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Show Hew Chemicals Make Plants Insect-Proof Federal Entomologists In Experimental Study New chemicals that make plants toxic to insects for. short period? are being tested by scientists ol the U.S. department of agricul ture. These chemicals kill insects that suck the juices of treated plants. They are known to the en tomologists as "systemic poisons' and should not be used by the pub lie until further tests have beei made. Studies povv are in progress Ir determine if these insecticide1 chemicals will break down int harmless compounds within a few days or weeks. If they do, a new A farmer fills a fertilizer attachment at-tachment in this photo, typical of the teaming up of fertilizer and chemicals that result in the best farm production. approach will be available to American agriculture in the control of some of the most difficult insect pests, according to entomologists of the federal bureau of entomology and plant quarrantine. |