. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. SCLEROTINIA WITH BOTRYTIS-CONIDIA. 269 Sclerotia, along with Botri/tis-comdia, have been found fre- quently on diseased geraniums. During the summer of 1894 a withering of twigs of Prunus triloba occurred in several gardens at Munich (Fig. 141). A mycelium was found in the bark, leaf-petioles, and young ovaries, while Botrytis-coni(\.i?i were developed on the dead parts. With these I successfully infected young needle
. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. SCLEROTINIA WITH BOTRYTIS-CONIDIA. 269 Sclerotia, along with Botri/tis-comdia, have been found fre- quently on diseased geraniums. During the summer of 1894 a withering of twigs of Prunus triloba occurred in several gardens at Munich (Fig. 141). A mycelium was found in the bark, leaf-petioles, and young ovaries, while Botrytis-coni(\.i?i were developed on the dead parts. With these I successfully infected young needles and twigs of spruce. Sclerotia were also formed on plum- gelatine in fourteen days. The parasite in this case had killed old twigs of Prunus, and also infected twigs of Conifers. Botrytis Douglasii is a parasite which I studied some time ago on account of its presence along with a disease on the Douglas fir (Pscii- dotsuga Douglasii)} I have since had reason to believe that it is allied to some form of sclerotium like that just considered, and my view is supported by ; The disease as seen in various parts of Germany is characterized by withering, curling-up, and death of young shoots towards the sum- mits of young seedlings, and on the lower twigs of older trees up to about five feet above the ground. In autumn, black sclerotia about the size of pin heads, break through the epidermis under the old bud- scales, at the base of dead shoots, and on the needles. In addition to these, smaller masses of tangled hyphae are also formed. When sclerotia are placed in a moist chamber, tufts of erect conidiophores arise, and branch, forming numerous whorls of conidiophores, from which 1V. Tubeuf, Beitrclge z. Kenntniss d. BaumkranMieiten, Berlin, 1888. -Behreiis, Zeitsch. f. Pflanzenkrankheiten, Fig. 142.—Botrytis Douglasii on the Douglas Fir. The young shoots and apex of last year's shoot are dead. (After Tubeuf.). Please note that these images are extracted from sc
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