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, etc. U. S. 



Agr. Comm. Kept. 1887 : 353-355. 1888. 

 Cobb, N. A. Peach rust in our orchards. New South Wales Agr. 



Gaz. 1 : 93. 1890. 



Pierce, N. B. Prune rust. Journ. Myc. 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. Bui. 45 : 67-68. 1897. 



WILT 



Caused by Lasiodiplodia Triflorce 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. Ill) 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. 



