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In 1939, the Swiss chemist Paul Mueller mÃ¼ller discovered that this chemical was a potent. PESTICIDE ddt was first used During World WAR, ii as a delousing. Agent later, on areas in Southern, Europe North, africa And asia were fogged WITH, ddt to clear-malaria laden mosquitoes from the paths of Invading allied. troopsDT was first used during World War II, as a delousing agent. Later on, areas in southern Europe, North Africa, and Asia were fogged with DDT, to clear malaria-laden mosquitoes from the paths of invading Allied troops.
As with many inventions, development of the first fungicide was the result of good observations. The first use of brining of grain with salt water followed by liming took place in the middle of the 17th century to control bunt, and followed the observation that seed wheat salvaged from the sea was free of bunt.