. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. Figure 25. Percent change in number of acres of farmland receiving insecticides, 1964 to 1987. Source: Department of Commerce, Bureau of the Census. Figure 26. Percent change in number of acres of farm- land receiving commercial fertilizer, 1964 to 1987. Source: Department of Commerce, Bureau of the Census. Table 1, Percentage of corn acreage treated with soil insecticide in Illinois, 1969
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. Figure 25. Percent change in number of acres of farmland receiving insecticides, 1964 to 1987. Source: Department of Commerce, Bureau of the Census. Figure 26. Percent change in number of acres of farm- land receiving commercial fertilizer, 1964 to 1987. Source: Department of Commerce, Bureau of the Census. Table 1, Percentage of corn acreage treated with soil insecticide in Illinois, 1969-1990. Source 1969 1972 1976 1978 1982 1985 1988 1990 Kuhlmanetal. 1989 Pikeetal. 1991 70 60 56 65 64 53 47 42 42 32 30 29 may affect the survival of threatened and endangered species through habitat destruction, alteration of the physical and chemical properties of streams, and the fragmentation of wooded and grassland tracts. More- over, where natural areas hosting rare species are bordered by agricultural environments, the flora and fauna are potentially subject to farming disturbances in the surrounding land mosaic. The status of threatened and endangered species on agricultural lands is for the most part unknown. In addition, the potential impact of agriculture on the remaining threatened and endangered species in the coming decade has not been assessed. Declines in the abundance of upland game since the 1960s (Figure 27) are a case study of how intensive agriculture has negatively affected habitat for many wildlife species traditionally common to the farm landscapes of Illinois. The declines in upland game populations and other farmland wildlife associated with habitat loss are due to expanded row crop production and the reduction in the amount of oats, perennial vegetation such as hay, and uncropped farmland, including wetlands, savannas, and permanent pasture. Farm programs diverting cropland from production were important for establishing upland wildlife habitat during
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