14 
Bulletin 69. 
ing any evidence of disease. Therefore cuttings should not be taken 
from a plantation in which this fungus has appeared. 
GRAPE ANTHRACNOSE. 
(.Sphaceloma ampelinum. De By.) 
During the month of June the grape vines in the College vine¬ 
yard were found to be seriously diseased with anthracnose as is 
shown in the illustration in Plate VII. Numerous dark colored pits 
or depressions occurred on the young canes and on the stems of the 
leaves and fruit clusters. Many of the spots grew into each other 
as the disease progressed, thus forming continuous depressions which 
in some cases nearly girdled the affected parts. The centers of the 
depressions also took on a whitish color, and finally very minute 
raised points or pustules appeared, in which the spores are born. 
The first effect seen on the leaf blade was in the form of fine, 
irregular cracks with brown edges. Later in the season the leaves 
presented a torn and ragged appearance where two or more cracks 
ran together. Leaves attacked when quite young were severely in¬ 
jured and their surface materially reduced, as shown in the plate. 
The characteristic appearance of diseased fruit is well shown in 
the illustration where one fruit is attacked and a seed exposed 
through a circular wound. The diseased berries do not decay, but 
the affected portions become hard and shrivelled. 
In Europe, as well as in many portions of the Eastern States, 
this fungus has proven difficult to combat. When once well estab¬ 
lished in a vineyard it has usually taken two or three years of most 
thorough treatment to get it under control. Fortunately, however, 
the disease does not spread rapidly. 
It is recommended that the vines be sprayed thoroughly with 
Bordeaux mixture, beginning early in the spring at the time when 
the buds are commencing to swell. This treatment should be fol¬ 
lowed bv four or five others made at intervals of about two weeks. 
PEA ROOT DISEASE. 
During the season of 1900 Mr. C. H. Potter, assistant in Horti¬ 
culture, gave considerable attention to a destructive pea disease 
which made its appearance in the vicinity of Longmont. The 
trouble was not generally distributed, but was confined to certain 
fields. In these fields where the disease was most severe a majority 
of the plants were killed before reaching the surface of the ground. 
Different fields presented all variations in the amount of injury, from 
partial to complete failures of the crop. 
The disease was not so destructive last season, as only a few 
