388 OHIO EXPERIMENT STATION: BULLETIN 214 
disease show on branches with smooth bark, by the presence of dead, discolored 
or sunken patches sometimes covered with the yellow orange or brown pustules 
of the fungus. 
CHRYSANTHEMUM 
Leaf-Spot is frequently a disfiguring disease of this plant in earlier growth. 
It is caused by the leaf-spot fungus (Septoria Chrysanthemi Cav.). Two other 
fungi, a Phyllostica and a Cylindrosporium, also attack the chrysanthemum. For 
indoor treatment copper sulfate solution of one fourth of the strength given in 
the spray calendar—that is one pound to 50 gallons of water—will prove avail- 
able. More applications will be required, but the foliage will not be rendered 
so unsightly as with Bordeaux mixture which, however, may be applied in full 
strength. 
Powdery Mildew. Powdery mildew also occurs upon chrysanthemum foliage. 
The fungus (Zrysiphe Cichoracearum DC.) is usually not persistent, but calls for 
spraying foliage with fungicides when serious. 
Ray Blight. A blight of the rays of chrysanthemum flowers due to a specific 
fungus (Ascochyta chrysanthemi Cav.) is reported from the south and is very 
: liable to be present 
in Ohio. 
Rust. This is found 
on the chrysanthe- 
mum, resembling 
other rusts in its’ 
development. Rusted 
leaves and _ badly 
rusted plants should 
be destroyed. 
CLOVER 
Anthracnose. Three 
anthracnoses occur 
upon clover; the 
more common of 
which is due to the 
same fungus (Colleto- 
crichum trifolii B. & 
E.) as the anthrac- 
nose of alfalfa, In 
1907 it -attacked the 
clover over the south- 
ern one-third to one- 
half of Ohio, causing 
dying of the plants 
attacked. These show 
lesions of the stems 
and leaf stalks and 
may be detected in 
the new seedings in 
late summer through 
Fig. 43. This shows clover plants from fields at the Station attacked 
by new anthracnose fungus in 1909. This causes the leaves to droop and a 
die; also at times the tips of the stems. From a photograph by T. F. the d ying of the 
Manns. leaves of these plants. 
It is not known how 
serious this may prove upon clover, nor is this one known in northern Ohio. 
The second anthracnose fungus (Glocosporium trifolit Peck.) has been 
known longer than the first and occasionally shows by killing the tops of large 
