Carfentrazone-ethyl Pond Dissipation and Efficacy on Floating Plants
Carfentrazone-ethyl (CE) is a reduced risk herbicide thatis currently being evaluated for the control of aquatic weeds.Greenhouse trials were conducted to determine efficacy ofCE on water hyacinth (Eichhornia crassipes(Mart.) Solms-Laub.), water lettuce (Pistia stratiotesL.), salvinia (SalviniaminimaBaker) and landoltia(Landoltia punctata(G. Mey.)Les & D. J. Crawford). CE controlled water lettuce, water hyacinthand salvinia at rates less than the maximum proposeduse rate of 224 g ha-1. Water lettuce was the most susceptibleto CE with an EC90of 26.9 and 33.0 g ha-1in two separate trials.Water hyacinth EC90values were calculated to be 86.2 to116.3 g ha-1, and salvinia had a similar susceptibility to waterhyacinth with an EC90of 79.1 g ha-1. Landoltia was not adequatelycontrolled at the rates evaluated. In addition, CE wasapplied to one-half of a 0.08 ha pond located in North Central,Florida to determine dissipation rates in water and hydrosoilwhen applied at an equivalent rate of 224 g ha-1. Thehalf-life of CE plus the primary metabolite, CE-chloropropionicacid, was calculated to be 83.0 h from the whole pond,and no residues were detected in water above the limit ofquantification (5 μg L-1) 168 h after treatment. CE dissipatedrapidly from the water column, did not occur in the sedimentabove the levels of quantification, and in greenhousestudies effectively controlled three species of aquatic weedsat relatively low rates.(PDF contains 6 pages.)
| Main Authors: | , , |
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| Format: | article biblioteca |
| Language: | English |
| Published: |
2004
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| Subjects: | Management, Biology, Limnology, Salvinia minima, Landoltia punctata, Pistia stratiotes, Eichhornia crassipes, protox inhibitor, half-life, |
| Online Access: | http://hdl.handle.net/1834/19631 |
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