This discussion on weed ecology emphasizes that the weed flora of a region may undergo striking changes over long periods. Nevertheless weed populations possess important properties of stability which make it unlikely that the use of herbicides will lead to major weed problems from previously minor, but herbicide-resistant, weeds. Susceptible species may develop resistant strains, and action must be taken to meet this danger.
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John L. Harper (1957) studied this question.
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