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Daily News Blog

Archive for the 'Pyrethrin' Category


Pyrethroids Ubiquitous in California’s Urban Streams

(Beyond Pesticides, October 17, 2008) A study published in the September 15 issue of Environmental Science & Technology has found pyrethroid contamination in 100 percent of urban streams sampled. Synthetic Pyrethroids are one of the most widely used consumer pesticides, but recently they have been scrutinized for their resultant health and environmental effects. California is currently reevaluating certain pyrethroid-containing pesticides as a result of increasingly conclusive research. Entitled “Statewide Investigation of the Role of Pyrethroid Pesticides in Sediment Toxicity in California’s Urban Waterways,” the research included California’s most urbanized regions, as well as the less developed North Coast and Lake Tahoe areas. Thirty creeks in eight regions were selected from 90 screened sites, and bioassays were conducted at two temperatures, 23 and 15 degrees Celsius. Researchers found 25 samples to be toxic at the higher temperature and all 30 at the lower, which is where pyrethroids are more toxic. “Bifenthrin was the pyrethroid of greatest toxicological concern, occurring in all 30 samples,” wrote the team, and the Los Angeles, Central Valley, and San Diego regions showed the most severe contamination. The sampling included analysis for 8 pyrethroids, 30 organochlorine pesticides, and piperonyl butoxide, which helps to make pyrethroids toxic at […]



Report Documents Poisonings from New Generation Pesticides

(Beyond Pesticides, August 4, 2008) According to a new Center for Public Integrity investigation, Perils of the New Pesticides, pyrethrins and pyrethroids were responsible for more than 26 percent of all major and moderate human incidents involving pesticides in the United States in 2007, up from just 15 percent in 1998 ā€¯ā€¯ a 67 percent increase. This is based on an analysis of adverse reaction reports filed with the Environmental Protection Agency by pesticide manufacturers. As a result of the Centerā€™s investigation, the director of the EPAā€™s Office of Pesticide Programs said the agency would begin a broad study of the human health effects of these chemicals this year. “The alarming rise of pesticide-related incidents attributed to pyrethrin and pyrethroid affiliated products is a serious concern for the millions of households that use them,” said Center Executive Director Bill Buzenberg. “The Center for Public Integrity uncovered this public safety issue through more than a dozen Freedom of Information Act requests and crunching the data. This should be basic public information if the EPA were doing its job.” Data from the American Association of Poison Control Centers reveals a similar trend that supports the EPA data analyzed by the Center. The […]



West Nile Spraying Put on Hold Until Testing Completed

(Beyond Pesticides, July 23, 2008) Aerial spraying for West Nile virus (WNv) over urban areas of Sacramento County, California has been halted for one week, after three days of spraying, in order to determine the success of the treatment. The results from a series of before-and-after mosquito trapping, dead bird testing and testing for infected mosquitoes are expected to take one week to complete before it is determined whether spraying should continue. The Sacramento-Yolo Mosquito and Vector Control District is hoping that previous treatments were successful in reducing infected mosquitoes and that it will not need to do more aerial spraying this season. Assistant manager, Gary Goodman, indicated that the possibility of continued spraying remains uncertain, as new data from dead bird testing, mosquito trap analyses and from human cases become available. To combat WNv, the Sacramento-Yolo district has sprayed the pesticide, Evergreen Crop Protection EC 60-6T (which contains pyrethrins) over selected urban areas. Spraying for mosquitoes over urban areas of the county started in 2005, even though aerial sprayings over agricultural fields and from the ground using trucks or hand crews have occurred for a long time. In 2005 however, WNv began spreading broadly in northern California, and Sacramento […]



Pet Shampoos Containing Insecticides Linked to Autism

(Beyond Pesticides, May 27, 2008) A population-based study looking at how genes and environmental factors interact shows that pet shampoos containing insecticides may trigger autism spectrum disorders (ASD), reports New Scientist. The study findings, presented at the International Meeting for Autism Research, show that mothers of children with an ASD are twice as likely to have used an insecticidal pet shampoo during the prenatal and/or postnatal period when compared to mothers of healthy children. The strongest association was during the second trimester of pregnancy. According to the researchers, pet shampoos often contain pyrethrins and previous animal research has found that pyrethrins are designed to target the central nervous system in insects, rodents and other species and can cause death of neurons and compromise the blood-brain barrier in early life.Examining participants in the Childhood Autism Risks from Genetics and the Environment (CHARGE) study, researchers from the University of California, Davis looked at 333 children with ASD and 198 healthy children between the ages of two and five, and their families. In-depth questionnaires and blood and urine samples were collected. Isaac Pessah, Ph.D., a researcher involved in the study and professor in the Department of Molecular Biosciences, College of Veterinary Medicine at […]