. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. Figure 9. Percent increase in acres of soybeans in Illinois counties, 1964 to 1987. Source: Depart- ment of Commerce, Bureau of the Census. ingredienls in herbicides and insecticides have changed over time. Insecticides that are widely used today tend to be acutely toxic to nontarget invertebrates and vertebrates for a few days, with toxicity declining sharply thereafter. This limited time wind
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. Figure 9. Percent increase in acres of soybeans in Illinois counties, 1964 to 1987. Source: Depart- ment of Commerce, Bureau of the Census. ingredienls in herbicides and insecticides have changed over time. Insecticides that are widely used today tend to be acutely toxic to nontarget invertebrates and vertebrates for a few days, with toxicity declining sharply thereafter. This limited time window for acute toxicity is a major improvement compared to insecti- cides such as DDT and other chlorinated hydrocarbons that were once widely used. Compounds such as DDT, and their metabolites, persisted for decades; they pervaded the ecosystems of Illinois and were magnified in natural food chains. The demise of populations of top predators such as the bald eagle was directly related to such chemical compounds used extensively in agriculture. Because field corn has several serious weeds and insect pests (, corn rootworm) and because corn occupies so much of Illinois cropland, it receives the greatest amount of pesticides compared to other crops. How- ever, on a per acre basis, fruit and vegetable crops typically are treated with much greater amounts of pesticides than corn. Figure 23 presents the estimated trends in corn pesticide use since 1945 from a variety of government sources of information. Herbicide use in corn has increased dramatically since 1964. Figure 10. Percent change in acres of corn in Illinois counties, 1964 to 1987. Source: Department of Commerce, Bureau of the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Dept. of Energy and Natural Resources; Critical T
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