Glyphosate for Weed Control in Dormant Bermudagrass

Abstract

The control of winter annuals in dormant bermudagrass [ Cynodon dactylon (L.) Pers. ‘Common’] has not been consistent with available herbicides. Experiments were conducted to evaluate rates and number of glyphosate [ N -(phosphonomethyl)glycine] applications for control of winter annuals growing in dormant bermudagrass. Glyphosate applied as a single treatment at 0.6 kg/ha consistently controlled more parsley-piert ( Alchemilla microcorpa Boissier Reuter), corn speedwell ( Veronica arvensis L.), and henbit ( Lamium amplexicaule L.) than paraquat (1,1′-dimethyl-4,4′-bipyridinium ion) or combination treatments of 2,4-D [(2,4-dichlorophenoxy)acetic acid) + mecoprop 2[(4-chloro- o -tolyl)oxy] propionic acid + dicamba (3,6-dichloro- o -anisic acid). There was no difference between glyphosate and paraquat control of annual bluegrass ( Poa annua L.) and common chickweed [ Stellaria media (L.) Cyrillo]. Glyphosate treatments did not injure the bermudagrass the following spring.