Evaluation of 2,4-D and 2,4-D mixtures for path rush control in bermudagrass.
Path rush (Juncus tenuis) can become problematic on golf course fairways, especially on roughs where continuous golf cart or maintenance equipment traffic occurs. An experiment conducted in 2003 and 2004 compared the efficacy of 2,4-D and mixtures containing 2,4-D in single or sequential applications to herbicide combinations without 2,4-D for path rush control in bermudagrass (Cynodon dactylon) roughs. The sequential application of 1.1 kg 2,4-D a.e./ha or 0.8 + 0.2 + 0.1 kg 2,4-D + MCPP [mecoprop] + dicamba a.e./ha provided 95% path rush control with no injury to bermudagrass at 15 weeks after initial treatment (WAIT). Single applications of 1.1 + 0.3 + 0.1 kg 2,4-D + MCPP + dicamba or 1.1 kg 2,4-D/ha provided at least 81% path rush control at 15 WAIT. Treatments without 2,4-D did not provide acceptable levels of control (≤34% at 15 WAIT). 2,4-D applied alone or in preformulated mixtures provided excellent path rush control compared to treatments without 2,4-D. Sequential applications of these treatments provided greater path rush control than single applications. However, only the sequential application of 0.8 + 0.2 + 0.1 kg/ha 2,4-D + MCPP + dicamba provided greater path rush control than the single application. The results suggested that 2,4-D is a key herbicide for path rush control.