Submitted to: HortScience
Publication Type: Abstract Only
Publication Acceptance Date: 7/23/1997
Publication Date: N/A
Technical Abstract: Annual ryegrass (Lolium multiflorum), which grows prolifically during the strawberry production season in the Gulf South, has the potential to serve as a living mulch if its growth is controlled. Sublethal dosages of Embark, a plant growth regulator, and the herbicides Post and Rely were determined on ryegrass. Growth retardation was rated from 0 = none to 6 = dead. In 1993, all Poast dosages (1/8X - 1X, where X = 8 ml/1) were lethal. Embark regulated ryegrass growth but its study was discontinued because of the unlikelihood that it could be labeled for use on strawberries. Results of the 1994 study suggested that prime oil in the spray may cause an inordinate amount of vegetative browning. In 1995, 3 levels of oil (1/256X, 1/64X, and 1/32X, where X = 8 ml/1) were used with each of 4 levels of Poast (0, 1/32, 1/64 and 1/128X). Increased levels of oil generally caused increased browning at each level of Poast but no browning occurred where oil only was applied in the spray. In contrast to results in 1995, oil at 1/32X with no Poast caused considerable browning (score = 3.25) in 1996. The most desirable control (score = 2.75) was accomplished by a spray containing 1/128X Poast and 1/64X oil. The most desirable control by Rely (score = 3.25) was accomplished by 1/64 and 1/32X sprays. Rely is not labeled for strawberries although it is labeled for other fruit crops. Chemical names used: 2-[1-(ethoxylmino)buty1]-5-[2- (ethylthio)propy1]-3-hydroxy-2-cyclohexen-1-one(poast); Paraffin Base Petroleum Oil + polyol Fatty acid Esters (Prime oil); N-[2,4dimethyl-5- [[(trifluoromethyl)-sulfony]amino]phenyl] acetamide (Embark); ammonium-Dl- homoalanin-4-yl-(methyl) phosphinate (Rely).