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PBI-Gordon, Kumiai and Ihara Partner on New Active Ingredient

For Immediate Release
February 1, 2017

PBI-Gordon Corporation is proud to announce the company has entered into an exclusive partnership with Kumiai Chemical Industry Co. Ltd., and Ihara Chemical Industry Co. Ltd., of Tokyo, Japan, to develop herbicides containing the new, proprietary active ingredient Pyrimisulfan.

To be marketed under the Vexis brand name, the herbicide active ingredient will be formulated for use in established cool- and warm-season turfgrass species on residential and commercial sites, sports facilities, and golf course fairways and roughs.

"We're honored to partner with a global leader like Kumiai in the development of this exceptional product," said Mark Welterlen, vice president of Research and Development for PBI-Gordon. "Our test results on Vexis have been exciting, especially on sedges and kyllinga. Working with Kumiai, we're confident products containing Vexis will have a great impact on the consumer and professional turf industry."

Currently under independent and university testing, products containing Vexis show excellent control of sedges and kyllinga at a low active ingredient concentration rate. Tests are also being conducted on formulations featuring Vexis combined with other active ingredients for potential expanded broadleaf control and weed and feed products.

About Kumiai Chemical Industry Co., Ltd. Kumiai Chemical Industry Co., Ltd., began business when the agricultural chemical industry entered the modern era. Kumiai is proud that its corporate history parallels the agricultural chemical industry in Japan. Since formation in 1949, Kumiai has made significant contributions such as development of the first synthesized agricultural chemicals in Japan that have helped farmers realize bountiful harvests. For more information, visit

About Ihara Chemical Industry Co., Ltd. Since establishment in 1965, Ihara Chemical Industry Co., Ltd. has played a major role in the fine chemicals industry, in areas such as agrochemicals, agrochemical/pharmaceutical intermediates, and curing agents for urethane polymers. Ihara is primarily engaged as a manufacturer of proprietary active ingredients for agrochemical products, as well as contract manufacturing for customers. For more information, visit

About PBI-Gordon
With a full line of herbicides, insecticides, fungicides, growth regulators and other products, PBI-Gordon Corporation is a national leader in the professional turf and ornamental management industry. Based in Kansas City, Mo., PBI-Gordon has been in business since 1947, and is 100 percent employee-owned. For information on PBI-Gordon, visit, and for information on the company's professional chemical products, visit or call 800.884.3179.

Note to Media Vexis Herbicide is currently pending registration before the U.S. EPA and is not being offered for sale or distribution through this release.

Tom Mentzer
The Sandbox Agency (for PBI-Gordon)
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