. Annual report of the New York State College of Agriculture at Cornell University and the Agricultural Experiment Station. New York State College of Agriculture; Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). The Anthracnose Disease of the Raspberry 173 The growth of the fungus in culture is very peculiar. Miss Stoneman (1898) states that several isolations were made before she was satisfied that she had obtained the desired organism. The conidia germinate on various kinds of agar within a period of from three to twelve hours (fig. 18). From a single con
. Annual report of the New York State College of Agriculture at Cornell University and the Agricultural Experiment Station. New York State College of Agriculture; Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). The Anthracnose Disease of the Raspberry 173 The growth of the fungus in culture is very peculiar. Miss Stoneman (1898) states that several isolations were made before she was satisfied that she had obtained the desired organism. The conidia germinate on various kinds of agar within a period of from three to twelve hours (fig. 18). From a single conidium one or more germ tubes are developed, which at first grow rapidly. Septa are formed, the cells become swollen, and soon the conidium is indistinguishable from the cells of the mycelium. In tap or rain water, growth ceases at this stage. No appressoria have been noticed. On potato or nutrient agar, the primary germ tubes branch, and their cells, which are globose, form a more or less compact mass. The colony is circular in outline and as the mycelium grows older the color changes to a pale vinaceous pink. Hyphae radiate in all directions from the fungous mass but only for an exceedingly short distance. On media containing a small amount of agar a more nutri- tive growth occurs, the hyphae of which are filamentous, with occasional globose cells. The aerial growth of this fun- gus in culture is comparatively slow, and continues as a piling- up of cells forming a wrinkled mass having the appearance of sclerotia (fig. ig). In some cases this mass has a shining appear- ance, while in others fine aerial hyphae are formed over the compact growth. The color of the culture varies from light russet- vinaceous to maroon, while the edges of the colonies are lighter in color due to the younger mycelium. The cells of the hyphae in the young colonies are very minute but become somewhat larger as they grow older. The diameter of the filamentous hyphae is from to ju, while frequent
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