Silent Spring by Rachel Carson

grazing. The whole operation had cos t less than a penny per acre. In contras t, the
unsatisfactory attempts at chemical control in earlier years had cost about £10 per acre.
Both of thes e examples s ugges t that extremely effective control of many kinds of unwa nted
vegetation might be achieved by paying more attention to the role of plant-eating insects. The
science of range management has largely ignored this possibility, although thes e ins ects are
perhaps the mos t s elective of all grazers and their highly res tricted diets could easily be turned

to man’s advantage.