Golf Course Management

JUL 2013

Golf Course Management magazine is dedicated to advancing the golf course superintendent profession and helping GCSAA members achieve career success.

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Page 91 of 119

research New options for Poa annua control in bentgrass greens The fght against annual bluegrass in creeping bentgrass continues with two new herbicides. Annual bluegrass (Poa annua L.) is the most troublesome winter annual weed in managed turfgrasses, especially creeping bentgrass (Agrostis stolonifera L.) putting greens (11). In the southeastern United States, a perennial habit tends to dominate the annual bluegrass population in creeping bentgrass greens, as high input requirements during summer (syringing, fans, fungicide applications) allow annual bluegrass to survive. Control of annual bluegrass in creeping bent- Robert B. Cross Bert McCarty, Ph.D. Alan G. Estes 86 GCM July 2013 grass is diffcult to attain. Because both creeping bentgrass and annual bluegrass are cool-season species, herbicide selectivity is a challenge. In addition, golf greens are under constant cultural and environmental stresses, which herbicide applications often increase. Currently, plant growth regulators are the most viable labeled option for annual bluegrass seedhead control in creeping bentgrass greens. However, multiple applications are required This untreated control plot had heavy annual bluegrass infestations with a combination of perennial and annual biotypes. Photos by R. Cross

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