356 



The Spraying of Plants. 



canes first. The affected parts are circular but later oval in 

 outline (Fig. 85), the central part is gray in color, and this is 

 surrounded by a distinct purple rim. These areas are sunken, 

 and when several run together they may cause the cracking of 

 the cane, or even its death. The leaves are also attacked to a 

 limited extent, but with no such serious results. When the 

 fruit stems are diseased, the berries are frequently prevented 

 from ripening, and consequently they dry up on the bushes. 



Treatment. An- 

 thracnose has not 

 yet been very suc- 

 cessfully treated. 

 The best recom- 

 mendations which 

 can now be given 

 are to spray the 

 bushes thoroughly 

 with the copper sul- 

 phate solution be- 

 fore the buds swell 

 in the spring, and 

 to follow this by re- 

 peated and copious 

 applications of the 

 Bordeaux mixture 

 at intervals of two 

 weeks until mid- 

 summer. A clear 

 fungicide may be necessary to avoid staining the fruit. Even 

 this treatment may not hold the disease in check. In that case 

 perhaps the best method to follow is to cut off all growth close 

 to the ground during the fall or spring, and then burn the canes. 

 This means the loss of one year's crop, but the source of infec- 

 tion would no doubt be so reduced that but little disease should 

 appear during the next few years, especially if the bushes are 

 also sprayed as above described. Or the entire plantation may 

 be pulled up and a new one, composed of less susceptible vari- 

 eties, may be set upon other land. 



Orange-rust; Red-rust (Cceoma luminatum, Link). Descrip- 

 tion. This fungus is found upon blackberries and raspberries. 



FIG. 85. Easpberry anthracnose, or cane rust. 



