Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplant00tube Year: 1897 ERYSIPHEAE. 171 The operation is done by hand or by special implement. One of the best known of these is the ' Sulphur Puffl' This consists of a brush with a hollow stem to contain flowers of sulphur, the end of the stem being perforated to allow the sulj)hur to escape on to the plant. Sulphuring must be carried out during dry weather to prevent the powder being washed away. It has also to be frequent
Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplant00tube Year: 1897 ERYSIPHEAE. 171 The operation is done by hand or by special implement. One of the best known of these is the ' Sulphur Puffl' This consists of a brush with a hollow stem to contain flowers of sulphur, the end of the stem being perforated to allow the sulj)hur to escape on to the plant. Sulphuring must be carried out during dry weather to prevent the powder being washed away. It has also to be frequently repeated, so that young growing shoots, flowers, fruits, leaves, and all parts liable to attack, may be kept well dusted. Sulphur prevents germination of conidia on the leaves; it also kills the mycelium, while the plant itself remains uninjured. Besides sulphuring, various copper solutions give very good results, while at the same time they act as a preventive against the false mildews {Plasmopara, Fcronospora, etc.). Sphaerotheca. Perithecia spherical with thread-like appendages; they contain one spherical ascus with eight colourless oval ascospores. Fio. 08.—Kosc-milihu: Sjihaerollicca pentose. The fungus forms a white luealj- coating on the leaf, especially on the lower side ; the leaves are also more or less curled up. (v. Tubeuf phot.)
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