plain 28% liquid nitrogen.

Nitrogen helps the glyphosate penetrate the leaves.

Are you getting a good spray pattern out of your sprayer? What are your spray tips like?

I spray early(2 weeks before planting) with 24-D and Sonic. Sonic is a residual chemical. Then when beans are about a foot tall or so I come in with the Glyphosate and a Nitrogen product.

The 24D helps with Glyphosate resistant weeds.

Use Extreme, it is roundup with pursuit, I am going to try a generic version of it this year called Thundermaster. Always use AMS and if the weeds are over 3-4 inches use oil and make it stick to them. That will be my first pass about 28 days after planting and then a second pass of roundup 28 days or so later, will try to time that pass with a cheap insecticide for aphids and fungicide also. Worked really good last year. If you have this much weed pressure, are you no till or what, sounds like it. Need to burn everything down before planting, don't ever plant into green weeds. A good tillage will get you that 3-4 weeks without spraying in most situations.

If he is talking about what is called mares tail. It is a fall perennial so you get best kill if you spray for that in the fall. We are going to try spraying after soybean cutting this fall for it. My brothers one place is covered with it on a sand hill.

That Mare's tail is a tough weed to kill. It used to be fairly rare but it has thrived with no-till. Just a little tillage will kill it but it is resistant to most chemicals. Round up used to control it but guys using low rates quickly made the plant resistant to Roundup.

As for your broad leaf control. Roundup never was that great on broad leaf plants. You need to be using something else in your mix for them. I have not planted any soybeans for several years so I don't know the latest names for a residual chemical that is for broad left weeds in beans. I was using Roundup, AMS, 2-4 DB and Ultra Blazer 2L. This mix work very well and had residual action.

You are making a common mistake in your spraying system. Too many guys think that Roundup is the way to go since it had many generic products that are much cheaper. Roundup resistant weeds are very common now so spraying with more Roundup and four times is a mistake. You need to pick better products and maybe spray twice at the most.

Like some others have stated here, if you are no-tilling then you should be spraying in the fall to help with Mare's tail control also.

Roundup is a great product but guys trying to get even cheaper control started to cut rates and spray only once or spraying weed too tall quickly have made resistant weeds common. So now we are back to having to use different modes of action to control the different weeds.

I doubled up with Geo and 2-4d. Had to return with the d but looks like I made some headway. I let the field lay by last year and wound up with a horrible weed problem so I'm not surprised that they are hard to deal with this year.

Mark

You sprayed every 6 months, isn't that twice a year, not 4 times? Never mind, I miss read

Doesn't the 2-4D kill soybeans??? Did you just mean as a mix for burndown app's and not soybean post emergent?

Just confirming...

Thanks for the help - anyone ever use "FirstRate"??

Yes you can only use 24D at least one week BEFORE PLANTING.

2 0r 3 days and the vapor may kill the beans.

Gary

Tom you can spray 2-4 DB over the top of soybeans. Notice the extra letter in the name 2-4 DB. You have to have the rate right or it will stun the soybeans. It will also get some of the hard to control broad leaf weeds. It is not talked about mush because it is out of patent. The generics are cheap per acre. The chemical companies do like to talk about anything but the "new" high price stuff.

For the AMS - do you use a dry formulation which seems really inexpensive or the liquid form? Seems like the dry may slow loadin the tank - I have pretty rough ground but don't have a separate tank mixer...