. Bulletin. Natural history; Natural history. 452 Illinois Natural History Survey Bulletin Vol. 26, Art. 6 the same worker (1926). Massey classi- fied the ortianism as iusariitm oxysporum Schlecht. emend. VVr. var. yladioH n. var. McCulloch (1944) considered the /•';/- sarium she found associated with the vas- cular form of the diease to be sufficiently distinct from iiisorhim oxysporum var. (jlaiUoli, described by Massey, to warrant putting it in another species. She classified it as I'usarium orthoceras App. et Wr. var. gladioli. In comparing the two organisms she stated. "In culture th
. Bulletin. Natural history; Natural history. 452 Illinois Natural History Survey Bulletin Vol. 26, Art. 6 the same worker (1926). Massey classi- fied the ortianism as iusariitm oxysporum Schlecht. emend. VVr. var. yladioH n. var. McCulloch (1944) considered the /•';/- sarium she found associated with the vas- cular form of the diease to be sufficiently distinct from iiisorhim oxysporum var. (jlaiUoli, described by Massey, to warrant putting it in another species. She classified it as I'usarium orthoceras App. et Wr. var. gladioli. In comparing the two organisms she stated. "In culture the bulb-rot organ- ism has. in most tests and examinations, shown less abundant aerial growth, less pigment, and wider macrospores than the yellows organism. . The most distinctive characteristics of these two Fusaria of gladiolus are the effects on the ; Other workers have been inconsistent in their use of names for the causal agents of the different forms of the disease. Mc- Clellan (1945) used the name lusaritini orthoceras App. & Wr. var. gladioli Mc- Culloch for the vascular Fusarium of glad- iolus. In a later article the same writer (1947) listed F. oxysporum f. gladioli Sny. & Hans, as the causal agent for yel- lows and rot. He described the other forms of the disease but did not name the causal agents. McCIellan &: Stuart (1947) used the name /•'. oxysporum f. gladioli (Massey) Sny. & Hans, for the causal agent of gladiolus "vellows, or corm ; McCIellan (1948)'used both names. /•'. oxysporum var. gladioli Massey and F. or- thoceras var. gladioli McCulloch. Nelson (1948) listed F. orthoceras WoU. var. gladioli McCull. as the cause of yellows,. Fig. 4.—Sectioned corms of gladiolus variety Dieppe, in upper two rows, and Golden Arrow, in lower two rows, showing symptoms of all three forms of the Fusarium disease. The second corm from the left in the top row shows core rot and vascular discoloration. The first and third corms in
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