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摘要

Reliance on the PPOs to control Palmer amaranth may ead to the next round of resistance. Eliminating herbicide-resistant weeds would be easy, that is if money were no object. But, marking a profit on the farm is essential to continuing, and it's working within the economical parameter that makes combating herbicide resistance such a challenge. For instance, tillage and cultivation are very effective methods of controlling weeds. As Eric Prostko, University of Georgia professor and Extension weed specialist likes to say, "there are still no steel-resistant weeds." It's the economics of returning to the use of tillage that would make it difficult. "Many growers are farming more acres than ever before, which would make it difficult for some to start doing more tillage and cultivation," Prostko says.