Weed expert warns of increasing occurrences of super-weeds

April 22, 2004: There are some 300 varieties of herbicide-resistant weeds worldwide, according to weed expert Bill Johnson.

“There are many reasons why herbicide resistance is a growing concern,” said Johnson, a specialist with Purdue University Extension. “Among them the widespread adoption of Roundup Ready soybeans, increased use of no-till practices and the lack of cheap herbicide alternatives to glyphosate (aka Roundup).”

Johnson has been researching the trend of super-weeds, especially glyphosate-resistant horseweed, as they spread across southeast Indiana, a region specifically plagued by the plants.

“We’ve found glyphosate-resistant horseweed in Bartholomew, Clark, Jackson and Washington counties,” he said. Resistant horseweed also is suspected in the nearby counties of Jefferson, Jennings, Scott, Shelby, Decatur and Ripley.

According to Johnson, more pesticides, at least two different varieties, and more applications, beginning in April are the best ways to destroy the weeds.

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