252 Bush-Fruits 



States in the Agricultural Review for November, 1882, by T. J. 



Burrill, who referred to it as the raspberry cane-rust. 



The gray, discolored spots caused by this fungus are well known 



to all berry-growers. They are found on all parts of the plant, but 

 on the leaf are not easily distinguished from those of 

 some other fungi. They often become so numerous 

 that they destroy a large part of the living cane and 

 greatly weaken or even kill it. The disease seems to 

 be especially injurious just at ripening time. On red 

 raspberries its presence sometimes incites a warty 

 growth like that shown at Fig. 35. This growth itself 

 may be due to the work of other organisms, especially 

 crown gall bacteria. 



According to Washburn anthracnose behaves differ- 

 ently on different varieties in the Northwest, which 

 appears to be true elsewhere. He says that it is chiefly 

 confined to the leaves and stems of Cuthbert, while 

 only the leaves of Himalaya Giant are attacked. On 

 the stems of Snyder blackberry the spots reach three 

 or four times the size of a pinhead, are sunken and 

 often split when mature. They extend nearly through 

 the bark, run together, and form irregular patches 

 which may partially girdle the cane. On the leaves 

 the spots are only half the size of a pinhead, round, 

 white in the center and reddish-brown on the margins. 

 They often run together and the dead patches drop 

 out. But it is on the fruit that he finds the fungus 

 most injurious. It attacks the drupelets at the end 



Fig 35 An- and usuall y at the end of the ber] T- Several drupe- 

 thracnose in- lets in a cluster generally suffer. This may happen 

 citing knotty a t any stage of growth but usually when the fruit 

 raspberry. 16 is stil1 green. Few or many drupelets may be affected, 

 sometimes all at once, sometimes spreading from one 

 to another. The infected spot stops growing and turns a dull 

 reddish-brown. If attacked early it dries, if late it becomes 

 soft and easily crushed. The drupelets may partially mature 

 but the berry is deformed and unsalable. Lucretia dewberry 



