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Chemistry of the Pesticides

Man against Insects and Diseases. Insects have been one of man’s more serious problems since prehistoric times. The cave dweller was undoubtedly subject to the attacks of lice, fleas, ticks, and other parasitic pests which existed at that early time in practically the same form as they do today. The annoyances of these pests were minor, however, and probably were not considered seriously by the prehistoric householder.

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Donald E . H . Frear

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Pūccikkollikaḷiṉ vētiyiyal




D . Van Nostrand Company Inc

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The advancing centuries brought about gradual but fundamental changes in man’s mode of living. From a predatory animal he became a cultivator of crops; later he banded together with his fellows to form small communities and villages. As his mode of life changed, man’s relationships toward insects and diseases assumed a more important place in his life. His first cultivated plants were native species which supplied him with food, clothing, or some other daily need. Cultivation at first consisted of clearing away the competitive vegetation and freeing the chosen plants from the natural competition to which they had previously been subjected. When such encouragement was given the selected plants, other difficulties appeared. The plants, now grown larger and probably more fruitful than in their original environment, became more at- tractive to man, and to insects and diseases as well. This occurred not only because of the increased size and vigor of the plant, but mainly because the natural vegetation, which had formerly grown in close proximity to the cultivated plants, was now removed.


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