Fire Blight of Pears, Apples, Quinces, Etc. 



151 



*94 Denning, W. M. 



!8i Burrill, T. J. 



:8i Burrill, T. J. 



'85 Arthur, J. C. 



'86 Arthur, J. C. 



'87 Arthur, J. C. 



'87 Arthur, J. C. 



'96 Waite, M. B. 



'98 Waite, M. B. 



•06 Waite, M. B. 



'02 Jones, L. R. 



'03 Paddock, Wendell 



'06 Whetzel, H. H. 



'09 Sackett, W. G. 



On the Decay of Apple Trees. Trans. See. For Pro- 

 motion of Agriculture, etc. I (Pt. 2):2i9-222. 



1794. (See also 2d Edit., 1801:185-187.) 

 Anthrax of Fruit Trees: or the so-called Fire Blight 



of Pear or Twig Blight of Apple Trees. Proc. Am. 



Assoc. Adv. Sci. 29:583-597. 1881. 

 Blight of Pears and Apple Trees. 111. Indus. Univ. 



Rep. 10:62-84. 1 881. 

 Proof that the Disease of Trees Known as Pear Blight 



is Directly Due to Bacteria. N. Y. (Geneva) State 



Exp. Sta. Bui. 2:1-4. 1885. 

 Pear Blight. N, Y. (Geneva) State Exp. Sta. Rep. 



1885:241-248. 1886. 

 Pear Blight. N. Y. (Geneva) State Exp. Sta. Rep. 



1886:275-289. 1887. 

 Important Articles on Pear Blight. N. Y. (Geneva) 



State Exp. Sta. Rep. 1886:300-315. 1887. 

 Cause and Prevention of Pear Blight. U. S. D. A. 



Year Book 1895:295-300. 1896. 

 Life History and Characteristics of the Pear Blight 



Germ. Proc. Amer. Assoc. Adv. Sci. 47:427-428. 



1898. 

 Pear Blight and its Control in California. State Hort. 



Comm. of Calf. (Special Report) 1906:1-20. 1906. 

 Studies on Plum Blight. Centrbl. f. Bakt. Parasitenk. 



u. Infek. 2 (Abt. 11) :835-84i. 1902. 

 An Apricot Blight. Colorado State Exp. Sta. Bui. 



84:1—14. 1903. 

 The Blight Canker of Apple Trees. N. Y. (Cornell) 



Exp. Sta. Bui. 236:99-138. 1906. 

 Some Bacterial Diseases of Plants. Colorado State 



Exp Sta. Bui. 138:6-14. 1909. 



TREES AFFECTED 



The pear, quince, apple, hawthorn (Crataggus), mountain ash, plum, 

 apricot and a few ornamentals belonging to the apple family are known 

 to be affected by this disease. The pear and quince suffer most, although 

 the apple is often seriously injured and may be killed, particularly young 

 trees. Plums are rarely attacked, but Jones ('02) has proved conclus- 

 ively that the disease will attack and kill the twigs of the Cheney plum 

 (Prunics Americana Nigra). The senior author has also observed what 

 appeared to be this disease killing prune trees. It is not known to 

 occur in the cherry or the peach. 



Varietal susceptibility and resistance. It has long been observed 

 that varieties of pears appear to differ in regard to their susceptibility 

 to this malady. Those varieties most susceptible, i.e., most frequently 

 and severely attacked, according to Sackett ('09), are Bartlett, Flemish 

 Beauty and Clapp's Favorite, while among those especially resistant 



'02 Jones, L. R. Studies on Plum Blight. Centrbl. f. Bakt. Parasitenk. 



u. Infek. 2 (Abt. 11) :835. 

 '09 Sackett, W. G. Some Bacterial Diseases of Plants. Colorado State Exp. 



Sta. Bui. 138:13. 



