Study Shows Few Control Options Remain for Annual Bluegrass in Turf
1 July 2020
Last update: 01/07/20 10:10
Greenskeepers and landscape managers may be losing their battle with annual bluegrass – an unsightly weed that competes with desirable turf and produces an uneven surface for golf and other sports. Multiple turf herbicides have been used to control annual bluegrass, but it now has evolved resistance to almost all of them.
In a study featured in the journal Weed Science, researchers explored 31 populations of annual bluegrass growing on golf courses in Australia. The team confirmed that all 31 were resistant to multiple turf herbicides. Three had evolved resistance to five different herbicide mechanisms of action.
The study confirmed instances of resistance to propyzamide, simazine, rimsulfuron, foramsulfuron, endothall and pinoxaden. Levels of resistance ranged from more than two-fold for propyzamide and simazine to more than 56-fold for rimsulfuron.
The bottom line: The options for effective control of annual bluegrass in turf are narrowing.
Want to learn more? You can read the article “Incidence of multiple herbicide resistance in annual bluegrass (Poa annua) across southeastern Australia” by Rajesh Barua, Peter Boutsalis, Jenna Malone, Gurjeet Gill and Christopher Preston, free for a month, at Weed Science, Volume 68, Issue 4.
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