Netherland, M.D., K.D. Getsinger, and E.G. Turner, 1993. Fluridone Concentration and Exposure Time Requirements for Control of Eurasian Watermilfoil and Hydrilla, US Army Corps of Engineers.

Reprinted with permission from Journal of Aquatic Plant Management (1993) 31: 189-194

Fluridone Concentration and Exposure Time Requirements for Control of Eurasian Watermilfoil and Hydrilla

Abstract
Fluridone concentration and exposure time requirements were evaluated for Eurasian watermilfoil (Myriophyllum spicatum L.) and hydrilla (Hydrilla verticillata (L.f.) Royle) under controlled-environment conditions. Results indicated that fluridone effectively inhibited growth and reduced biomass at rates of 12.24 and 48 µg/l. Shoot and root biomass and total chlorophyll were reduced from 70 to 98% following 30-, 60- and 90days exposures to fluridone. However, removal of fluridone at 30 and 60 days resulted in extensive regrowth following a 30day recovery period. One exception was milfoil exposed to 48 µg/l for 60 days which was reduced by approximately 98% with no evidence of regrowth. The 48-µg/l treatment often resulted in greater biomass reduction in both species than the other rates; however, no significant differences were noted between the treatment rates of 12 and 24 µg/l. Results indicate that maintaining fluridone concentrations for >60 days at rates as low as 12 µg/l is critical for successful fluridone treatments.

Entire Paper
Contact: Kurt Getsinger, US Army Corps of Engineers, Waterways Experiment Station, 3909 Halls Ferry Road, Vicksburg, MS 39180-6119
Key Words: Eurasian_watermilfoil, Hydrilla, Aquatic_plant_management
Product Type: Research, Control
User Type: Resource Management