New weed species and resistance problems in 2012 are the ecosystem's response to our substantial changes in agronomy and weed management over the last two decades.

The widespread adoption of glyphosate tolerant cotton in the last 10 years has substantially modified the weed control practices used in irrigated and dryland cotton crops.

Data from last season was used to test the critical period for weed control approach for irrigated and dryland Roundup Ready Flex cotton crops.

Currently, the qualities that are being engineered into cotton relate to crop management issues such as insect-resistance (Frutos et al.