HOME >> BIOLOGY >> NEWS
Mosquito spray increases toxicity of pyrethroids in creek, study finds

Berkeley -- A relatively benign compound contained in a widely used group of insecticides can mix with and increase the toxicity of existing pesticides in the environment, according to a new study led by biologists at the University of California, Berkeley.

While the increase in toxicity was relatively modest, the effects from the interaction of chemicals were unexpected, the researchers said.

The study's results, reported in the July 26 online edition of Environmental Science & Technology, send a message to environmental regulators to reassess how they evaluate a product's toxicity, said Donald Weston, UC Berkeley adjunct professor of integrative biology and lead author of the study. "This interaction of compounds is a whole new issue when doing pesticide risk assessments that has been largely ignored by regulators," said Weston.

The findings came from water and sediment samples collected from six creeks in Sacramento, Calif., after the county's mosquito control authorities took the rare step of applying an insecticide by air in August 2005. UC Berkeley researchers point out that aerial applications can cover far more acreage than ground spraying from trucks, and are used if the human health risk from mosquito-borne infections is perceived to be greater than the risk of exposure to the pesticide.

In this case, the decision to spray by air came after two dozen people in Sacramento County had become infected that summer by the West Nile virus. An 85-square mile region north of the American River was treated on Aug. 8, 9 and 10, and a 104-square mile area south of the American River was treated Aug. 20, 21 and 22.

Sediment and water samples were taken from the northern creeks on Aug. 12, about 34 hours after the third night's application of the pesticide. In the southern creeks, samples were collected on Aug. 14, six days before the first application, and Aug. 22, about 10 hours after the second night's application.


'"/>

Contact: Sarah Yang
scyang@berkeley.edu
510-643-7741
University of California - Berkeley
28-Jul-2006


Page: 1 2 3 4

Related biology news :

1. Revealed -- Mosquito genes that could be controlling the spread of killer viruses
2. Mosquito genes explain response to climate change
3. Mosquito immune system examined
4. Mosquitoes are more attracted to individuals infected with malaria
5. Mosquito study shows new, faster way West Nile can spread
6. Health concerns: Mosquito mapping may help
7. Global study concludes attack rate of flu in kids is 55 percent lower with nasal spray vaccine
8. Harvard team creates spray drying technique for TB vaccine
9. Flu shot effective against drifted influenza, nasal spray vaccine less so
10. ACRUS broadens contraceptive spray strategy
11. Oral saline spray may slash spread of exhaled pathogens

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:7/31/2020)... ... 30, 2020 , ... BioFactura, Inc. today announced a $1 ... Science & Technology Office—Chemical and Biological Defense (JSTO-CBD) of the Department of Defense ... highly efficient mammalian cell culture-based bioprocess suitable to meet surge requirement needs for ...
(Date:7/18/2020)... SAN ANTONIO (PRWEB) , ... July 16, 2020 ... ... PLOS ONE that demonstrates the effectiveness of the Invictus Medical Neoasis™ active noise ... (NICU) environment. The study reported that the Neoasis™ device attenuated the alarm sounds ...
(Date:7/10/2020)... , ... July 09, 2020 , ... Today CJ BIO ... which will share insight on the “fifth taste” phenomenon that is revolutionizing ingredient mixes, ... Umami Advantage will be live on Monday, July 13, 2020 at11:00 AM (CDT) during ...
Breaking Biology News(10 mins):
(Date:8/3/2020)... ... August 03, 2020 , ... Introducing Ardent Animal Health ... growth, , Known as MediVet Biologics since its formation in ... The new Ardent Animal Health will build on its base of innovative therapies ...
(Date:7/31/2020)... ... July 29, 2020 , ... Anomet Products has introduced ... materials for use with CRM, neurostimulation, vascular, and related devices. , Anomet ... design requirements, performance, and cost criteria; especially where solid wire is limited. Typical ...
(Date:7/31/2020)... (PRWEB) , ... July 30, ... ... of cloud-based software for the life sciences industry, today announced the release ... platform designed specifically for Medical Science Liaisons (MSLs) and other field medical ...
(Date:7/18/2020)... ... July 16, 2020 , ... Medial ... early detection and prevention of high-burden diseases, and Centric Consulting, a business and ... organizations to utilize existing data in order to identify and prioritize patients for ...
Breaking Biology Technology:
Cached News: