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Mixing Roundup and residual

New herbicide premixes with Pursuit and Scepter are ready for 2000.

Soybean growers may choose two new herbicides from American Cyanamid for use on Roundup Ready (RR) soybeans next spring: Extreme and Backdraft.

Extreme combines the residual control of Pursuit with the glyphosate found in Roundup. Backdraft combines the burndown activity of glyphosate with residual control of Scepter designed for southern applications. The company expects final registration approval for both products this winter from the EPA.

Farmer driven. The development of the premixes marks a change in the way products usually are brought to market. Typically a company develops product ideas, tests them in the market and releases them if the interest is there. In this case, however, the company asked farmers about their chemical needs first and then developed the two premixes.

Cyanamid conducted extensive interviews with growers and hired researchers to determine grower needs. Overwhelmingly, the growers reported they wanted a product to provide residual weed control in addition to the contact control of Roundup. Such a product would keep soybean fields clean through the growing season, which the growers rated as being very important to them.

"We learned farmers understand residual activity and know how to use it," reports Cyanamid product manager Jeff Klock. "We tested to see if growers were interested in Roundup with Pursuit. They showed us they were if it was priced to value." As a result, Cyanamid signed an agreement with Monsanto to use the glyphosate found in Roundup.

Dual control in the Cornbelt. Growers in the Cornbelt may use Extreme for burndown and residual control of many broadleaf and grassy weeds in soybeans. It may be applied to no-till soybeans before planting, which is earlier than farmers are able to apply Roundup Ultra. Or growers may apply Extreme postemergence to RR soybeans for weed control.

The company reports that Extreme controls late flushes of weeds like nightshade, morningglory, velvetleaf and foxtail, eliminating the need for a second application of Roundup Ultra. Extreme will be labeled for control of more than 50 broadleaf weeds and grasses.

The rate of application is 3 pts./acre on weeds up to 8 in. tall. It will be available in bulk and 2_1/2-gal. jugs.

A southern product. The company's other new product, Backdraft, offers soybean growers in the southern Cornbelt and mid-south extra weed control. Usually, southern growers make three applications of Roundup to control weeds: burndown, early postemergence and late postemergence. Backdraft may be used for burndown and residual control, eliminating one Roundup application. Weeds like teaweed, morningglory and smartweed are controlled until the second application of Roundup. The premix also may be applied postemergence to RR soybeans.

The product is applied at 1_1/2 to 2 qts./acre as a burndown at planting. At this rate, it treats 2 to 2.7 acres of soybeans. The company recommends following it with a post application of Roundup Ultra herbicide.

The active ingredients in Extreme are imazethapyr and glyphosate. In Backdraft, the active ingredients are imazaquine and glyphosate.

Both products will be priced competitively with Roundup. For more information, contact American Cyanamid Co., Dept. FIN, North America Agricultural Products Div., Crop Protection Products, One Campus Dr., Parsippany, NJ 07054, 973/683-2000.

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