Bulletin of the U.S. Department of Agriculture Volume a -A - 391-399

Bulletin of the U.S. Department of Agriculture Volume a -A - 391-399

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 edition. Excerpt: ... Spraying 46 Orchard sanitation 60 Resistant varieties 60 Summary 61 Literature cited 64 INTRODUCTION. Peach scab (Cladosporium carpopliilum Thum.) is a parasitic disease which 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, Oa., in the seasons of 1912 and 1913, and in the laboratory of plant pathology of the University of Wisconsin in the winters of 1911 to 1914 and the summer of 1914. The field work was carried on in cooperation with growers in commercial orchards at Hart, Mich, in 1911, and at Cornelia, Oa., in 1910, 1912, and 1913. 48408--Bull. 395-17 1 losses in practically all of the important peach-producing districts in this area. The disease was first reported from Klostemeuberg, Austria, by Von Thiimen (1877),1 who observed its occurrence upon the fruit of the peach and briefly described the associated fungus as Cladosporium carpophilum sp.' nov. The same author (1879, p. 13-15) emended his original description of the fungus and published notes concerning the occurrence, description, and economic importance of the malady. The disease received little further attention until its occurrence in...show more

Product details

  • Paperback
  • 189 x 246 x 7mm | 245g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236990846
  • 9781236990846