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- Title
Evaluation of perennial pepperweed ( Lepidium latifolium) management in a seasonal wetland in the San Francisco Estuary prior to restoration of tidal hydrology.
- Authors
Whitcraft, Christine; Grewell, Brenda
- Abstract
Herbicide applications have shown potential for control and management of invasive perennial pepperweed ( Lepidium latifolium) in rangelands and tidal wetlands. However, reported efficacy of management methods varies widely, and the effects of more recently registered aquatic herbicides on non-target vegetation in riparian corridors and seasonal wetlands are poorly understood. In a replicated field experiment, we applied two registered aquatic herbicides to control L. latifolium upstream of a sensitive tidal wetland reserve as a preliminary step towards hydrologic restoration of a degraded ephemeral creek channel and associated seasonal wetlands. Herbicide treatments (imazapyr, 2,4- d) were applied at flower bud stage in May 2007 and monitored at 1 and 2 years following application. Two years of 2,4- d application were not effective in controlling L. latifolium (<1% control) but had minimal non-target impacts on the native plant community. Imazapyr reduced L. latifolium cover by more than 90% after 1 year of treatment as compared to untreated controls although non-target impacts on the native plant community were severe and persistent over the 2 years of observation. These results provide important information about the response of L. latifolium to management trials in a seasonal wetland and will be used to develop an integrated and adaptive management strategy for weed control as a component of a proposed tidal marsh restoration plan.
- Subjects
SAN Francisco (Calif.); CALIFORNIA; LEPIDIUM; WETLAND ecology; HYDROLOGY; TIDES; WATERSHED restoration; AQUATIC herbicides; ADAPTIVE natural resource management; INFORMATION technology
- Publication
Wetlands Ecology & Management, 2012, Vol 20, Issue 1, p35
- ISSN
0923-4861
- Publication type
Article
- DOI
10.1007/s11273-011-9239-x