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Wednesday, July 23, 2008 02:20 pm

Green-friendly pesticides

Here’s how to avoid chemicals that poison people, pets, and wildlife

Synthetic lawn and garden chemicals can poison people and pets alike. American homeowners apply some 100 million pounds of the stuff each year but are fast discovering the benefits of using more natural and less toxic approaches.

What green-friendly lawn and garden pesticides are available today?

Pesticides have greatly boosted agricultural yields over the last half century, so it is no wonder, given the commercial availability of many of these synthetic chemicals, that American homeowners apply 100 million pounds of the stuff each year to make their own gardens grow bigger and faster, too.

But the downside of using such chemicals is that they can poison people and pets as well as backyard wildlife: "Common insecticide ingredients such as 2,4-dichlorophenoxyacetic acid (2,4-D), atrazine, and dicamba have been shown to harm mouse embryos at times equivalent to the first week after conception in humans," says Erica Glasener of The Green Guide. In light of such revelations, home gardeners are fast discovering the benefits of avoiding chemicals in favor of natural, less toxic alternatives.

Before thinking about applying pesticides, gardeners can design (or redesign) their gardens to make the most of native plants that have evolved over eons to thrive in local conditions without synthetic aid or lots of water. Choosing native plants appropriate to your elevation, soil type, drainage, and sun exposure will naturally repel many common pests and also reduce the propagation of invasive exotic species.

Similarly, embedding your plants in healthy soil replete with beneficial insects and worms can also help reduce the need for pesticides. Laura Moran of Mainstreet.com suggests that home gardeners compost their vegetable food waste, which is chockfull of nutrients that plants love, and mix it into existing soil to give the garden a healthy boost. "Aside from stimulating healthy root development," she writes, "the addition of rich compost also improves soil texture, aeration, and water retention." It also provides a nice home, she says, for the beneficial bugs that are destroyed along with the bad ones by chemical pesticides.

If pesticides are necessary, there are a handful of organic varieties available. Bacillus thuringiensis ("Bt") is a naturally occurring bacterium that is lethal to most leaf-eating caterpillars on trees, shrubs, flowers, and vegetables. According to gardening writer Jeff Ball, it is harmless to all other insects, animals, and human beings. It comes in a powder form for use as a dust or, when diluted with water, as a spray. Organic chemists have formulated varieties of Bt to kill mosquitoes or potato beetles as well.

To control slugs in an environmentally friendly manner, The Green Guide's Glasener suggests recycling the black cell packs that vegetables and annuals are sold in by placing them (empty) upside down near the bases of plants. "Each morning, check the containers for pests, and if you find any, simply throw the container away with the pests inside," she says. You can use hollowed-out grapefruit rinds in a similar manner around the bases of plants, disposing of them if they turn up any slugs.

Pet owners may already be familiar with insecticidal soaps used to control fleas. Some of these soaps can also be used in the garden to repel insects. For more information, consult a local nursery specializing in organic methods and native plants. Using the free online Native Plants Nursery Directory, find one near you.

For more information: The Green Guide, www.thegreenguide.com; MainStreet.com, www.mainstreet.com; Native Plants Nursery Directory, www.plantnative.org/national_nursery_dir_main.htm.

Send questions to Earth Talk, care of E/The Environmental Magazine, P.O. Box 5098, Westport, CT 06881 or e-mail earthtalk@emagazine.com.


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