130 TWENTY-FIFTH ANNIVERSARY REPporRT. 
ened, shriveled margins. Apparently, the trouble was brought about. 
by bright sunlight following a period of foggy weather. Some 
farmers, fearing it might be a new disease, were much alarmed, 
but it proved to be unimportant. A brief account of it was pub- 
lished in one of the, Station bulletins.®? 
CELERY. 
The only extended investigation of celery diseases conducted by 
the Station was made in 1892 and the results published in Bulletin 
51.53 The purpose of this bulletin was “to give a brief description 
of some of these [celery] diseases, to state some of the results of 
investigations made under the direction of the Station in the sum- 
mer of 1892, and to collate such other information on the subject 
of celery diseases as may be deemed reliable and important to celery 
growers.” The subjects treated were center blight, stalk blight, 
Septoria leaf spot, Cercospora leaf spot, experiments on spraying 
and the danger from eating sprayed celery. 
It was discovered that the Septoria leaf spot attacks all parts 
of the plant above ground, including the seeds. Hence the disease 
may be transmitted with the seed and, consequently, spraying to be 
most effective should be commenced while the plants are in the 
seed bed. It was shown that celery seedlings may be safely sprayed 
with bordeaux. In the spraying experiment on celery in the field: 
there was not sufficient disease to warrant definite conclusions as 
to the value of the treatment. ‘ One of the most important results 
of the season’s work on celery diseases and their treatment is the 
establishment of the fact that the copper mixtures prepared and 
applied as recommended in this bulletin may be used in treating 
celery diseases with no fear of poisonous results.” Samples of 
sprayed celery, stripped and prepared as for market, were submitted 
to the chemist for analysis. The results showed that in order to 
secure a dangerous dose of copper by eating celery sprayed with 
bordeaux mixture, for example, one would need to eat 66,400 heads! 
CHERRY. 
Of the diseases affecting cherries, leaf spot and fruit rot have 
received most attention, although other less important diseases have 
not been entirely neglected. 
During 1891 and 1892 the United States Department of Agri- 
® Bul. 162:176 (1899); same in Rpt. 18:164. 
% Essentially the same in Rpt. 11:571-585 (1892). 
