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May 11, 2007

State chemist issues a crisis exemption to help corn growers

WEST LAFAYETTE, Ind. - Bob Waltz, Indiana state chemist and seed commissioner, declared a crisis exemption on Friday (May 11) to allow the use of Select Max brand herbicide to control poor stands of glyphosate-resistant corn prior to replanting corn.The freezing temperatures that Indiana experienced during April, excessive May rainfall in northern Indiana and extremely dry conditions in eastern Indiana injured early planted corn to the point where some replanting is necessary.

"As of May 11, approximately 3,000 to 4,000 acres are in need of replanting," said Bill Johnson, Purdue Extension weed scientist.

"Before growers replant, they need to control the existing corn plants. Otherwise, they will essentially be weeds and reduce the yield of the new crop that is planted," Waltz said.

For growers using a glyphosate-resistant corn variety, getting rid of the existing stand would be a challenge because glyphosate alone cannot be used to kill the surviving corn plants.

"It's prime planting season," Waltz said. "Without the use of Select Max herbicide, many growers would be in economic jeopardy."

Select Max, manufactured by Valent USA Corp., should be applied at a rate of 4 ounces per acre as a burndown herbicide prior to replanting corn.

When significant losses to an agricultural commodity are likely and registered products are ineffective or unavailable, the Office of the Indiana State Chemist (OISC) has authority to declare that a crisis exists and to issue a crisis exemption under Section 18 of the Federal Insecticide, Fungicide and Rodentcide Act to allow the use of a non-registered pesticide to address the emergency conditions.

The Purdue-based OISC is Indiana's pesticide regulatory agency.

Writer: Julie Douglas, (765) 496-1050, douglajk@purdue.edu

Sources: Bob Waltz, (765) 494-2, rwaltz@purdue.edu

Bill Johnson, (765) 494-4656, wgjohnso@purdue.edu

Ag Communications: (765) 494-2722;
Beth Forbes, forbes@purdue.edu
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