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.
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 Might" of plum trees. Connecticut Agr.
Exp. Sta. Rept. 18: 117 - 118. 1895.