Round up

Chester5731 · Aug 2, 2010

I am not an advocate for or against roundup and gmo seed but I do have one question for those of you that use it. What do you use when the weeds start becoming roundup resistant. It is starting around here like it did when everyone used atraizine on the corn. Now no one uses atrazine because it only kills part of the weeds. Just a thought.

kyhayman · Aug 2, 2010

I've yet to see a case of RR resistence in this area. To me, using RR seed has a place in the tool box, but it shouldnt become the only tool in the box. I like to use a preemergent herbicided in first year corn in addition to Roundup. In the following wheat crop 2,4-D, then in the following corn crop the second year roundup is usually sufficient. Then back to notill alfalfa.

bjb in TX from Ne · Aug 2, 2010

Farmers are going to have to use a different chemical/gmo pair, or go back to some sort of mechanical weed removal. Same problem arises with the overuse of antibiotics.....

Bill(Wis) · Aug 2, 2010

I rotate with conventional corn one year and roundup ready soybeans the next using pre-emergence with no roundup on the corn. My cornfields are vertually weed free and by using only minimum tillage I get away with only one application of roundup on the soybeans. As long as you don't stir the ground up too much you can handle weeds with this type of approach. I have noticed no roundup resistance whatsoever. If that becomes a problem, Monsanto will have to come up with a new product. Roundup is going on a 30 year run. Not bad.

JDseller · Aug 2, 2010

I rotate what weed control I use. I almost never use the same thing twice in a row. Round Up works well on grasses but not on many broad leaf weeds. So I usually tank mix something with it any way.

RodinNS · Aug 2, 2010

I've yet to see Roundup resistance other than in some plants that are simply not susceptable to glyphosate.
Using an adequate amount to kill the plant rather than innoculate it agains the product is the first step...
I also don't use roundup when another cheaper product or somethign with a different mode of action will work equally well. Roundup Ready seed doesn't fit into what I grow anyhow so I don't worry about that.
BT corn does... and I do use that...

Rod

paul · Aug 2, 2010

I've been using LibertyLink in tests the last 2 years, seems to work well.

You can tank mix some of the old standbys with RU which is happening more & more.

Mare's tail is getting resistant to 5 different chemicals now, so that's gonna be a tough one some day.

I remember when Persuit came out, wow clean bean fields!!! That lasted about 3 years....

Resistance is nothing new. Need to manage it from the toolbox. The problem is there are not many new tools being developed.

--->Paul

Eric in IL · Aug 2, 2010

Waterhemp, marestail, and giant ragweed are a few that are resistant on my farm. Roundup was too easy/cheap, lots of guys threw stewardship out the window, especially when the generic glyphosates came along. Some in my area sprayed glyphosate three times a season in the same field on resistant weeds. Now these weeds are approching total immunity, or at least that is what it looks like to me.

Now, we are offered very few corn or bean varities void of the Roundup trait. To select a variety that is not RR usually means sacraficing yield. So if you are not using Roundup, but still want the latest/greatest yielder you still need to donate the tech fee to Monsanto.

Kinda seems like paying for nothing to me?? Guess it is like paying a royalty on something that used to work.

Sorry for the rant.

As to your question, I am going to try seeding rye in the corn stalks this fall, then- you guessed it- burn with glyphosate and no-till beans next spring. Hoping the dead rye will supress some weed pressure. So far the rye doesn't seem resistant.

msb · Aug 2, 2010

Round Up resistant weeds were first discovered in Australia of all places. I think it is only a matter if time before GMO crops will also fail us from over use. I am two steps ahead of the crowd. No GMO crops for 2 years here.

Anonymous-0 · Aug 2, 2010

Sourdock is the only thing resistant on my farms but rotate crops of corn three years non round up first year then ru the next two fourth year seeded down to alfalfa with oats as a cover crop then hay for two years then back to corn!

locojim · Aug 2, 2010

(quoted from post at 07:27:19 08/02/10) Farmers are going to have to use a different chemical/gmo pair, or go back to some sort of mechanical weed removal. Same problem arises with the overuse of antibiotics.....

Now that sounds too much like work

Rootsy · Aug 3, 2010

resistance develops due to a couple of factors. 1) reduced rates to save money and 2) spraying weeds that are too large where you don't get a kill.

In both instances you just slap the weed on the cheek and it keeps on growing. Except it and it's offspring have now learned how to duck... The duck and weave will get better with future generations that get slapped lightly year after year.

Round up

Chester5731

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kyhayman

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bjb in TX from Ne

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Bill(Wis)

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JDseller

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RodinNS

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paul

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Eric in IL

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msb

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Anonymous-0

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locojim

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Rootsy

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