Crabgrass and Goosegrass Control in a Bentgrass Green in the Transition Zone1

Abstract

AbstractA creeping bentgrass (Agrostis palustris Huds. cv. Penncross) high porosity green was treated with ethofumesate (2‐ethoxy‐2,3‐dihydro‐3,3‐dimethyl‐5‐benzofuranyl methanesulfonate), metribuzin [4‐amino‐6‐(1,1‐dimethylethyl)‐3‐(methylthio)‐1,2,4,‐triazin‐5(4H)‐one], NC‐20484 (structure undisclosed, belongs to benzofuran group), napropamide [N,N‐diethyl‐2‐(l‐naphthalenyloxy)propanamide], oxadiazon {3‐[2,4‐dichloro‐5‐(1‐methylethoxy)phenyl]‐5‐(1,1‐dimethylethyl)‐1,3,4‐oxadiazol‐2‐(3H)‐one}, and prosulfalin (N‐[4‐(dipropylamino)‐3,5‐dinitrophenyl]sulfonyl}‐S,S‐dimethylsulfilimine) to determine phytotoxicity and effectiveness in controlling large crabgrass (Digitaria sanguinalis L. Scop.) and goosegrass [Eleusine indica (L.) Gaertn.]. No sod loss occurred with a 1‐yr treatment of prosulfalin at 3.4 and 6.7 kg ha−1 or ethofumesate at 1.1 kg ha−1. Repeat treatments for 3 more years at reduced rates resulted in no sod loss with ethofumesate or NC‐20484 at 0.6 and 1.1 kg ha−1, oxadiazon at 2.2 and 4.5 kg ha−1, and prosulfalin at 1.7 and 3.4 kg ha−1. Single and sequential treatments of oxadiazon and prosulfalin, at both rates for each, gave 96 to 100% control of crabgrass. Only oxadiazon at 4.5 kg ha−1 and prosulfalin at 3.4 kg ha−1 gave 91 to 100% control of goosegrass. There was no evidence of herbicide residue buildup from treatments to the same plots during four successive years in the high porosity green (95.3% sand, 3% silt, 1% clay, 0.7% OM by weight).