Many problems that are difficult to solve have been created by the appearance and spread of insecticide-resistant strains of insects. We now know that resistance is inherited, rapidly acquired and slow to be lost, and ways have been indicated in which it may arise; but more must be discovered about the mechanism of action of the toxicants and their metabolism in the insect body before the nature of the trouble can be fully understood.
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J. F. Newman (1957) studied this question.
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