Daily News Archive
Up for West Nile
While the district is employing least-toxic methods such as mosquito larva-eating fish and larvacides, it has also fogged Mira Loma and Norco with adulticides, according to Dever. He stated that aerial treatments on this scale have not been done in five or six years. "Right now, we're willing to take pretty much any expense that we have to, in order to protect human health," he said. However, most people's immune systems are able to fight the virus. Only a small percentage of the population will get the virus, and "less than one percent of those infected with West Nile virus will develop severe illness," according to the Centers of Disease Control and Prevention (CDC). In the United States, people older than 50 years and those with weakened immune systems have the highest risk of severe encephalitis. Interestingly, this is the same population most at risk to pesticide poisoning.
Adulticiding programs spray pesticides indiscriminately and do not get at the mosquitoes until they have matured and are already nibbling at your skin. They also do little to restrict breeding. Mosquitoes develop resistance to chemical pesticides over time, which render the chemicals ineffective. Adulticides present considerable risk to all living things, and kill beneficial insects and natural mosquito predators, such as dragonflies, damselflies, and beetles. According to David Pimentel, Ph.D., an entomologist from Cornell University, close to 99.9 percent of the sprayed chemicals go off into the environment where they can have detrimental effects on public health ecosystems, leaving 0.10 percent to actually hit the target pest. ("Amounts of Pesticides Reaching Target Pests: Environmental Impacts and Ethics." Journal of Agricultural and Environmental Ethics Vol. 8, No. 1 (1995), pgs. 17-29).
Use of larvacides in Southern California is a step toward reducing mosquito populations without widespread spray of adulticides. Public education and monitoring of populations are two other important aspects of community mosquito management. One example of a progressive mosquito management policy is seen in Lynhurst, Ohio, which was covered in the July 14, 2003 edition of Daily News.
For more information, see Beyond Pesticides' West Nile Virus/Mosquito Management Program Page.