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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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Scientists Develop a Model to Map Invasive Species - There has been a well-documented boom in global shipping over the past 20 years and this has led to growing numbers of aquatic invasive species moving via ballast tanks, or by clinging to hulls.

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