. 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 Edinburgh. Nectria ipomoeae Hals.^ Stem-rot of egg-plant and sweet potato. In America this attacks young growing plants, and causes stem-rot. The Fusarmm-sta,ge developes as a white mouldy coating on the withered stem, and is followed later by flesh-coloured clusters of perithecia. V *â Poly stigma. On the leaves of species of Prunus, one finds brigh
. 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 Edinburgh. Nectria ipomoeae Hals.^ Stem-rot of egg-plant and sweet potato. In America this attacks young growing plants, and causes stem-rot. The Fusarmm-sta,ge developes as a white mouldy coating on the withered stem, and is followed later by flesh-coloured clusters of perithecia. V *â Poly stigma. On the leaves of species of Prunus, one finds bright-coloured spots, these are the stromata of this family, and in them are embedded pycnidia containing hook- shaped conidia. Perithecia embedded in a similar manner are developed after the fall of the leaves, they contain asci w'ith eight unicellular elliptical spores, which are expelled on reaching maturity in spring. Poly stigma 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 club- fig. &% - Pobjstig, ruhrv,u shaped, long-stalked, and contain eight proAcSred^SscoJtafnSri- spores, which are set free in succession "^^^^T^^ia^ from April to June. Germination ensues rfl£l'ieff!'7v.°?'''* 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. rvhrum, certain hyphae which they designate as trichogynes, while they regard the small form of conidia as spermatia which 1 Description and illustrations in N. Jersey Agrk. Exper. Station Rejwrt, Please note that these i
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherl, booksubjectfungi
