14 PEACH LEAF CUKL: ITS NATURE AND TREATMENT. 



disoaso and its cause arc Sadebeck/ Winter,^ Do Baiy,'^ von Tavel,* 

 Ha! tig,-' Zopf,'' Tu])cuf/ Ludwig,* Sorauer," Frank/" Kirchner/^ 

 Fiickel/' and others. Winter says (1. c.) that the fungus of this 

 malady causes great damage by early defoliation of the trees, and that 

 it even kills the diseased trees by its repeated occurrence. 



In Great Britain peach leaf curl has been common for a great many 

 years. In 1821 it was accurately described by an English gardener 

 under the name of "blight." He says:^^ "Under this denomination 

 [blight] are frequently confounded two varieties of disease materially 

 different in their appearance, and which I shall distinguish by the 

 appellation of Uister and curl. The former is generally confined to 

 such peach trees as have glandular leaves, which are mostly subject 

 to it in the months of April and May, and when attacked it is not 

 until the latter part of the season, if at all, that they become healthy. 

 The leaves so attacked are crisp, and assume a swollen, crumpled, and 

 succulent appearance; the shoots themselves are affected by it in the 

 same manner, and never produce either good blossom or healthy wood." 

 Berkeley ^* has described the fungus causing this disease, and it has 

 been mentioned l)y Bennett and Murray ^"^ and many other English 

 writers. (Consult a popular article on Peach Blister, by W. G. Smith, 

 Gardmers- Chronicle^ Vol. IV, pp. 36, 37.) 



'Sadebeck, Dr. R., see locations cited; also Einige neue Beobachtungen nnd krit- 

 ische Bemerkuiigen tiber die Exoascacete, Bot. Ges., 1895, Band XIII, Heft 6. 



^Winter, Dr. Georg, Die durch Pilze verursacliten Krankheiten der Kulturge- 

 wiichse, Leipzig, 1878, p. 47; also Rab. Krypt. Flora, 1885, II, p. 6. 



^De Bary, Prof. A., Comparative Morphology and Biology of the Fungi, Myceto- 

 zoa, and Bacteria, English edition, Oxford, 1887, p. 265; see also in the same volume 

 various other references to the arrangement and position of tlie Exoascus group. 



*Tavel, Dr. F. von, Vergleichende Morphologie der Pilze, Jena, 1892, pp. 55,56. 



^Hartig, Dr. Robert, Lehrbuch der Baumkrankheiten, Berlin, 1889, p. 118; also 

 the English edition. Text-book of the Diseases of Trees, London, 1894, p. 132. 



^Zopf, Dr. AVilhelm, Die Pilze in morphologischer, physiologischer, biologischer, 

 und systematischer Beziehung, Breslau, 1890, pp. 236, 282. 



"Tubeuf, Di-. Karl Freiheer von, Pflanzenkrankheiten durch kryptogame Para- 

 siten verursacht, Berlin, 1895, pp. 167-188. 



*Ludwig, Dr. Friedrich, Lehrbuch der Niederen Kryptogamen, Stuttgart, 1892, 

 p. 205. 



^Sorauer, Dr. Paul, Handbuch der Pflanzenkrankheiten, Zweiter Theil, Die para- 

 sitilren Krankheiten, Berlin, 1886, p. 278. 



"Frank, Dr. A. B., Die Krankheiten der Pfianzen, Band II, Die Pilzparasitaren 

 Krankheiten, Breslau, 1896, pp. 249, 250. Edition of 1880-81, Vol. II, p. 526. 



iiKirchner, Dr. Oskar, Die Krankheiten und Beschiidigungen unserer landwirt- 

 schaftlirhen Kulturpflanzen, Stuttgart, 1890, pp. 324, 407. 



'^Fuckel, L., Symbote mycologicae, 1869, p. 252. 



" See quotation in Report of Michigan Pomological Society for 1873, pp. 16, 17. 



"Berkeley, M. J., Introduction to Cryptogamic Botany, 1857, p. 284, and Outlines 

 of British Fungology, London, 1860, pp. 376, 444, tab. 1, fig. 6. 



15 Bennett, A. W., and Murray, George, A Handbook of Cryptogamic Botany, 

 London, 1889, p. 379. 



