Nelson, L.S., 1997. Response of Hydrilla and American Pondweed to Flurprimidol, US Army Corps of Engineers.

Reprinted from Journal of Aquatic Plant Management (1997) 35 (1997) 35(2): 50-54

Response of Hydrilla and American Pondweed to Flurprimidol

ABSTRACT
An outdoor mesocosm system was used to evaluate the growth regulator flurprimidol ([a-(1-methplethyl)-a-[4-(trifluoromethoxy)phenyl]-5-pyrimidine-methanol]) as a potential management tool on hydrilla (Hydrilla veticillcttn (L. f.) Royle) and American pondweed (Potamogeton nodosus Royle). Treatments included single doses of flurprimidol at 100 and 200 µg/L, a split application of 100 µg/L, and untreated controls. Increasing contact time by applying a split treatment of flurprimidol was more effective for suppressing plant growth than applying flurprimidol as a single dose. The split application reduced shoot length and biomass by 69 and 50%, respectively, for hydrilla, and 34 and 86%, respectively, for American pondweed, at 12 weeks after treatment (WAT). Flurprimidol-inhibited American pondweed shoots had 84% lower total nonstructural carbohydrates (TNC) than untreated plants at 6 WAT, whereas hydrilla had 80% less shoot TNC at 12 WAT. This information will be use ful for assessing the susceptibility of target and nontarget aquatic plants to flurprimidol.

Entire Paper
Contact: Linda Nelson, US Army Corps of Engineers, Waterways Experiment Station, CEWES-ES-P, 3909 Halls Ferry Road, Vicksburg, MS 39180
Keywords: Hydrilla, Chemical_control, Aquatic_plant_management
Product Type: Research, Control
User Type: Resource Management