Diseases of plants induced by 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 diseasesofplants00tubeuoft Year: 1897 214 ASCOMYCETES. active vegetation begins about two and a half months later than in the plains, at the beginning of June. The season of mature spores of Sx>haerclla is thus delayed till about the middle of August. On 2Gth September I found at this elevation only a few spots on the larch needles, and on these hardly any conidial cushions. By 28th Septe
Diseases of plants induced by 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 diseasesofplants00tubeuoft Year: 1897 214 ASCOMYCETES. active vegetation begins about two and a half months later than in the plains, at the beginning of June. The season of mature spores of Sx>haerclla is thus delayed till about the middle of August. On 2Gth September I found at this elevation only a few spots on the larch needles, and on these hardly any conidial cushions. By 28th September this larch plantation was already under snow.' ' It will thus be seen, that while at a high elevation the larch can flourish with a vegetative period extending only to three and a quarter or four months, the Sphaerella has not the time necessary for its develop- ment, so that the larch, though much handicapped, remains healthy. Similarly with the larch in Siberia, it grows there, as in the mountains, very slowly, yet this parasite can no longer reach it.' Sphaerella fragariae Tul. Strawberry leaf - blight. In summer free conidia {Ramularia Tulasnei Sacc.) and pycnidia are produced, while the perithecia ripen in spring. [This destructive disease of the strawberry has been recorded from all parts of the United States. It first appears on the upper surface as small reddish spots, which rapidly enlarge, the centres withering and browning. The growth of the plants and the crop-yield is seriously impaired.] (Edit.) Sph. gossypina Atks. [Cotton leaf-blight is a disease on leaves of the cotton plant caused by the of this fungus. Small reddish spots appear on the leaf, enlarge, and become dry whitish spots with a red margin. The conidia are elongated and produced in long chains. The asci contain eight elliptical spores, which are slightly constricted at the septum when mature, one cell being usually somewhat smaller than the other. This disease frequently accompani
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