Invasive Weeds in Georgia

Evans, C.W., C.T. Bargeron, D.J. Moorhead & G.K. Douce. 2005. The Bugwood Network, The University of Georgia.

Giant salvinia

Salvinia molesta D. S. Mitchell

Giant salvinia is an aquatic fern with floating leaves. The 1/2 to 1 1/2 inch long, oblong leaves vary in color from green to gold to brown. The surface of the leaves have rows of arching hairs that look like little egg-beaters. Giant salvinia forms chains of leaves that run together to form thick mats.

Giant salvinia is native to South America and was first introduced into America as an ornamental aquatic plant. It currently occurs across the warmer parts of the southern United States. It is sparse within Georgia but has the potential to infest large areas of the state.

Giant salvinia invades almost any type of water system, from lakes and ponds to rivers, streams, and even rice fields. It forms dense thick mats on the surface of the water which restrict oxygen and light availability, causing death of the primary producers and disrupting the aquatic food chain. It also interferes with recreation, hydroelectric operations, drinking water supplies, and aquaculture facilities.

Giant salvinia is a federal noxious weed; any occurrence should be promptly reported.

Control:
A variety of controls measures, such as biological, chemical, and mechanical have been attempted with varying success.

Recommended herbicides for control:
diquat or Sonar

Photo by Scott Robinson, Georgia DNR