Tuesday, November 6, 2007 - 2:15 PM

Transition Herbicide Effects on Overseeded Meadow Fescue and Tetraploid Ryegrass.

Ryan Rolfe1, Michael Richardson2, John Boyd3, John McCalla1, Aaron Patton4, and Doug Karcher1. (1) Horticulture, University of Arkansas, 316 Plant Science Bldg., Fayetteville, AR 72701, (2) 316 Plant Sci Bldg, University of Arkansas, University of Arkansas, Department of Horticulture, Fayetteville, AR 72701, (3) University of Arkansas, University of Arkansas Extension, PO Box 391, Little Rock, AR 72203, (4) Horticulture, University of Arkansas Cooperative Extension Service, 1 University of Arkansas, PTSC 316, Fayetteville, AR 72701

Two new species, meadow fescue (Festuca pratensis Huds.) and tetraploid (2n = 4x = 28) perennial ryegrass (Lolium perenne), have shown promise as alternative overseeding grasses for dormant bermudagrass turf. Initial studies indicate that these two species compare favorably to traditional overseeding species with regard to turfgrass performance. Therefore, optimal management practices for these species need to be defined so that they may be successfully integrated into overseeding programs. The objective of this study was to determine best management practices for the transition of meadow fescue and tetraploid ryegrass to bermudagrass. The study was conducted on two soil types, a native soil and a sand-capped soil. Three turf species, diploid perennial ryegrass, tetraploid perennial ryegrass and meadow fescue, as well as a non-overseeded control were used in this study. Ten herbicides treatments and an untreated control were evaluated at two different timings, 30% and 75% bermudagrass green-up. Traditional transition herbicides such as pronamide as well as numerous sulfonylurea herbicides were tested for phytotoxicity and efficacy at aiding transition.