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College of Food, Agricultural, and Environmental Sciences


Updated Weed Management Resources Now Available

January 14, 2008

COLUMBUS, Ohio -- New herbicides for 2008 are included in the latest version of Weed Control Guide for Ohio and Indiana, now available through Ohio State University Extension and Purdue University Extension.

The publication, updated every year, includes new herbicides that received federal registration by September 2007, as well as pertinent label changes. The weed control guide can be purchased for $8.50 through county Extension offices in Ohio and Indiana or by calling the OSU Extension publications office at (614) 292-1607. The bulletin can also be viewed online at

New herbicides listed in the 2008 guide include: Authority First/Sonic, Authority MTZ, Envive, Valor XLT, Halex GT, SureStart, and Prefix.

New changes to the guide include the modification of tables outlining herbicide effectiveness, product ratings for residual and postemergence control of marestail in soybeans, and the addition of herbicide resistance in common and giant ragweed ratings.

"Problem Weed" information has also been updated to include specific recommendations for various types of resistance in ragweeds and marestail.

Other weed management resources available to producers include a bulletin series on glyphosate, weeds, and crops -- developed by national Extension weed specialists. The bulletins cover such topics as facts about glyphosate-resistant weeds, understanding glyphosate to increase performance, corn and soybean herbicide charts, and the biology and management of horseweed, wild buckwheat, common lambsquarter, giant ragweed and waterhemp. The bulletins can be found at, or be obtained for free by contacting OSU Extension weed specialist Mark Loux at (614) 292-9081 or

Additional fact sheets on weed management can be found at Such materials include control of lambsquarters in corn and soybeans, the benefits of pre-emergence herbicides in Round-Up Ready soybeans, and controlling kochia and palmer amaranth in warm-season grass stands and cropland.

Candace Pollock
Mark Loux