R.I.
Roads Sprayed Annually with Herbicides
By TIM FAULKNER/ecoRI.org News staff
Whether or not you like it, exposure to herbicides is
unavoidable if you drive in Rhode
Island .
Using truck-mounted hand-sprayers, all 1,100 miles of Rhode Island 's state
roads, highways and bridges are treated with herbicides twice a year by the
state Department of Transportation.
This year, the herbicide dicamba, under the commercial
name Vanquish, has already been sprayed on roadsides.
This "pre-emergent" herbicide was applied to road shoulders and curbs in late April and early May to stop the growth of weeds, brush and bamboo.
This "pre-emergent" herbicide was applied to road shoulders and curbs in late April and early May to stop the growth of weeds, brush and bamboo.
Glyphosate is sprayed in July to eliminate existing weeds
and unwanted plant growth. Both are registered with state Department of
Environmental Management (DEM) and legal to use.
In studies, dicamba has shown to cause liver, adrenal gland and reproductive problems in pets and other animals. It is slightly toxic to fish and other aquatic wildlife. It has a half-life of one to four weeks. Although its long-term effects are uncertain, dicamba is highly prone to leaching through soil and into groundwater. Dicamba is not classified as a human carcinogen.
The herbicide Razor, aka glyphosate, is the most common
herbicide in the United
States and was popularized as the main
ingredient in Monsanto's herbicide Roundup. Glyphosate health risks are
considered greater than dicamba.
Glyphosate has shown fetal abnormalities in rats, as well as estrogen and testosterone problems in human embryonic cell studies. It is a suspected endocrin disruptor. It is not considered a carcinogen.
Glyphosate has shown fetal abnormalities in rats, as well as estrogen and testosterone problems in human embryonic cell studies. It is a suspected endocrin disruptor. It is not considered a carcinogen.
The European Union classifies glyphosate as dangerous for
the environment and toxic for aquatic organisms. The Environmental Protection
Agency (EPA) says prolonged exposure to glyphosates in drinking water can lead
to kidney and reproductive "difficulties." It has proved toxic
to crustateans and amphibians.
Weeding and mowing are alternatives to control weeds and
brush. But Vanquish and Razor are inexpensive alternatives. Vanquish costs $160
for a gallon of concentrate. No more than three gallons of concentrates are
needed to apply to the entire state.
Razor is even less expensive at $56 for a gallon of
concentrate. Only two or three gallons are needed to create the mixture to
treat all state roads.
Public herbicide use also occurs at state parks, the
Statehouse grounds and other state-owned lands. Each Rhode Island city and town also relies on
pesticides and herbicides to eliminate unwanted bugs and plants from public
grounds.