. Bulletin. Natural history; Natural history. September, 1955 Forsberg: Fusarium Disease of Gladiolus 451 hard, rough, and usually somewhat scaly after the conns are dry. The affected area is sunken, and there is a sharp line of de- marcation between diseased and healthy tissues. While the majority of diseased corms in any given lot usually have symptoms characteristic of only one of the disease forms, it is not uncommon to find corms that have symptoms of two of the disease forms or symptoms intermediate between them, tig. 4. Bald (1953) stated, "In any large collection of gladiolus vari
. Bulletin. Natural history; Natural history. September, 1955 Forsberg: Fusarium Disease of Gladiolus 451 hard, rough, and usually somewhat scaly after the conns are dry. The affected area is sunken, and there is a sharp line of de- marcation between diseased and healthy tissues. While the majority of diseased corms in any given lot usually have symptoms characteristic of only one of the disease forms, it is not uncommon to find corms that have symptoms of two of the disease forms or symptoms intermediate between them, tig. 4. Bald (1953) stated, "In any large collection of gladiolus varieties in- fected with Fusarium diseases it ha:- not been found possible to maintain on a symp- tomological basis the division between Fu- sarium basal rot and Fusarium yellows. On different varieties a gradation was found between the 2 symptom ; ETIOLOGY The etiology of the Fusarium disease of gladiolus is quite typical for that of plant diseases caused by fungi of the genus Fti- sarium. The occurrence of the disease in more than one form and the great varia- bility commonly found in species of Fu- sariutii have contributed to the confusion regarding the cause of this disease. Previous Accounts A report by Massey (1922) was the first published account of a gladiolus dis- ease in which a fungus of the genus Fu- sarium was established as the cause. A more extensive description of this disease and its causal agent was later published by. Fig. 3.—Corms of three gladiolus varieties affected with the basal dry rot form of the Fusarium disease: top row, variety CJold Eagle; middle row, Lake Placid; bottom row, Spot- light. The two sectioned Spotlight corms show the extreme thinness of the rotted 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,
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
