Volume 13, Issue 23 ~ June 9 - 15, 2005

 
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Got an Environmental Question? Send it to: EARTH TALK, c/o E/The Environmental Magazine, P.O. Box 5098, Westport, CT 06881. Or submit your question at: www.emagazine.com. Or e-mail us at: earthtalk@emagazine.com.
From the Editors of E/The Environmental Magazine

What are the health and environmental consequences of some of the methods used to control mosquitoes, ticks and other insects?

By far the most popular form of insect repellent available to consumers in the U.S. is diethyl-meta-toluamide, known popularly as DEET. Each year approximately one-third of the U.S. population uses insect repellents containing DEET, according to the U.S. Environmental Protection Agency. DEET is the active ingredient in more than 230 products, including sprays, lotions, liquids and wristbands.

But recent laboratory animal studies have found that frequent and prolonged exposure to DEET can cause neurons to die in regions of the brain that control muscle movement, learning, memory and concentration. Other studies using humans have found adverse effects ranging from skin irritation and blisters to memory loss, even seizures. Very high exposures, such as those that occur if the repellent is swallowed, have caused neurological damage in at least 18 children, three of whom died as a result. Despite these threats, the EPA insists that DEET products are safe — as long as consumers follow the directions carefully.

Meanwhile, bug zappers — which emit ultraviolet light to draw pests — kill few if any mosquitoes, which are attracted not to light but to our body heat and the carbon dioxide we exhale. Some four million zappers are at work in the U.S., toasting each month nearly 71 billion insects — mostly non-target bugs. The most common bugs killed are beetles, moths, flies, bees, ants and wasps, many that are themselves beneficial for insect control as well as pollination.

There are issues with many localized forms of pest control, but most troublesome are the potential public health effects of the widespread application of organophosphate pesticides, such as Malathion, intended to wipe out large mosquito populations for miles around. In recent years, cities and states looking to stave off mosquito-borne maladies like West Nile Virus have undertaken large-scale mosquito control projects, often involving the use of Malathion. Malathion is chemically related to the nerve gases used in World War II, according to Pesticide Action Network. It kills by disrupting nervous system processes, and has been linked to cancer, nervous system disorders and a wide range of other maladies in humans.

One environmentally friendly alternative mosquito control method is Bacillus thuringiensis israelensis, a bacterium that can be applied to mosquito breeding grounds, usually in places where standing water collects. BTI is a naturally occurring organism that targets only the larvae of insects and as a result poses no health threat to humans or wildlife. Some hardware stores stock BTI-infused mosquito dunks that are activated when wet. Another somewhat more costly option is the Mosquito Magnet, a trap that attracts mosquitoes by emitting an irresistible combination of carbon dioxide, heat and moisture.

Perhaps the safest way to avoid bug bites is to don the always-dapper combination of a long-sleeved shirt, long pants, ankle socks and a wide-brimmed hat.
 
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