05
Oct
Oregon Temporarily Bans Herbicide Known to Kill Trees… after the Herbicide Is Found to Kill Trees
(Beyond Pesticides, October 5, 2018) The Oregon Department of Agriculture (ODA) is temporarily banning the use of any products containing the herbicide aminocyclopyrachlor to rights-of-way after finding widespread tree deaths along a scenic highway that cuts across the center of the state. While Oregon is the first state to ban the chemical, it is not the first instance of the pesticide killing stands of established, otherwise healthy trees. In 2014, chemical company DuPont settled a class action lawsuit totaling over $1.8 million in civil penalties after its aminocyclopyrachlor product Imprelis was cited for misbranding and failure to report adverse incidents of trees dying after applications.
Oregon first encountered evidence of abnormal growths, curling, and die-backs of coniferous trees along roadsides back in 2012. A report on tree damage produced by ODA in 2015 narrowed the cause down to the use of aminocyclopyrachlor-based herbicides, including DuPont’s Imprelis, as well as Bayer’s Perspective. At the time, ODA indicated the U.S. Forest Service (USFS) had sent letters to the agency requesting the cessation of aminocyclopyrachlor use along roadsides. Oregon officials indicate that the contractor did stop spraying the chemical in areas cited in the report.
An update to the first report, published in September 2018, found that die-off and damage increased alongside the highway where trees were sprayed. The elevated damage outlined by the updated report led to ODA’s temporary ban, which will be in effect until late March, 2019. The USFS also announced plans to log a section of the highway impacted by the tree die-off. “It’s a public safety issue . . .you just never know when a tree is going to go,†said Forest Service spokeswoman Kassidy Kern to Oregon Public Broadcasting. The move will log trees that are in some cases hundreds of years old.
This ecological tragedy and threat to public safety would have been easy to avoid if U.S. Environmental Protection Agency (EPA) and ODA had taken a more precautionary approach to regulating this new chemical. Aminocyclopyrachlor was given a conditional registration by EPA in 2009. At the time, DuPont was the primary registrant for the pesticide, and commercialized the product Imprelis for consumer use. However, soon after hitting the market, landscapers and golf courses began reporting the death of trees as a result of runoff or drift from the application of Imprelis to turfgrass areas. Reports initially indicated the deaths of millions of dollars worth of Norway spruce and white pine were mysterious, however it quickly became apparent that Imprelis was at fault. This led EPA to issue a stop use order to DuPont in 2011.
EPA cited the company for misbranding on the product’s label, as Imprelis did not include Norway spruce or white pine as a target species. The agency also later cited the company for not reporting documented adverse incidents. These regulatory actions culminated in DuPont voluntarily withdrawing Imprelis from the market, and paying the aforementioned civil fine of over $1.8 million in 2014.
However, although the product Imprelis was removed from the market, its active ingredient aminocyclopyrachlor remained. DuPont’s herbicide division was purchased by Bayer, which became the primary registrant for the herbicide, and produced the product Perspective. The only substantive change, made after the millions of dollars of damage, is that EPA did not approve Perspective for use on commercial turfgrass sites, such as lawns and golf courses. But the agency left in place allowed uses on “industrial†turfgrass sites, which include right-of-ways, highways, airports, railroads, as well as allowed uses on wildlife management areas. The chemical itself is still conditionally registered, however EPA has received outstanding data it required, and is now in the process of evaluating its acceptability for full registration. There is no indication from the agency that it will further restrict roadside uses.
Oregon Public Broadcasting indicates that the herbicide was sprayed by a contractor alongside Oregon highways for four years up until 2015, the year the ODA report was released. However, it was widely known as early as the second year of the spraying that this chemical caused significant damage to non-target trees. As a result, many are questioning why ODA took so long to issue its temporary ban on the chemical.
Aminocyclopyrachlor is a picolinic class chemical, which is similar to herbicides such as aminopyralid, clopyralid, and picloram. These chemicals are selective, targeting weeds but not affecting grass species. However, when, for instance, cows or horses feed on hay or other grasses sprayed with these chemicals, they can pass through these animals and end up in their manure. When composted, manure containing even minute levels of these chemicals, as low as 1 to 10 parts per billion, can result in damage to vegetables and other sensitive crops grown in the contaminated media. The U.S. composting council lists this class of chemicals as persistent herbicides, and has called on manufacturers to withdraw their registrations, and EPA and state agencies to take decisive action to stop economic and environmental damage caused by these chemicals.
Right-of-way management does not have to involve the regular use of persistent herbicides that could harm non-target species. Mechanical trimmers, biological controls such as goats, and the establishment of low-maintenance native vegetation provide non-toxic alternatives to pesticide use. More information about roadside weed management can be found on Beyond Pesticides’ article, The Right Way to Vegetation Management.
All unattributed positions and opinions in this piece are those of Beyond Pesticides.
Source: Oregon Public Broadcasting, ODA









(Beyond Pesticides, October 4, 2018) According to new research from the University of Texas at Austin, glyphosate, the world’s most widely used agrichemical weed killer, may also be killing bees by impairing their gut microbiota, and subsequently, their immune systems. The study, published in the journal Proceedings of the National Academy of Sciences, titled
(Beyond Pesticides, October 3, 2018) REMINDER: The Fall 2018 NOSB public comments are due by Thursday, October 4, 2018. Your comments and participation are critical to the integrity of the organic label. Written comments may be submitted throughÂ
(Beyond Pesticides, October 2, 2018) The U.S. Environmental Protection Agency (EPA) is asking an appeals court to rehear a case that previously ruled EPA must immediately ban the brain-harming pesticide
(Beyond Pesticides, October 1, 2018)Â Last year, pesticide manufacturers tried to undo local pesticide ordinances in a large state-by-state lobbying effort. That failed. Now they are trying to get Congress to undo these local rules in one fell swoop through an amendment in the Farm Bill.
(Beyond Pesticides, September 28, 2018) Despite French President, Emmanuel Macron’s pledge to see glyphosate banned in his country, French ministers of parliament (MPs) have once again refused to enter the banning of glyphosate into legislation. Glyphosate’s use in Europe has come under scrutiny and heated debate. But despite evidence of harms, and interference by Monsanto, the European Union (EU) extended its license last year. However, France has pledged to ban the chemical within a few years.
(Beyond Pesticides, September 27, 2018) The U.S. Environmental Protection Agency’s (EPA) Office of the Inspector General (OIG) released a 
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Beyond Pesticides, September 24, 2018) In a move that critics fear may be a pretext for gutting federal agricultural research, U.S. Secretary of Agriculture Sonny Perdue has proposed overhauling two federal offices overseeing food and agriculture research and moving them out of the Washington, DC area. A plan announced in August to relocate one of the U.S. Department of Agriculture’s (USDA) top research office — the Economic Research Service — into the Office of the Secretary, a political branch of the U.S. Department of Agriculture, is raising alarm from scientists. Concerned researchers see the move as a way to cut funding to important projects on climate change and nutrition, among others, consistent with
(Beyond Pesticides, September 20, 2018) Babies exposed to higher levels of organochlorine compounds in the womb go on to have worse lung function in childhood, according to new research presented at the European Respiratory Society International Congress. Previous studies have found a link between low lung function in early adulthood and respiratory, cardiovascular, and metabolic issues in later life. Beyond Pesticides has covered in its Daily News studies on a range of adverse effects, including
(Beyond Pesticides, September 19, 2018) “‘Don’t get pregnant at George Air Force Base’†was the
(Beyond Pesticides, September 18, 2018) While climate change campaigners have long warned of increased pest pressure as a result of a warming planet, new research published in Science has begun to envisage the true extent of this expanding crisis for agriculture and crop yields. An Earth warmed by 2 degrees Celsius will see significant increases in insect metabolism and population growth, increasing global food scarcity. The study underlines the need to move towards more sustainable agricultural models that can better handle pests and other stressors brought about by climate change.
(Beyond Pesticides, September 14, 2018) A lawsuit
(Beyond Pesticides, September 12, 2018) The city of Amsterdam, Netherlands is leading global bee recovery efforts by increasing its diversity of wild pollinator species, according to
(Beyond Pesticides, September 11, 2018) A report released this summer by the nonprofit group The Cornucopia Institute helps consumers avoid ‘factory farmed’ dairy products in light of disturbing revelations uncovered in a
(Beyond Pesticides, September 10 2019)Â Does your community spray toxic pesticides for mosquitoes? In a well-intentioned but ill-informed attempt to prevent mosquito-borne illness such as West Nile virus, many communities spray insecticides (adulticides) designed to kill flying mosquitoes. If your community is one of these, then your public officials need to know that there is a better, more-effective, way to prevent mosquito breeding.
(Beyond Pesticides, September 6, 2018) Red swamp crayfish have long been associated with Louisiana and Gulf Coast bayous, but the species has found new homes throughout the world over the last 70 years, and evidence is showing that their introduction may alter ecosystems in ways that increase mosquito populations and human disease risk. Â In late August, researchers at the University of California, Los Angeles and Pepperdine University published new evidence in the 

