. Dutch elm disease in Illinois. Fungicides; Scolytus multistriatus; Hylurgopinus rufipes; Dutch elm disease. Fig. 17.—An ax frill, in which potassium iodide is introduced into a tree, is made by chopping a continuous angling cut around the trunk. Foliar spray. To obtain maximum protection of special value elms, a foliar spray can be applied after second growth of leaves occurs, usually in late July in Illinois. This foliar spray is half the strength of the dormant spray described in the "Spraying" section. It is not recommended for a communitywide control Please note that
. Dutch elm disease in Illinois. Fungicides; Scolytus multistriatus; Hylurgopinus rufipes; Dutch elm disease. Fig. 17.—An ax frill, in which potassium iodide is introduced into a tree, is made by chopping a continuous angling cut around the trunk. Foliar spray. To obtain maximum protection of special value elms, a foliar spray can be applied after second growth of leaves occurs, usually in late July in Illinois. This foliar spray is half the strength of the dormant spray described in the "Spraying" section. It is not recommended for a communitywide control 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 Carter, J. Cedric (James Cedric), 1905-; Illinois. Natural History Survey Division. [Urbana]
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