Persistence and Non-target Impact of Imazapyr Associated with Smooth Cordgrass Control in an Estuary

The herbicide ( plus or minus -2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H- imidazol-2-yl]-3-pyridinecarboxylic acid (imazapyr) has shown potential to control smooth cordgrass (Spartina alterniflora Loisel), a noxious weed in many estuaries throughout the world. Research was conducted under t...

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Bibliographic Details
Published in:Journal of aquatic plant management 2003-01, Vol.41 (1), p.1-6
Main Author: Patten, K
Format: Article
Language:English
Subjects:
Brackish
Spartina alterniflora
Zostera japonica
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Summary:The herbicide ( plus or minus -2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H- imidazol-2-yl]-3-pyridinecarboxylic acid (imazapyr) has shown potential to control smooth cordgrass (Spartina alterniflora Loisel), a noxious weed in many estuaries throughout the world. Research was conducted under tidal estuary conditions in Willapa Bay, Washington, to determine imazapyr's persistence and aquatic risk and impact to non-target estuary species. Persistence of imazapyr in water and sediment followed an exponential decay. The maximum levels of imazapyr found in water and sediment samples after application were 3.4 mu g/ml and 5.4 mu g/g, respectively, which are 5 to 6 orders of magnitude lower than levels needed to affect aquatic invertebrates and fish. Imazapyr in water and sediment samples approached the zero asymptote at 40 and 400 hours respectively, with half-lives of
ISSN:0146-6623