206 Report of the Botanist of the 



believed to be the same species. As a rule, it is incon«picuous, 

 even when abundant and after the perithecia are formed. 



Other diseases. Fire blight {Bacillus amijlovonis) did con- 

 siderable damage, but less than usual. Ko specimen of rust 

 {Gymnosporan(jium) was taken. Hailstone bruises cause brown, 

 corky spots in the bark like those found on other fruit trees. 



EASPBERRY DISEASES. 



Axthracnose {Gl(£ospoyium venetiim Speg.). — It appears that 

 raspberry anthracnose gave very little trouble in 1900. Neither 

 the fruiting canes nor the new growth suffered much from its 

 attacks. 



Anthracnose is much more destructive to the black varieties 

 than to the red ones; in fact, it is quite unusual for it to do any 

 serious damage to red raspberries. 



During the past season we met with an interesting case in 

 which anthracnose was decidedly injurious to red laspberries of 

 the variety Cuthbert. However,the injury was of a very unusual 

 character. Knots of various sizes up to about two inches in 

 length made their appearance on the canes. The knots were 

 rough^ of spongy texture and often had a diameter twice as great 

 as that of the normal cane. (See Plate XXVI.) Our attention 

 was first called to them in November, 1899, and they puzzled us 

 exceedingly. The following spring we visited the affected plan- 

 tation and made a careful study of the knots without, however, 

 discovering their cause. The plantation was about one-half acre 

 in extent, and we estimated that 10 per ct. of the canes were 

 more ot less affected. 



It was evident that the knots were not 'caused by any insect, 

 and there seemed to be no fungus present except theanthracnose 

 fungus, which was not, then, suspected of being the cause of the 

 knots. Although the anthracnose fungus is well known it has 

 never "been held responsible for knots on the canes. Similar cane 

 knots are sometimes associated witb spongy galls on the roots 

 (orown gall disease), but in this case it was found that root knots 



