June 24, 2013
nchris@iastate.edu
Here is some information from former graduate student, Nick Dunlap, on some work he is doing with bermudagrass control in ryegrass in Virginia.
From Nick Dunlap:
The images show the effect of topramezone on bermudagrass in bentgrass and ryegrass 4 days after treatment. Bleaching typical of HPPD inhibitors is easily seen on the bermudagrass. Topramezone was applied at 0.25 oz/acre and 0.75 oz/acre on bentgrass fairways and ryegrass shortcut, respectively. Both applications were applied through a carrier volume of 2 gal/acre.
Nick has been having pretty good luck turning the bermudagrass white, he will keep us posted about control.
I did some checking on this new product labeled as Pylex from BASF. Here is what I found at http://betterturf.basf.us/products/pylex-herbicide.html.
Pylex™ herbicide is the standard for the control of Bermudagrass and goosegrass in cool-season turf, providing unmatched performance on these difficult-to-eliminate weeds. It has also shown excellent control of nimblewill, crabgrass, clover, speedwell, and others. Pylex herbicide should always be used with a crop oil concentrate (COC) to improve herbicide coverage, resulting in improved weed control.
Pylex herbicide has shown it is safe to most cool-season grasses such as Kentucky bluegrass, tall fescue, fine fescue, and perennial ryegrass. It has shown varied tolerance on bentgrass (moderate to severe injury) and annual bluegrass (minimal to moderate injury) at labeled use rates. Warm-season turfgrass is sensitive to Pylex herbicide, with the exception of centipedegrass, which is tolerant.
The web indicates that it should be available by mid-June.
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