American Cyanamid is seeking registration from the U.S. Environmental Protection Agency to market Extreme herbicide for in-crop use on Roundup Ready soybeans, in time for the 2000 season.

Extreme is a new herbicide premix for soybeans that combines Pursuit herbicide, the leading residual soybean product, with glyphosate, the active ingredient in Roundup herbicide.

"Extreme combines the proven contact control of glyphosate with the residual control from Pursuit to create a superior alternative to stand-alone applications of Roundup Ultra herbicide on Roundup Ready soybeans," says George Fennell, Cyanamid business director, soybean herbicides.

"Growers clearly recognize the residual attributes of Pursuit, along with the contact activity of glyphosate," says Fennell. "Combining the two in an easy-to-use premix provides growers with a new level of weed control."

Pending registration, the proposed use rate for Extreme is three pints per acre on weeds up to eight inches tall. Extreme reduces the need for a second application of Roundup Ultra by controlling late flushes of weeds, like nightshade, morningglory, velvetleaf and foxtail. In all, Extreme will be labeled for control of more than 50 broadleaf weeds and grasses.

In spring, 1999, Forward Research, Inc., St. Louis, surveyed 563 growers in major soybean production areas to determine interest in a new category of soybean herbicide premixes, consisting of glyphosate and residual herbicides.

"Over 85% of growers have expressed an interest and need for a premix that combines glyphosate and proven residual herbicides," according to Fennell. "We intend to fill this unmet need with premixes of Cyanamid's herbicides and glyphosate. Seventy-nine percent felt a product containing glyphosate and a residual herbicide would be an improvement over their existing Roundup Ultra herbicide program."

Extreme will be marketed to soybean producers in the northern and southern Corn Belts in 2000.

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