. Bulletin. Natural history; Natural history. 48 ILLINOIS NATURAL HISTORY SURVEY BULLETIN. Fig. 28.—Petri-dish culture of Verticillium alhoatrnm, showing the ap- pearance of the fungus after 12 days on corn meal agar. and Richmond. Its alpha spore range is —— /x but chiefly —8— /x, and the beta spores are mostly ^. The Dutch Phomopsis, according to Buisman, has alpha spores which are generally and stylospores 35X1 ^. The Phomopsis studied by Richmond has alpha spores —— ^ and stylospores —— /x. VERTICILLIUM WILT The wilt due
. Bulletin. Natural history; Natural history. 48 ILLINOIS NATURAL HISTORY SURVEY BULLETIN. Fig. 28.—Petri-dish culture of Verticillium alhoatrnm, showing the ap- pearance of the fungus after 12 days on corn meal agar. and Richmond. Its alpha spore range is —— /x but chiefly —8— /x, and the beta spores are mostly ^. The Dutch Phomopsis, according to Buisman, has alpha spores which are generally and stylospores 35X1 ^. The Phomopsis studied by Richmond has alpha spores —— ^ and stylospores —— /x. VERTICILLIUM WILT The wilt due to Verticillium alboatriim Reinke and Berth, has been found but once among the numerous cases of disease examined and cultured in this investigation. It is, however, said to be of fre- quent occurrence in certain localities in the state, especially near Hills- boro. The tree from which VcrticiUimn was isolated in our study was in a northern nursery. The Verticillium disease affects elms in much the same manner as it does other plants or trees. It forms no cankers on the affected parts. 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. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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