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Arkansas weed control...

Care taken to protect new technology Last week I started discussing changes in our Extension weed control recommendations for 2001 and my thoughts on the processes on Section 18s. On the Clearfield rice issue that I discussed last week, we have had a lot of positive discussions with company folks about both the herbicide and seed.

We are currently growing in the greenhouse a large sample of red rice seed collected from our plots this year to check for any potential gene flow or outcrossing.

All University of Arkansas personnel who have responsibilities and inputs on a potential Section 18s will be meeting in early December. We want to bring this technology forward for Arkansas rice growers. We just want to make sure we are doing it in a manner that will minimize any potential outcrossing and preserve the usefulness of the technology.

One of the biggest frustrations all of the Mid-South states is having right now is how to deal with all of the glyphosate (Roundup and others) formulations in their recommendations. It seems as if every company is going to have a glyphosate and there are too many formulations to try to keep up with. We evaluate as many of them as we can.

When they are all compared on an equivalent active ingredient basis and a surfactant is added to those that do not already have one, they all perform about the same. We discussed this at length at our Delta Weed Workers meeting and it appeared that all of the states were going to recommend all of the glyphosates equally.

The problem is trying to cover them all in the written recommendations. In Arkansas, we are making an attempt to try to list them all. We are listing Roundup, Touchdown and equivalent 4 SL formulations together and then listing the Roundup Ultramax 5.0 SL formulation.

There are several formulations we did not try to get in. That doesn't mean we do not recommend them, it is just too large a hassle to get them all listed with their corresponding rates.

It is ironic that Touchdown for 2001 is going from a 5.0 SL to a 4.0 SL and Roundup Ultra is going from a 4.0 to a 5.0. It appears that "can 'em and confuse 'em" continues. Just pick whatever glyphosate formulation makes you happy and pick the rates on an equivalent basis back to the current 4.0 SL formulation.

The Gramoxone this year is going to be Gramoxone Max. It will be a 3.0 SL formulation instead of the current 2.5. This is the third or fourth formulation change we have had on it the past few years. With it, however, we just changed all of the Gramoxone Extra 2.5 to Gramoxone Max 3.0 in the recommendations.

We added Aim to our rice weed control recommendations. It has performed well on small broadleaf weeds such as coffeebean, morningglory and indigo. It can be compared to Blazer or Storm on a lot of weeds - especially as far as weed size is concerned. Like most herbicides, it looks much better when tank-mixed with propanil. That is the way we will primarily recommend it.

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