Tolerance of different grass species to repeated application of NEU1173H – 2011 trial

Carey, K.
Porter, A.J.
Lyons, E.M.
Jordan, K.S.
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Guelph Turfgrass Institute

Herbicide NEU1173H decreases density and leaf rust when applied to turf. The intent of this study was to determine the crop tolerance of perennial ryegrass, Kentucky bluegrass, and fine fescue against the herbicide treatments of NEU1173H. Seven treatments of herbicides were applied to the turfgrass species in a randomized control setting. All three species were exposed to disease outbreaks and were affected by Fiesta treatment. The results showed thinning in the density of Kentucky bluegrass and perennial ryegrass. A correction was found relating weed growth in Kentucky bluegrass and fine fescue plots with an application rate of NEU1173H. All turfgrass used in the study saw a decrease in canopy reduction after the application of 400 ml m-2 Fiesta. All the trials of Fiesta showed lowered outbreaks in leaf rust when applied to perennial ryegrass plots. However, by the end of the season, the turf in all treatments had fully recovered to untreated control levels. It has been recommended that further study be done on the disease effects.

Guelph Turfgrass Institute, 2011, Annual reports, Kentucky bluegrass, NDVI, perennial ryegrass, fine fescue, NEU1173H, herbicide, Fiesta, Par III, leaf rust, patch disease, weed, tolerance, dollar spot