Biological Insect Control

Organic alternatives for insect control in the garden.

| July/August 1984

  • 088-173-01i1
    Garden-beneficial nematodes can provide effective control of Japanese beetles.

  • 088-173-01i1

As waves of summer heat make the soil shimmer and drenching downpours release the fragrance of the earth, it's the season to pick bugs, pull weeds, cultivate the soil ... and look forward to the joys of the harvest.  

There's a cornucopia of good news for home gardeners this month, and much of it concerns organic alternatives for disease and insect control. Take the catalog of Ringer Research, for example. In it you'll find such well-known products as Bacillus thuringiensis (BT or Dipel), a bacterial insecticide that's effective against caterpillars, and milky spore, a disease that colonizes and controls Japanese beetles.

But you'll find some less common items, too. A version of BT called BMC—more scientifically, Bacillus thuringiensis israeliensis—is offered as a safe, natural control for the larvae of black flies and mosquitoes, two pests that can really keep you out of the garden! The best thing about this special form of BT is that it has no effect on people, fish, or other creatures: It just kills larvae. (BMC is also available from Gurney's Seed & Nursery Co.)

And then there's Seek, which provides effective control of root weevils, cutworms, Japanese beetles, some borers, and other insect pests. Operating much like BT, Seek (actually living Steinernematid nematodes) lies in wait in the soil for its enemies. Once contact is made, the garden-beneficial nematodes enter their victim and effect a kill in two days. In the process, the nematodes multiply and send out additional generations for long-lasting control. Half a pound treats 200 square feet and sells for about $13.

Garden Disease Control

Now that's really good news, you might say. What could be better? Well, try this: According to a report by Jerry Bishop in The Wall Street Journal, a team of scientists working on interferon research has identified a chemical that—at least in laboratory tests—has proven to be a potent inhibitor of plant viruses. Bishop says, "If field experiments confirm laboratory experience, the chemical could be to plant virus diseases what penicillin is to human bacterial diseases."

Stop for a moment and cast your mind over some of the virus diseases that beset plants: tobacco mosaic (TMV) on such members of the nightshade family as tomatoes ... bean mosaic on legumes ... and anthracnose on virtually everything. In all, there are about 400 known viruses that affect plants, and the damage they do to commercial crops has been estimated at between 2 and 10% of the total yield. Anything that can begin to control such viruses will clearly be a boon to commercial agriculture ... and also to the home gardener. just think how often you've had to plant a disease-resistant hybrid in place of a more flavorful (but also more vulnerable) standard variety!

Jerry Bishop summed up the benefits of the new-synthesized compound called 2,5-A that is—in its natural form—produced when interferon comes in contact with animal cells: "Minute amounts of the chemical sprayed on a plant can stop a devastating virus infection in less than an hour. The chemical can be made fairly cheaply in large volume. More important, it is harmless to the plant ... and to humans and other animals."

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