Glyphosate-Resistant Italian Ryegrass Management Considerations
Dr. Daniel Stephenson, LSU Extension Service Weed Specialist
Glyphosate-resistant Italian ryegrass has become a significant issue for Louisiana farmers, especially in the northeastern part of the state. I have been asked when ryegrass would begin to emerge. That answer can be tricky, but a good rule of thumb is this: when air temperature is less than 90 degrees for 7-10 consecutive days and soil moisture is not limited, then we should expect emergence.