Bayer’s Revolver takes aim at ryegrass and Poa

Bayer’s Revolver takes aim at ryegrass and Poa

Overbeck, Andrew

ATLANTA – Bayer Environmental Science’s Chipco Professional Products division unveiled Revolver, a herbicide formulated specifically for use on warm-season turf, here at the GCSAA Conference and Show. It is the first of many new products that are expected to emerge from the newly combined Bayer and Aventis CropScience.

Work on the product began in 1998 under Agrevo, and received approval from the U.S. Environmental Protection Agency Feb. 6.

Revolver is a post-emergent sulfonylurea herbicide that is squarely aimed at Griffin LLC’s TranXit, which contains similar chemistry and came on the market last year. Its primary use will be in aiding the transition between ryegrass and bermudagrass on courses that overseed. It can also be used to combat Poa annua.

The product will be labeled for use on bermuda (except for ultradwarfs) and zoysia turfgrasses and can be used on the entire course, including greens. It will not be labeled for use on St. Augustine or paspalum varieties. Bayer is currently conducting studies to determine whether the product can eventually be safely applied on ultradwarf bermudagrasses such as Mini-Verde, MS-Supreme and Champion.

“Revolverremoves cool-season grass from warm-season grass,” said Don Myers, product development manager for Bayer ES. “It will aid in the transition from overseeding, get rid of the clumpy ryegrass that has gotten into roughs and it is useful for the removal of Poa annua. This will truly be a Southern herbicide.”

Proper application timing is critical to the effectiveness of the new herbicide.

“Revolver is a very flexible product,” said Myers. “But it must be applied in warmer weather for maximum effect. It can be applied in the fall four weeks before overseeding and in other seasons on nonoverseeded bermudagrass to control Poa. And when it warms up in spring it can be used to kill ryegrass and allow for the bermuda to get re-established.”

Myers said the market is still developing for Revolver and other similar products that provide an alternative to a natural overseeding transition.

“We have to convince the superintendent that there is value in a chemical transition,” he said. “A chemical transition helps build a better base of bermudagrass and it means less problems with volunteer ryegrass that happens during a natural transition process. Those clumps of ryegrass are hard to control.”

Down the road, Myers said Bayer ES is also looking at the possibilities of tank-mixing the low-risk, reduced-rate herbicide with other broad spectrum herbicides like Sencor and MSMA. Testing is also underway to determine whether Revolver is effective in the control of dallisgrass.

Copyright United Publications, Inc. Mar 2003

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