489 



Infested drupels on a well-matured fruit are of a dull reddish 

 brown color. As the drupels mature, the proportion of water in 

 the berry increases very greatly. If infection has taken place early 

 ^n the season while the drupels are small and do not contain much 

 water, they will remain firm and finally become dry. In case in- 

 fection takes place when the drupels contain a considerable amount 

 of water, however, they will crush very easily. Fortunately late 

 infection is rather rare, as far as our observations go. A greater 

 number of drupels on ripe fruit are dry enough so that they do 

 not injure the shipping quality of the fruit. When the drupels 

 become infested, the growth is only partially arrested. They con- 

 tinue to grow at the base and partially mature, but do not form a 

 salable berry. 



Kinds of Plants Attacked. Among the varieties of black- 

 berries, the Snyder, Kittatany and the Himalaya Giant are attacked. 

 The Lucretia dewberry is also susceptible, while the Logan berry 

 5s by no means free from the disease. Of the red raspberries, the 

 Antwerp is injured to a considerable degree, while the Cuthbert 

 is but slightly affected. The Cumberland black raspberry and the 

 Antwerp are equally affected. 



Conclusion and Recommendations. 



1. Anthracnose is caused by a small form of fungus. 



2. Distribution of the fungus is accomplished by the spores. 



3. Anthracnose attacks the Snyder, Kittatany and Himalaya 

 Giant blackberries; the Lucretia dewberry, Logan berry; Antwerp 

 and Cuthbert red raspberries, and the Cumberland black raspberry. 



4. The disease is very injurious to the Snyder and Kittatany 

 blackberries, attacking the stems, leaves and fruit. 



5. A macroscopic study and inoculation experiments show 

 that the same fungus" occurs in the spots on stems, leaves and 

 fruit. 



6. The fungus attacks the current year's growth of shoots, 

 when they are six inches to one foot in height and later. Spots 

 do not occur on the bases of these shoots. 



7. The disease does not spread on the stems and its leaves 

 after the branches form, since the canes and its leaves are infested, 

 while the laterals and their leaves are usually free from the dis- 

 ease. 



8. On the Snyder and Kittatany blackberries the fungus spreads 

 from the stems and leaves to the fruit as soon as the young fruit 

 forms. 



9. The disease continues to spread on the fruit during the 

 entire season. The fruit is damaged more or less severely, depending 

 on date of infection and the number of drupels on each berry that 

 becomes diseased. 



10. The fungus probably lives over winter in the berry field 

 in the leaves on the ground and in the canes. (Wash. E. S. B. 

 97.) 



Red Rust or Bramble Rust. This it? a well known <li^c;u<o of 

 the wild and cultivated blackberries, which al?o attacks raspberries. 



