Annual bluegrass (Poa annua) continues to be the most problematic weed on golf courses worldwide. This cool-season plant is typically a winter annual but can adapt to a perennial life cycle. Selective removal in cool-season grasses has always been a challenge. In warm-season grasses, there are a great deal more effective herbicide options but due to the diversity of this species, resistance to herbicides has become a common problem. In this 90-minute webcast, Fred Yelverton, Ph.D., covers ecological adaptations of Poa annua on golf courses as well as selective removal and suppression. Programs that discourage the development of herbicide resistance are also discussed.