INSECTS OF THE BRAMBLES 205 



as small spots on the leaves. The central region of the 

 spots is white while the border is of a reddish color. This 

 disease is exceedingly common and widespread. No treat- 

 ment has yet been demonstrated to be of sufficient value to 

 be recommended. It is not often very serious. 



Anthracnose. — The anthracnose is a very serious disease 

 of both the blackberry and the raspberry. It has caused 

 great loss in several States. The disease attacks chiefly 

 the young canes, but is also found upon the leaves. The 

 disease appears as small purplish spots which later become 

 grayish white in the centers. As the spots increase in size, 

 they coalesce, making irregular blotches varying from | to 

 \ inch in length. The affected leaves refuse to grow and 

 finally dry up and fall off. The anthracnose is not very 

 destructive if rotation of crops is practised. In addition to 

 rotation, the infected canes should be cut out and burned. 

 Spraying with standard 4-4-50 Bordeaux mixture will aid 

 in preventing the spread of the disease. 



Cane Blight. — The cane blight is sometimes very injurious 

 in certain regions. The injury occurs to the fruiting canes, 

 the foliage of which wilts and dies. This disease often 

 enters the canes through slits made in pruning. The disease 

 is largely distributed through nursery stock and by work- 

 men. The cane blight should be prevented as much as 

 possible by planting only healthy plants and all diseased 

 canes should be immediately burned. It is never advisable 

 to replant on ground that has been previously infected. 



INSECTS OF THE BRAMBLES. 



Raspberry-cane Borer. — The raspberry-cane borer some- 

 times becomes troublesome. The adult insect is a beetle about 

 \ inch in length. It has a slender body which is black 

 in color except the prothorax, which is yellow. Occasion- 

 ally two or three black spots are found on the wings. The 

 beetles appear in the early summer and the females girdle 

 the young tip in two places, causing it to wither and die. 

 Between the two girdled portions the female deposits her 

 eggs, which soon hatch and the larvae burrow downward. 



