386 MANUAL OF FRUIT DISEASES 



FIRE-BLIGHT 

 Caused by Bacillus amylovorus (Burr.) Trev. 



This is the disease which is so common on pears, apples and 

 quinces in North America. Plums may be regarded as a minor 

 and an occasional host ; they are rarely affected. Apparently 

 fire-blight was not observed on plums until July, 1894, although 

 other records of the disease date back nearly a century before. 

 The trouble on plums was first seen in Connecticut, and seven 

 years later (1901) it was noted in Vermont. Recently fire- 

 blight has been recorded on Italian prunes from Oregon. On 

 plum the disease resembles closely twig-blight of pome-fruits. 

 Shoots are suddenly blighted back for a distance of six to 

 eighteen inches from the tip. Full account of fire-blight under 

 Pear, see page 323. 



REFERENCES 



Jones, L. R., and Morse, W. J. Orchard diseases and their remedies. 



II. Studies upon plum blight. Vermont Agr. Exp. Sta. Rept. 15 : 



231-239. 1902. 

 Jones, L. R. Studies upon plum blight. Centbl. f. Bakt. u. Par. 2 : 



9 : 835-841. 1902. 

 Jackson, H. S. Fire blight on prune. Oregon Crop Pest and Hort. 



Bienn. Rept. 1913-1914:279-281. 1915. 

 Sturgis, W. C. A "fire blight" of plum trees. Connecticut Agr. 



Exp. Sta. Rept. 18 : 117-118. 1895. 



