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ONE of the oldest of all agricultural problems is that of locust invasions. References to such plagues are frequent in the texts of the ancient Egyptians, Greeks, Chinese and Hebrews-the oldest dates back to more than 2000 years B. C. These depredations are not confined to a few countries, although outbreaks regularly appear in individual lands only to devastate many distant territories. It cannot be emphasized too strongly that much of the failure to control these plagues has been due to isolationist policy adopted by those countries directly affected.

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