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Journal of Aquatic Plant Management, Volume 45, 2007. Pages
43-46.
"Eurasian Watermilfoil and Parrotfeather Control Using
Carfentrazone-ethyl"
Cody J. Gray, J.D. Madsen, R.M. Wersal and K.D. Getsinger
ABSTRACT
Two invasive weed species, Eurasian watermilfoil (Myriophyllum spicatum L.)
and parrotfeather [Myriophyllum aquaticum (Vell.) Verdc.], were grown in outdoor
mesocosms to determine the efficacy of carfentrazone-ethyl
(a,2-dichloro-5-[4-(difluoromethyl)-4,5-dihydro-3-methyl-5-oxo-1H-1,2,4-triazol-1-yl]-4-fluorobenzenepropanoic
acid, ethyl ester), alone and in combination with 2,4-D, a herbicide routinely
used for watermilfoil control. Eurasian watermilfoil control was ≥ 98% when
carfentrazone rates were applied alone at ≥ 150 μg ai L-1.
Carfentrazone alone initially controlled parrotfeather; however, tissue
viability 3 weeks after treatment suggested plant recovery was likely. Both
Eurasian watermilfoil and parrotfeather control was 100% when 2,4-D was applied
at 1000 μg ae. L-1; however, when 2,4-D rate was reduced to 100 μg ae L-1
control declined to <50%. Herbicide applications containing carfentrazone with
low rates of 2,4-D resulted in 100% death of both plant species. These results
indicate that Eurasian watermilfoil control can be obtained using carfentrazone
alone; but the addition of low levels of 2,4-D may be needed to achieve desired
parrotfeather control.

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