. Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith. Plant diseases; Parasitic plants. PLASMOPARA. 129 the A'ine. This parasite was introduced into Europe from America.^ It makes its appearance in early summer as white patches on the under surfaces of leaves, sometimes also on stalks and fruit. In the course of the summer the leaves show brown spots and dry up. The white patches consist of tufts of branched conidiophores, from which ovoid conidia are abjointed. These on germiua-.
. Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith. Plant diseases; Parasitic plants. PLASMOPARA. 129 the A'ine. This parasite was introduced into Europe from America.^ It makes its appearance in early summer as white patches on the under surfaces of leaves, sometimes also on stalks and fruit. In the course of the summer the leaves show brown spots and dry up. The white patches consist of tufts of branched conidiophores, from which ovoid conidia are abjointed. These on germiua-. Fio. 40.—PtasmojK'ra viticola. Conidiophores, much eiihirged. (v. Tiiboiif ik-l.) tion in raiii-drnps di,schai-y;c six to eight swarming cells from which germ-tubes grow into the epidermis of the host-plant ; thus the disease spreads rapidly duiing moist weather and a I'trouoxjiora i-iticola, 1890. , Wiltmark's (,'arftiiziit, iSSli. liejiorl of D^]lt. of Aiiriniitiiri- for I88(j, pp. (IG-lOri ; tliis lontaiiis an excellent account of this niiMew. Aitiilcs on tliis siilpjtrt ilialinj; witli ivnu-tlial nieaMures arc fie<nuiitly piil);. Anur. I»eii:ii tniint ii'iiorts and ItulietinH, in tlic Imlktiiis from oxpei iniental stations, ami in tin- lioitiLiiltural , ' .Seymour and Fallow give it as occurint{ on every American spicies of I' 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 Tubeuf, Karl, Freiherr von, 1862-. London Longman's, Green
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectparasit, bookyear1897
