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Herbicide Resistant Hydrilla
Hydrilla was introduced to the waters of Florida in the 1950’s and is today one of the most serious aquatic weed problems in the USA. The aquatic herbicide Fluridone is the only chemical approved by the EPA that provided systemic control of the aquatic plant.

Left unmanaged, this invasive plant can rapidly cover thousands of acres of surface water, displacing native plant communities and causing significant damage to the ecosystems. Hydrilla is controlled in large water bodies with sustained use of the chemical fluridone in lake water for several weeks.

Three bio-types of hydrilla have evolved and have now become herbicide-resistant. Of the 200 Florida lakes tested, most of the lakes contained fluridone-susceptible hydrilla, but many others contained various levels of resistance. The fluridone-resistant hydrilla was found in lakes that had been treated with the aquatic herbicide for several years.

Once a resistant strain of hydrilla has established itself as the dominant population, it produced million s of auxiliary and subterranean turions that can remain dormant for many years, diminishing the prospect of eradicating herbicide-resistant plants. The evolution of resistance to fluridone in Florida may forecast significant and long-lasting ecological and economic problems were hydrilla currently grows and is treated.


Herbicide Resistance to Fluridone - White Paper

 
 


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Curly Leaf Pondweed Harvesting Results - East Okoboji Lakes Improvement Corporation harvested curly leaf pondweed for 3-1/2 weeks resulting in 963,000 pounds of aquatic vegetation removed. 80% of the harvested weeds will be ground up and mixed in a garden compost.


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