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Need. In 1993 the United States lost more than one million acres (405,000 hectares) of crops to disease. More than 800,000 acres of wheat succumbed to disease, exacting a monetary loss in the millions of dollars.
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Need • In 1993 the United States lost more than one million acres (405,000 hectares) of crops to disease. • More than 800,000 acres of wheat succumbed to disease, exacting a monetary loss in the millions of dollars. • Every year 250-300 million dollars of chemical pesticides are used to control plant infestations.
Purpose Hypothesis