Response of creeping bentgrass to spring-applied herbicides.
1992
Shim S.R. | Johnson B.J.
Creeping bentgrass (Agrostis palustris Huds.) putting greens are commonly infested with crabgrass (Digitaria spp.) and goosegrass [Eleusine india (L.) Gaertn.]; however, many herbicides have the potential to severely injure this turfgrass species. A field investigation was conducted over 2 years to determine the tolerance of creeping bentgrass to various herbicides. Trifluralin plus benefin (2.2 to 6.7 kg.ha-1), dithiopyr (0.37 to 1.1 kg.ha-1), and prodiamine (0.5 to 1.7 kg.ha-1) did not injure creeping bentgrass. Pendimethalin caused only slight injury when applied at 3.4 kg.ha-1, but injury increased in 1 of 2 years when applied at greater than or equal to 6.7 kg.ha-1. Creeping bentgrass was severely injured when treated with benefin plus oryzalin (greater than or equal to 4.5 kg.ha-1), fenoxaprop (0.07 kg.ha-1), and oxadiazon (3.4 kg.ha-1) granular and WP formulations and, therefore, should not be applied to the turf.
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