Bill Johnson

Purdue University researcher Bill Johnson says herbicide-resistant weeds cost U.S. farmers $2 – $3 billion a year. And considering how fast resistance is expanding through the soybean-producing region of the United States, that figure is likely still climbing.

“It is important for farmers to understand the weed problems faced in each and every field,” says Johnson.

“We have long since learned that a single weed control program will not work for every acre, especially in large operations. Constant attention to subtle changes in weed pressure and adjustments to those changes are needed to protect crop yields from weed competition.”