June 24, 2013
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.
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.