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Giant Salvinia - Salvinia molesta

Salvinia molesta
New Giant Salvinia (Salvinia molesta) Discovery
at Lake Conroe, Montgomery Co., Texas

Photos and Observations by Kelly Duffie
Estes Inc., Houston, Texas
May 2000

(Click on images for larger view)

Lake Conroe image 1 - click to enlarge
Looking east from the feeder creek in which the infestation is suspected to have originated.

Lake Conroe image 2 - click to enlarge
San Jacinto River Authority has since erected a full-width mesh barrier across the upstream side of the bridge to help inhibit further introduction into the main portion of the reservoir.

Lake Conroe image 3 - click to enlarge
Wide-angle view towards Lake Conroe finds giant salvinia aggregating with water-hyacinth to form midstream and shoreline mats.

Water hyacinth - click to enlarge
Giant salvinia intermingled with water-hyacinth, a common occurrence that presents a greater treatment challenge.

Water hyacinth - click to enlarge
Giant salvinia surviving herbicide treatment that destroyed water-hyacinth.

Image collage - click to enlarge
Small propagules of giant salvinia persisting under a mulch of dead water-hyacinth. The water-hyacinth died as the water level receded over the past few months, remaining debris provides protection to the underlying salvinia.

 

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U.S. Department of the Interior | U.S. Geological Survey
URL: http://salvinia.er.usgs.gov/
Page Contact Information: Buck Albert - Web Administrator
 Page Last Modified: April 27 2005

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