380 MANUAL OF FRUIT DISEASES 
through the winter, and rust developed thereon permits early 
spring infections which bring about considerable damage to the 
orchard. In Oregon it is thought that bordeaux spraying the 
last of August or the first of September will prove profitable. 
REFERENCES 
Scribner, F. L. Leaf rust of the cherry, peach, plum, ete. U. S. 
Agr. Comm. Rept. 1887 : 353-355. 1888. 
Cobb, N. A. Peach rust in our‘orchards. New South Wales Agr. 
Gaz. 1:93. 1890. 
Pierce, N.B. Prunerust. Journ. Mye. 7: 354-363. 1894. 
McAlpine, D. Peach- and plum-leaf rust. Victoria Agr. Dept. 
Guides to Growers, 5: 1-8. 1891. ; 
Hedrick, U. P. Prunes in Oregon. Prune rust. Oregon Agr. Exp. 
Sta. Bul. 45: 67-68. 1897. ; 
WILT 
Caused by Lasiodiplodia Triflore Higgins 
Apparently this disease is very limited in its geographical 
range. Reports of it come from only three states, Georgia, 
North Carolina and Alabama. In this region, however, it is of 
‘considerable importance, and in Georgia more especially it is 
regarded as an important factor in commercial plum-growing. 
Japanese plums and their hybrids are particularly sensitive to 
wilt. The disease appears to have been known for several years. 
Symptoms. 
Plum-wilt (Fig. 111) resembles fire-blight and for some years 
was thought to be of a similar nature. Leaves on a branch or a 
whole tree suddenly wilt in the spring or early summer. Ex- 
amination of the base of the wilted portion will reveal dark, 
dead bark. Frequently this dead area extends along one side 
of the trunk to the surface of the ground. Within a year from 
first wilting, the whole tree may die. 
