Farmers need to be aware of herbicide carryover this fall

Purdue agronomists warn that this year's drought could mean problems for newly planted crops this fall.

Compiled by staff

Published: Oct 24, 2012

This summer's lack of rain has translated into the potential for summer-applied herbicides to carry over into winter wheat or even spring-planted corn and soybean crops - something growers need to be monitoring, two Purdue Extension weed scientists say.

In a normal year, soil moisture helps dissipate herbicide soil concentrations, but in a drought year, the lack of moisture slows that process. Some herbicides might carry over and exceed the labeled crop rotation restrictions meant to prevent injury to the next crop.

"The largest concern this year is the carryover of atrazine and subsequent injury on wheat," Bill Johnson said. "It is off-label to plant any crop other than corn or sorghum during the same calendar year of an atrazine application."

Labels vary on exact rotational restrictions, but most atrazine premix labels range 14-15 months.

Another herbicide with potential to injure wheat is fomesafen (Reflex and Flexstar) applied postemergence in soybeans. The wheat rotational restriction for fomesafen is four months after application, but in areas that saw the least rainfall, Johnson said the carryover could be longer.

"Producers who applied a fomesafen product to soybeans this summer and have not seen significant rain following application should be aware of the potential for injury on emerging wheat," he said.

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