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Case Study

Dispersion and Dissipation of 2,4-D

Water hyacinths and Eurasian water milfoil are two invasive species threatening US waterways and aquatic biodiversity. By using agrochemicals, these invasive species can be controlled in an aquatic environment. To better understand the fate of agrochemicals used for detrimental foreign species, a controlled aquatic dissipation and dispersion study was conducted by Waterborne on behalf of the Industry Task Force II on 2,4-D Research Data.

Our Findings

In this study, 2,4-D was applied to Eurasian water milfoil in a lake in Minnesota and to water hyacinths in both lake and river environments in Florida. The Minnesota study required direct injection below the water surface at the rate of 10.8 lbs a.e./acre. The Florida studies required foliar treatment over the surface at a rate of 3.8 lbs a.e./acre. The Task Force also conducted an onsite microcosm study upstream from the St. Johns River study site in Florida. Results of these studies showed rapid dissipation of 2,4-D within and outside the treated areas to levels below the drinking water standard within a short period of time.

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