DDT, the "wonder insecticide" that had millions of dollars worth of free advertising, is a very good insecticide. But it will not do everything. In too small quantities, it will not do anything. To eager manufacturers of bug sprays with "flagrant" claims, the Department of Agriculture has said sternly: label your products properly and give accurate directions. To the bug-plagued public, the department has offered some advice:
ΒΆ DDT is best as a "residual insecticide." It stays on a treated surface for several weeks or even months, killing most insects which come in...
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