]S[ew York Agricultural Experiment Station. 419 



The other insects mentioned as attacking the peach arc also 

 liable to trouble the apricot. 



BLACKBERKY AND DEWBERRY DISEASES. 



ANTIIRACNOSE. 



Blackberry anthracnose is caused by the fungus which affects 

 raspberries in a similar "way. For description and treatment, see 

 page 459. 



LEAF-SPOT. 



(Septoria ruhi Westd.) 



Description. — Blackberries, dewberries and raspberries are sul)- 

 ject to a leaf-spot disease caused by Septoria ruhi. The small, 

 pale spots of dead leaf-tissue finally become dotted with black 

 specks, the pycnidia of the fungus. In some seasons tlie foliage 

 is quite seriously injured by this disease. 



Treatment. — Goff^^ has tried treatment with Bordeaux mixture 

 and other fungicides, but the results were not encouraging. ISTo 

 successful line of treatment is known. 



RUST. 



Blackberry rust is caused by the same fungus which causes the 

 rust of raspberries. For description and treatment, sec page 460. 



BLACKBERRY AND DEWBERRY INSECTS. 



The principal injurious insects of blackberry and dewberry are 

 the cane borer and the saw fly. These also attack the raspberry. 

 They are discussed on pages 461, 462. 



CHERRY DISEASES. 



BLACK KNOT. 



It is claimed that the black knot of the cherry is caused by the 

 same fungus as that which causes the black kuot of the plum. If 

 it is uot the same fungus it certainly is so closely related that the 



l4Goff, E. S. Journ. Myc, 7: 22. 



