Herbicide-resistant “super weeds” are a threat to adoption of conservation tillage in the South, says Southeast Farm Press. In its story, a USDA weed scientist says hundreds of thousands of conservation tillage acres are at risk of being converted to higher-intensity tillage systems that bury weed seeds and allow use of pre-plant incorporated herbicides. Besides well-known Palmer amaranth, herbicide-resistant marestail and Italian ryegrass are problems in Alabama. Conservation tillage was being promoted as a way to build organic matter in soil.