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|Title:||Early season applications of fluridone for control of curlyleaf pondweed|
|Authors:||Poovey, Angela G.|
Glomski, LeeAnn M.
Netherland, Michael D.
Skogerboe, John G.
|Publisher:||Environmental Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||ERDC/EL ; TR-10-22.|
|Abstract:||Widespread in the Great Lakes region, curlyleaf pondweed (Potamogeton crispus L.) is an exotic submersed plant that forms dense monotypic stands, and is reported to restrict recreation, suppress native plant populations, and increase internal phosphorus cycling. Because preventing new turion formation is the key to long-term management of this aquatic weed, the effect of fluridone applications on curlyleaf pondweed growth and vegetative reproduction was evaluated in two greenhouse studies. Herbicide doses ranged from 0.5 to 6 μg ai L-1, and were applied to plants of different growth stages for varying exposure times. Fluridone doses ≥5 μg ai L-1 that were maintained for at least 28 days before degrading to ≤2 μg ai L-1 inhibited both shoot growth and turion production. Treatments of 3 and 4 μg ai L-1 that degraded to ≤2μg ai L -1 after 28 days reduced turion number, but not shoot biomass. All treatments ≤2 μg ai L -1 were comparable to the reference. Although young plants that were <15 cm at herbicide application remained below the water surface, they produced the same amount of turions as mature plants that were >15 cm at the time of application. Sprouting tests determined that turions from all fluridone treatments were viable. Based on these results, strategies for curlyleaf pondweed management may include fluridone applications to young plants using rates that would curtail turion production and either prevent or limit nuisance shoot growth.|
|Appears in Collections:||Technical Report|