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Arkansas weed control: Use wrong herbicide, damage crop

Some callers have asked if Permit will hurt soybeans. Permit will “hammer” soybeans. Some people think Roundup Ready soybeans are even more sensitive than conventional soybeans.

I have had several calls this year regarding Permit drift to soybeans. Some were asking if Permit drift would hurt soybeans. Some were calling from injured fields asking what Permit injury would look like.

Due to the severity of the nutsedge problem, I have even had calls regarding the use of Permit in soybeans. In fact, I had one call from the field asking what would happen to his Roundup Ready soybeans if he mixed Permit with his Roundup. My reply was “it will kill them.” His response was, “Well, I guess that is what is wrong with mine. The soybeans are graveyard dead, but it sure did a good job on my nutgrass.”

Permit drift will “hammer” soybeans. Some people think Roundup Ready soybeans are even more sensitive than conventional soybeans. I would guess that is just because most of our soybeans are Roundup Ready.

I have been writing in recent weeks about herbicides that have looked good in rice this year. Another one that has really stepped up this year is Aim. It has looked much better in our plots this year, and I have had a lot of reports from growers who are very happy with it. One thing that has really helped is the formulation is much better this year.

I recently sprayed four 3-gallon cans of Aim with a backpack sprayer on a rice test. I was surprised that I finished the task with no stopped-up nozzles. When I finished, I looked at the screens and they looked like I had only been spraying water. In the past, it has often been so bad that we wouldn't get three steps into a plot before all six nozzles stopped spraying.

The performance of Aim plus crop oil alone has been impressive. It has been even more impressive when mixed with propanil. I have had a couple of calls from growers and consultants concerned about the amount of leaf burn on the rice, especially with some of the propanil mixtures. Sometimes you can get quite a bit of burn. It is worse if the rice foliage is wet. I routinely mix 3 to 4 pounds per acre of one of the propanil products with it and have never severely burned the rice. What burn I have seen has been cosmetic and is quickly outgrown.

In addition to propanil mixtures, Aim was a good early treatment tank-mixed with Ricestar. Ricestar plus Storm was often even more impressive as it controlled rice flatsedge. While Aim has been impressive on broadleaf weeds, including smartweed, it does not control, or in my work even suppress, rice flatsedge. Ricestar releases rice flatsedge about like Command. Where it is used following Command on flatsedge, treatment is often required.

Ford Baldwin is an Arkansas Extension weed scientist.
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