286 BUSH-FRUITS 



Treatment. Diseased plants should be rooted up and burned 

 as soon as discovered, to prevent the spore formation and con- 

 sequent spread of the disease. This, if promptly done, is a prac- 

 tical remedy. Spraying can only be of use in pre- 

 venting new infection. If employed against the 

 anthracnose, it will also be of use against red rust 

 spores, if they exist. 



ANTHRACNOSE (Fig. 44) 



Glceosporium Venetum, Speg. 



Gloeosporiuin necator. Ell. and Ev. Jour. Myc. 3: 129. 



Order Melanconieae. 



Saccardo, Syll. Fung. 3: 706, and 10: 450. Burrill, Agr. 

 Review, 1882: Nov. Galloway, Rep. U. S. Dept. Agr. 1887: 

 357. Paddock, Bull. New York State Exp. Sta. 124: 261-274. 



This is unquestionably one of the most serious ene- 

 mies to raspberry and blackberry culture now known. 

 The disease was first described by an Italian botanist, 

 M. Spegazinni, from leaves of Rubus Chamcemorus. 

 Its first mention in this country was in the Agri- 

 cultural Review for November, 1882, by T. J. Burrill, 

 who referred to it as the Raspberry Cane Rust. In 

 1887, Messrs. Ellis & Everhart, in The Journal of 

 Mycology, Vol. Ill, p. 129, described the disease as 

 a new species under the name Glceosporium necator. 



The gray discolored spots caused by this fungus 

 are well known to all berry growers. They are found 

 thracnose^n- on a11 P arts of * ne plant above ground. On the leaf 

 citing knotty surface, however, they are not easily distinguished 

 growth on red from those of Cylindrosporium and Septoria. They 

 raspberry- often become so numerous that they destroy a large 

 part of the living cane and greatly weaken or even kill it. The 

 disease is especially liable to work injury just at the ripening 

 period. On red raspberries its presence sometimes incites a 

 warty growth like that shown at Fig. 44. 



The mycelium, creeping between the plant cells, causes their 

 destruction and the consequent appearance of the dead spots. 



