. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. NECTRIA. 189 of Breslau, Berlin, Paris, Kew, Glasnevin (Dublin), and Edinburuli. Nectria ipomoeae Hals.^ Stem-rot of egg-plant and sweet potato. In America this attacks young growing plants, and causes stem-rot. The Fusarium-stage developes as a white mouldy coating on the withered stem, and is followed later by tlesh-colonred clusters of perithecia. Poly stigma. On the leaves of species of Prnnus, one finds bright-co
. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. NECTRIA. 189 of Breslau, Berlin, Paris, Kew, Glasnevin (Dublin), and Edinburuli. Nectria ipomoeae Hals.^ Stem-rot of egg-plant and sweet potato. In America this attacks young growing plants, and causes stem-rot. The Fusarium-stage developes as a white mouldy coating on the withered stem, and is followed later by tlesh-colonred clusters of perithecia. Poly stigma. On the leaves of species of Prnnus, one finds bright-coloured spots, these are the stromata of this family, and in them are embedded pycnidia containing hook- shaped conidia. Terithecia end)edded in a similar manner are developed after the fall of the leaves, they contain asci with eight unicellular elliptical spores, which are expelled on reaching maturity in spring. Polystigma rubrum (Pers.) (Britain and America). This appears as red circular spots on the leaves of plum and sloe. Micropycnidia are developed in summer on the under-surface of the leaf and give rise to curved conidia. The perithecia begin their development in summer, but only reach maturity in the following spring, after the leaves have fallen from the tree and lain on the ground over winter. The asci are clul)- shaped, long-stalked, and contain eight spores, which are set free in succession from April to June. Germination ensues on young leaves, and in six weeks pycnidia reappear. A variety, "Amygdali Desm,," is found on the leaves of the almond {Amygdalus communis). Frank and Fisch found in connection with P. rvhrvm, certain hyphae which they designate as trichogynes, while they regard the small form of conidia as spermatia whicli ^Description and illustrations in X. Jersey Agrk. Exper. Station Report, Fio. S2. — Polvslig„M rxihruiii. on a leaf of Plum. The largo projecting red spots contain peri- thecia and spermogonia. Dark brown
Size: 1058px × 2361px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublisherl, booksubjectfungi
