46 FUNGI AXD FUNGICIDES 



been noticed. Consequently, siicli cultural methods as. 

 will tend to produce a slow, steady growth are to he- 

 adopted. 



Literature. — The really valuable publications con- 

 cerniug pear blight date from Professor Burrill's an- 

 nouncement of the genuine cause in 1880. His articles 

 may be found in tlie following joublications : Transac- 

 tioQs Illinois State Horticultural Society, 1880, pp. 157— 

 167 ; 1883, pp. 4G-49 ; Eeport American Pomological 

 Society, 1880 ; Report Trustees Illinois Industrial Uni- 

 yersity, 1880 ; Transactions Illinois Department of Ag- 

 riculture, 1880, pp. 433-43G. Professor J. C. Arthur 

 has also published a number of valuable papers. A sum- 

 mary of his results may be found in the Eeport U. S. 

 Department of Agriculture, 1886, pp. 125-129 ; Report 

 of the American Pomological Society, 1885 ; and RejDort 

 of the Michigan Horticultural Society, 1885, pp. 173-177. 

 More recently Mr. M. B. Waite has been investigating 

 the disease. His results may be looked for in the publi- 

 cations of the Division of Vegetable Pathology. 



The Pear Scab 



Fus idadiuni pyrinu m 



This disease is very similar to apple scab, the fun- 

 gus, in fact, being believed by many botanists to be the 

 same species. At any rate, the chief points in the life- 

 history and remedial treatment are the same as for the 

 apple disease. 



Care should be taken not to apply the Bordeaux 

 mixture too late in the season. Early varieties should 

 have but one spraying with this mixture after the fruit 

 '•^sets," and late varieties but two. Where additional 

 applications are needed, use the copper carbonate solution. 



