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Hydrilla and Giant Salvinia Survey in Mississippi for 2009

Cox, M. C., Madsen, J. D., & Wersal, R. M. (2010). Hydrilla and Giant Salvinia Survey in Mississippi for 2009. Aquatic Plant Management Society 50th Annual Meeting. Bonita Springs, FL.


Nuisance aquatic plants pose major threats to our state waterways and river systems. Two species of concern in Mississippi are hydrilla (Hydrilla verticillata (L.F.) Royle) and giant salvinia (Salvinia molesta Mitchell). Hydrilla is a submersed macrophyte native to Asia but now thriving in the southeastern United States and some northern and western states. Giant salvinia is a free-floating aquatic fern native to southeastern Brazil that is also becoming widespread throughout the southern United States. Both of these aquatic plants are on the Federal Noxious Weed List and the State Noxious Weed List for Mississippi. Mississippi State University and the Mississippi Bureau of Plant Industry developed a memorandum of agreement in 2005 as part of USDA APHIS Cooperative Agricultural Pest Survey (CAPS) program for the state of Mississippi. This agreement is to survey water bodies in the state of Mississippi for the presence of hydrilla or giant salvinia. In the last five years, hydrilla has been observed in the Noxubee National Wildlife Refuge near Brooksville, MS, in the Ross Barnett Reservoir near Rankin County, in the Tennessee-Tombigbee Waterway near Monroe and Itawamba counties, in fairway ponds on Fallen Oak Golf Course near Harrison County, and in Wall Doxey Lake near Marshall County. Giant salvinia has been observed in the Pascagoula River near Jackson County and in Wedgeworth Creek near Forrest County. Successful treatments of these species have detained present populations in some areas of the state but not eradicated them. This survey is representative of the Early Detection and Rapid Response Program for invasive plants in Mississippi.

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