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Science Helps
Insects Kill Selves
Scientists are taking a new approach to insect problems, says J. M. Amos, Virginia Tech entomologist. Amos says methods are being devised which enable the insects to exterminate themselves. One way is to induce sterility in males and females in natural populations. This has been done by irradiating and releasing the male screw-worm fly in the southeastern states and fruit flies in the Pacific. The insects mate with naturally produced females which lay eggs that do not hatch.
The screwworm has been eradicated in this manner on a Caribbean island, and the release of males in the southeastern states is no longer necessary because no new infestations have been reported The infestation is now being pushed back into Mexico. This method of control has also been successful on Pacific islands where fruit flies have been exterminated. Scientists also are investigating ways to contaminate or
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