SILVER-LEAF DISEASE. 



315 



other cases. Where branches are broken or trees torn, from whatever 

 cause, the wounds made should be cut cleanly and covered with tar 

 or paint. 



Literature. — This account of the disease has been drawn up partly 

 from observations of the staff at Wisley, partly from the literature 

 of the disease. The principal papers dealing with the disease pub- 

 lished in England (where practically all the experimental work has 

 been done) are : 



1902. Percival, Prof. J. Silver-Leaf Disease, Jour. Linn. Soc, Bot., vol. xxxv. 

 p. 390. 



1910. Massee, G. Conference on Fruit Growing, Jour. R.H.S., vol. xxx. p. 35. 

 1906, 1910. Pickering, S. Woburn Experimental Fruit Farm Reports, 

 6 and 12. 



1911,1913. Brooks, F. T. Silver-Leaf Disease. Jour. Agr. Sci., vol. iv. p. 133 ; 

 vol. v. p. 288. 



1919. Brooks, F. T., and Bailey, M. A. Ibid., vol. ix. p. 189. 

 1919. Bintner, J. Silver-Leaf Disease. Kew Bull., 1919, p. 241 . 



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