. Bulletin of the Department of Agriculture. Agriculture; Agriculture. JTL^'^S'U BULLETIN No. 395 Contribution from the Bureau of Plant Industry WM. A. TAYLOR, Chief. Washington, D. C. PROFESSIONAL PAPER. January 18, 1917 PEACH SCAB AND ITS CONTROL/ By G. W. Keitt, Assistant Professor of Plant Pathology, University of Wisconsin; formerly Scientific Assistant, Fruit-Disease Investigations. CONTENTS. Page. Introduction 1 The disease 3 Geographic distribution 3 Economic importance 4 Description 6 Pathological histology S The causal organism 11 Taxonomy 11 Morphology 12 Physiology 14 Pathogen
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. JTL^'^S'U BULLETIN No. 395 Contribution from the Bureau of Plant Industry WM. A. TAYLOR, Chief. Washington, D. C. PROFESSIONAL PAPER. January 18, 1917 PEACH SCAB AND ITS CONTROL/ By G. W. Keitt, Assistant Professor of Plant Pathology, University of Wisconsin; formerly Scientific Assistant, Fruit-Disease Investigations. CONTENTS. Page. Introduction 1 The disease 3 Geographic distribution 3 Economic importance 4 Description 6 Pathological histology S The causal organism 11 Taxonomy 11 Morphology 12 Physiology 14 Pathogenicity 21 Life history of the causal organism in relation to pathogenesis 32 Seasonal development of the disease 32 Production of conidia 33 Viability and longevity of conidia 35 Life history, etc.—Continued. Dissemination of conidia 36 Method of infection 40 Period of incubation 41 Time of natural infection 42 Som-ces of natural infection 42 Overwintering of the fungus 43 Climate in relation to the disease 44 Varieties in relation to the disease 44 Control measures 46 Spraying 46 Orchard sanitation 60 Resistant varieties 60 Summary 61 Literature cited 64 INTRODUCTION. Peach scab (Cladosporium carpopMlum Thiim.) is a parasitic disease whicli affects the fruit, twigs, and leaves of the host (Amygdalus persica). It manifests itself on the fruit as small, circular, olivaceous to black spots, which frequently become confluent over considerable areas and seriously detract from the appearance, quality, and value of the marketable product. On the twigs and leaves it occasions less damage, producing small superficial injuries, which are described in detail later. In the United States, east of the Rocky Mountains, it occurs generally, and unless controlled it may cause serious financial 1 The laboratory studies upon which this paper is based were conducted in field laboratories at Hart, Mich., in the season of 1911, at Cornelia, Ga., in the seasons of 1912 and 1913, and in the laborato
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