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Loyant herbicide approved for use in rice in 2018

EPA registration will provide new broad spectrum tool for rice growers in 2018.

Loyant with Rinskor active may provide the broadest spectrum control of any new rice herbicide in years, but Dow AgroSciences representatives are recommending the newly-registered herbicide be part of a program approach to weed management.

EPA issued a Section 3 federal registration for the new herbicide on Monday (Sept. 25). Loyant, an arylpicolinate herbicide, is the first new such product to be introduced in rice or any other major row crop in years.

“I think what Loyant is going to bring to the rice community and the farmer is a robust herbicide solution,” says Hunter Perry, field research and development specialist with Dow AgroSciences. “If you just sit back and simply look at the spectrum that Loyant is going to be bringing to the grower we pick up problematic sedges – rice flatsedge and yellow nutsedge. We control barnyardgrass and broadleaf signalgrass.

“We suppress some sprangletop species, but we pick up a myriad number of broadleaves and aquatics, as well as broadleaves that we once thought would never be a major problem in rice like Palmer amaranth. Loyant is very effective. It’s going to bring a safe solution. It’s going to bring a good partner to a lot of the products that are currently being used by growers today.”

Tank mix partner

Dr. Perry was speaking at a media event at the research farm owned and operated by former University of Arkansas weed scientist Ronnie Helms near Stuttgart, Ark. The research plots at the farm demonstrated how Loyant can work alone and in combination with other herbicides.

“We at Dow feel that Loyant can be the core of a weed management program across the Mid-South just due to the robust nature of the product,” he said in an interview following a tour of the research plots.

The plots featured a number of combinations of Loyant with other older herbicides such as Command, Clincher, Grasp, Newpath and a relatively new rice herbicide quizalofop, which BASF expects to offer as Provisia herbicide on the new Provisia rice variety in 2018.

“Loyant is a very robust herbicide – it has a very broad spectrum when it comes to grasses, sedges, broadleaves, as well as aquatic broadleaves,” Dr. Perry said. “However, we live in a day and age where one of the biggest things we’re being told is to use multiple modes of action; tank mixing modes of action; sequential modes of action.

“The purpose of this is No. 1 we want to preserve the products that are on the market today that are still achieving very effective weed control. However, you have a new product like Loyant coming on to the market which has never been applied to the vast majority of weeds in the Mid-South.”

Preserving mode of action

Dow AgroSciences obviously wants to preserve Loyant’s mode of action for as long as possible, he said. “By tank mixing and by adding it in a sequential application and in a program we’re not only preserving Loyant, but we’re preserving other herbicides that have been in the market for years that are still very efficacious.”

Dr. Perry said Dow AgroSciences researchers have found Loyant “to be a very good tank mix partner with residual products such clomazone or Command. It’s a very good partner for other postemergence products such as Newpath in the Clearfield system, and we’re very excited about its use with the quizalofop tolerance system, as well.”

For more information on Loyant, visit

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