582 Report o¥ THE HortIcuLTuRIST OF THE 
to the field. One plot was sprayed twice a week, two plots were ; 
sprayed once a week, and one plot was sprayed every two weeks. 
Treatment was continued till the first of July. During this time 
there were frequent rains, and celery made good growth and was — 
comparatively free from disease. The first specimens of the leaf 
spot, Septoria, were sent to the station, June eighteenth, at which 
time the disease was already attracting the attention of other 
celery growers. Although the disease was found scattered among 
the plants selected for experiment, it did so little damage even to 
untreated plants, that the contrast between,sprayed and unsprayed 
rows was seldom very marked. The spraying was not without 
effect in some cases, and the results seemed to indicate that: 
1. Semi-weekly treatment gave greatest freedom from disease. 
2. Potassium sulphide was less efficient than the ammoniacal 
solution of copper carbonate. 
3. Bordeaux mixture (used only for the first two applications) 
gave better results than similar treatment with potassium sulphide 
or ammoniacal solution of copper carbonate. 
In other parts of this field and in other localities later in the 
season the Septoria caused very serious loss. 
In this field the center blight did not become serious till the 
second week in August, after which it caused the loss of one-half 
the remaining early celery. 
At the suggestion of the Station Horticulturist, Mr. Curtis ates 
sprayed some late celery of the Giant Paschal variety and reported 
the results. It was sprayed first in the seed bed, about August 
first, with Bordeaux mixture containing three pounds copper 
sulphate, two pounds lime to twenty-two gallons water, and again 
after transplanting, about August fifteenth. The results are given | 
in Mr. Curtis own words: “I sprayed a portion of the seed bed in 
the field before the plants were taken from the bed. Afterwards 
sprayed the celery left ‘on the seed bed to mature, together with 
several rows transplanted from such seed bed. The effect. seems 
to have been good, as there was very little blight of any kind after 
the spraying. Mr. Treat, the farmer, thinks the spraying of this 
celery saved considerable portion of it, and it leads him to think ~ 
that the strongest Bordeaux mixture, using three pounds of sul- 
phate to twenty-two gallons of water was very beneficial, and 


