386 MANUAL OF FRUIT DISEASES 
Firt-BiLiGHT 
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. 
