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Linda S. Nelson, John G. Skogerboe, and Kurt D. Getsinger

ABSTRACT

The response of giant salvinia (Salvinia molesta D. S. Mitchell) to 32 herbicide treatments was determined in an outdoor tank study at Lewisville, TX. Treatments included: endothall (as the dipotassium salt), endothall (as the mono(N,N-dimethylalkylamine salt)), diquat, glyphosate, imazapyr, copper, imazapyr + glyphosate, endothall (mono(N,N-dimethylalkylamine salt)) + glyphosate, diquat + copper, diquat + endothall (dipotassium salt), and diquat + endothall (mono(N,N-dimethylalkylamine salt)). Type of surfactant, rate of application and application technique were varied. Treatment with 1.12 kg ha^-1 diquat, 8.97 kg ha^-1 glyphosate, and all of the herbicide combinations controlled > 98% salvinia 42 days after treatment (DAT). Diquat was the most effective herbicide; controlling salvinia regardless of rate, surfactant, application method (submersed vs. foliar application) and whether or not endothall (either formulation) or copper were included in the spray mixture. The least effective product evaluated against salvinia was imazapyr. Results demonstrated that several herbicides available for use in aquatic environments in the U. S. can be used to manage giant salvinia infestations.

For more information:

Nelson, Linda S.
USAERDC Vicksburg
CEERD-EP-P
3909 Halls Ferry Road
Vicksburg, MS 39180-6199
Email: nelsonl@wes.army.mil