. The diseases of the sweet pea ... Sweet peas. 31 presenting a granular appearance. In young cultures the outer wall of the chlamydospore is smooth, but in old cultures it becomes slightly warty or covered with minute points (Fig. 19). No perfect stage has been found to accompany this fungus either in pure culture or on the Fisrs. 18-31. Fusarium lathvri. showing chlamvdosDores and conidia. Identity of the Fungus. There is no doubt but that the fun- gus belongs to the genus Fusarium. It produces its micro- and macro- spores (sickle shaped) as well as chlamydospores which according to W
. The diseases of the sweet pea ... Sweet peas. 31 presenting a granular appearance. In young cultures the outer wall of the chlamydospore is smooth, but in old cultures it becomes slightly warty or covered with minute points (Fig. 19). No perfect stage has been found to accompany this fungus either in pure culture or on the Fisrs. 18-31. Fusarium lathvri. showing chlamvdosDores and conidia. Identity of the Fungus. There is no doubt but that the fun- gus belongs to the genus Fusarium. It produces its micro- and macro- spores (sickle shaped) as well as chlamydospores which according to Wollenweber86 are true characteristics of the genus Fusarium. The fungus has been grown in pure culture (Fig. 32) and on different media for two years and no perfect stage has ever appeared. Unless further studies prove differently it seems that the present Fusarium is a new species and the name Fusarium lathyri n. sp. is tentatively given to it. A description of the fungus follows: Sporodochia slightly erumpent to superficial on the host, but not always present on culture media. Macroconidia sickle-shaped, slight- ly curved and fitting into the section Martiella of Wollenweber, 2 to 4 septate, the majority being three septate, ;— Microconidia elliptical to oval *—^. Chlamydospores spherical, thick walled and spinulate when old, * borne singly or in chains of twos, threes and sometimes in fours. ROOT ROT OR EEL WORM, Heterodera radicicola (Greef) Muller Altho not belonging to the domain of this thesis the eel worm is here considered, first because of the important root knot disease it. 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 Taubenhaus, Jacob Joseph, 1886- [from old catalog]. Philadelphia
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectsweetpeas, bookyear19
