Fate of the Dicamba in the Environment

Soil

Dicamba will persist in the soil for up to 3 months, or longer, in the soil. Breakdown rates in the soil are primarily due to volitalization losses from the soil, and microbial degradation in warm, moist soils. As such it is an effective soil-applied herbicide for weed control after the spring is over. Dicamba is highly mobile in soils and can leach readily in the soil, especially in sandy soils. It can injure plant roots in these lighter soils. Little soil adsorption of dicamba to the soil colloidal fraction occurs. This adsorption is a function of soil pH: adsorption increases with a decrease in soil pH, decreased adsorption with calcareous soils.

Air

One of the problems encountered with the use of dicamba is volatility leading to drift of the herbicide in the air. It is more volatile than 2,4-D and can cause injury in more instances than that herbicide on adjacent susceptible plants. Often dicamba drift can travel farther than 2,4-D also.

Toxicology

Dicamba is excreted by animals with relatively rapid uptake, with little metabolism occuring to the parent molecule.

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