72 
FLORIDA STATE HORTICULTURAL SOCIETY 
vided into groups of four trees each and 
each group was treated as a separate unit. 
Group i was sprayed four times dur¬ 
ing the season. The first application was 
made on March 23, spraying directly into 
the bloom. A second spraying was made 
April 21. The 3-3-50 Bordeaux Mixture 
was used in the first two sprayings. A 
third spraying was made on May 21, and 
a fourth on June 22, using the 4-4-50 
Bordeaux formula, in the last two appli¬ 
cations. The first part of August the 
fruits on these trees were examined and 
checked over for Black Spot and Blotch. 
Only 1.6% of the fruit from trees in this 
group showed slight attacks of these dis¬ 
eases. The infected fruits were found 
mainly in the tops of the trees and prob¬ 
ably were not thoroughly covered with 
the spray material. A striking illustra¬ 
tion of the effectiveness of Bordeaux 
Mixture in controlling these diseases was 
brought out by a single tree in this group. 
This tree had been observed for two or 
three seasons past and the fruit at ma¬ 
turity was always badly affected by 
Blotch and Black Spot. This season at 
the end of the experiment the tree was 
carefully examined and the fruits checked 
over, but not a single fruit was found that 
showed any indications of Black Spot or 
Blotch. The previous year fully 90% of 
the fruits on this tree were more or less 
spotted. 
Group 2 received three applications of 
Bordeaux Mixture during the season. 
The first two applications were made 
with 3-3-50 Bordeaux, and in the third 
the 4-4-50 formula was used. These 
trees were sprayed first in the bloom, 
March 23, again on April 21 and the last 
application was made on May 21. On the 
first of August when the fruits were ex¬ 
amined 5% were found to be slightly af¬ 
fected with Black Spot and Blotch. The 
slight increase in the percentage of in¬ 
fected fruits in this case over those in 
groups 1 and 3 is probably due to failure 
to thoroughly cover the fruits with the 
spray solution. 
Group 3 was sprayed only twice during 
the season with the 3-3-50 Bordeaux 
Mixture. The first application was made 
March 23 into the bloom, and the second 
on April 21; 1.2% of infected fruits were 
found on the trees in this group when the 
fruits were checked over the first of Au¬ 
gust. 
In the following three groups the 
bloom spray was omitted and the first ap¬ 
plication was made after the fruit had set 
and the bloom had all disappeared. 
Group 4 was sprayed three times dur¬ 
ing the season. The first application was 
made April 21, using 3-3-50 Bordeaux 
Mixture. A second application was made 
May 21 and a third on June 22. The 
4-4-50 Bordeaux Mixture was used in the 
last two applications; 2.6% of the fruit 
on these trees showed slight infections of 
Black Spot and Blotch on August 1st. 
Group 5 was sprayed twice during the 
season. First on April 21 with 3-3-50 
Bordeaux and again on May 21 with 4-4- 
50 Bordeaux Mixture; 2.6% of the fruit 
of these trees showed slight infections 
of Black Spot and Blotch. 
Group 6 was sprayed only once during 
the season. An application of 3-3-50 
Bordeaux Mixture was made on April 
