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Daily News Blog

Archive for the 'Acetochlor' Category


14
Jun

Agricultural Herbicide Use Threatens Oak Trees

(Beyond Pesticides, June 14, 2017)  Oak trees in Iowa may be the latest victim of widespread chemical-intensive agriculture, according reports in the Des Moines Register. The newspaper indicates that the Iowa Department of Natural Resources (IDNR) has received roughly one thousand calls this spring from residents concerned about the state of their oak trees. Leaves are ‘tattered’ down to the vein, in an appearance one would first think was related to pest damage, according to the newspaper article. However, foresters with IDNR indicate the cause is likely the use of chloroacetanillide herbicides, which are applied throughout the state and region. Advocates say that this situation contributes to mounting environmental problems associated with chemical-intensive food production that support the need for the adoption of non-toxic weed management strategies. Past research has found associations between the use of chloroacetanillide herbicides, such as acetochlor and metolachlor, and oak leaf tatter syndrome. State officials indicate that the increase in resident complaints is likely related to a colder March, which may have retarded leaf development. By the time leaves began unfurling in early spring, herbicide use was at its height, leading to high ambient concentrations of the chemicals in the atmosphere, according to IDNR officials […]

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17
Nov

Study Finds Low Pesticide Concentrations Can Become Toxic Mixture

(Beyond Pesticides, November 17, 2008) A toxic soup of the most commonly used pesticides frequently detected in nature can adversely affect the environment and decimate amphibian populations even if the concentration of the individual chemicals are within limits considered safe, according to University of Pittsburgh research published in the online edition of Oecologia. The results of this study build on a nine-year effort to understand potential links between the global decline in amphibians, routine pesticide use, and the possible threat to humans in the future. Amphibians are considered an environmental indicator species because of their unique sensitivity to pollutants. Their demise from pesticide exposure could foreshadow the fate of less sensitive animals, according to study author Dr. Rick Relyea, Ph.D., an associate professor of biological sciences in the University of Pittsburgh’s School of Arts and Sciences. Leopard frogs, in particular, are vulnerable to contamination; once plentiful across North America, their population has declined in recent years as pollution and deforestation has increased. Dr. Relyea exposed gray tree frog and leopard frog tadpoles to small amounts of the ten pesticides that are widely used throughout the world. Dr. Relyea selected five insecticides: carbaryl, chlorpyrifos, diazinon, endosulfan, and malathion; and five herbicides: […]

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23
Jan

Industry Scientists Persuade State To Implement More Lenient Pesticide Regulation

(Beyond Pesticides, January 23, 2008) Agribusiness giants Dow AgroSciences and Monsanto have successfully persuaded the state of Minnesota to reconsider their water-quality limit for the chemical, acetochlor. Scientists representing the industry presented their own studies to the Minnesota Pollution Control Agency (MPCA) and explained that the state’s original draft limit for acetochlor was too strict. Despite three years of research conducted by the state, scientists from Dow and Monsanto presented officials at the MCPA with six published studies- one of them in Chinese- which they claimed were overlooked by the state when determining the standard for acetochlor in waterways. As a result, the MPCA has decided to allow 3.6 parts per billion of acetochlor in rivers, more than twice the concentration of the 1.7 parts per billion previously proposed. As a result, three of five streams classified as ”˜impaired’ by acetochlor, including a popular trout stream in southeastern Minnesota, can no longer be considered polluted. Some environmental advocacy groups question whether the MPCA gave favorable treatment to the pesticide makers, claiming that other research that suggest that the chemical can cause ecological damage have not been seriously considered. “It looks like there’s a double standard, that industry can come in […]

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