Epidemic in Turf Management: Herbicide Resistance in Annual Bluegrass

by Patricia McDaniels, University of Tennessee
Annual bluegrass is one of the most common weeds of turfgrass on golf courses, sports fields and sod farms, not to mention residential and commercial lawns. Unfortunately this nemesis of pristine landscapes has also developed resistance to many common herbicides. Researchers with the University of Tennessee Institute of Agriculture are participating in a national effort to address what many landscape managers call an epidemic of herbicide resistance in annual bluegrass plaguing managed turf systems.
As part of a $3.2 million, 15-state USDA Specialty Crop Research Initiative grant, UTIA turfgrass researcher Jim Brosnan will lead a team of Tennessee weed scientists in sampling annual bluegrass populations across the state. The team will travel the state’s three grand divisions to take samples from golf courses, sports fields, both residential and commercial lawns, as well as sod production farms. The sampled specimens will then be propagated in a controlled laboratory setting and tested for resistance to commonly used herbicides. The goal is to quantify the scope of herbicide resistance in annual bluegrass populations across Tennessee. Additionally, Brosnan’s team will also be developing new diagnostic assays to detect herbicide resistance in annual bluegrass, researching annual bluegrass seed persistence in soil, as well as the effects of turfgrass cultural practices on annual bluegrass infestation.

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Options to address ryegrass for warm-season forage production

by Adam Russell, Texas A&M AgriLife

Producers hoping to mitigate annual ryegrass growth for warm-season hay production have options and should start sooner than later, said a Texas A&M AgriLife Extension Service expert.

Annual ryegrass, a cool-season forage, is often utilized by livestock producers for winter grazing, said Dr. Vanessa Corriher-Olson, AgriLife Extension forage specialist, Overton. However, East Texas hay producers often view it as an unwanted species that competes with Bermuda and Bahia grasses, she said. Continue reading

IPM for annual ryegrass control

Texas IPM agent Jim Swart and a few of his colleagues provide a detailed description of chemical, mechanical and cultural methods to undertake to control herbicide-resistant ryegrass in Texas.

Read the article at Southwest Farm Press.