. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. AGRICULTURAL LANDS. Figure 31. Spread of gypsy moth defoliation in the United States, 1900-1991. Source: Forest Sen'ice. Table 3. Major agricultural plant pests in Illinois. Plants are listed in order of descending economic importance for weed control efforts. Velvetleaf Foxtail Cocklebur Pigweed Smartweed Giant ragweed Annual morning glory Common ragweed Lambsquarter Jimsonweed Hemp dogbane Mi
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. AGRICULTURAL LANDS. Figure 31. Spread of gypsy moth defoliation in the United States, 1900-1991. Source: Forest Sen'ice. Table 3. Major agricultural plant pests in Illinois. Plants are listed in order of descending economic importance for weed control efforts. Velvetleaf Foxtail Cocklebur Pigweed Smartweed Giant ragweed Annual morning glory Common ragweed Lambsquarter Jimsonweed Hemp dogbane Milkweed (common) Black nightshade Fall panicum Shattercane Yellow nutsedge Canada thistle Source: Pike etal. 1991. underground water supplies and tributaries has led to serious problems of siltation and chemical alterations in nearly all aquatic environments in the state. During the past decade, however, some significant progress has been made in addressing environmental problems related to agriculture. For example, the adoption of conservation tillage methods has become widespread and continues to increase. There is also evidence that insecticide use has declined statewide as integrated pest management practices have been adopted. LITERATURE CITED Kuhlman, Knake, Gray, and Dirby. 1989. IPM: a systems approach to sustainability. Illinois Resource 31:15-18. National Research Council. 1989. Alternative agricul- ture. National Academy Press, Washington, 448 p. 84. 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 Trends Assessment Project. Springfield, Ill. : Ill. Dept. of Energy and Natural Resources
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