74 
FLORIDA STATE HORTICULTURAL SOCIETY 
Block 2 of ten trees was sprayed twice 
during the season with 3-3-50 Bordeaux. 
The first application was made on March 
23 into the bloom and the second applica¬ 
tion on April 21. Six per cent of scab in¬ 
fected fruits were found on the trees in 
this block when the fruits were examined 
in August. 
Block 3 of ten trees was sprayed three 
times. The first application was made 
on March 23 into the bloom and a second 
application on April 21. 3-3-50 Bor¬ 
deaux was used in these two applications. 
A third application of 4-4-50 Bordeaux 
was made on May 21. The fruits on this 
. block showed 9% of scab infection. 
Block 4 of 15 trees received four spray¬ 
ings during the season. The first two ap¬ 
plications were made with 3-3-50 Bor¬ 
deaux Mixture and the 4-4-50 formula 
was applied in the last two applications. 
The trees were sprayed first into the 
bloom March 23. A second spraying was 
made April 21, a third on May 21 and the 
fourth on June 22. Four per cent of 
scab infected fruits were noted on the 
trees in this block. 
Block 5 of five trees was sprayed three 
times. The first application was made on 
April 21, after the bloom had disappeared 
and the fruit had set. The second appli¬ 
cation was made May 21 and the third on 
June 22. 3-3-50 Bordeaux was applied 
in the first spraying and the 4-4-50 form¬ 
ula in the last two. Nine per cent of scab 
infected fruits were found on this block. 
Through a mistake four of the five trees 
in this block were sprayed into the bloom 
during the March spraying and this prob¬ 
ably accounts for the low percentage of 
scab noted. 
Block 6 of five trees was sprayed twice. 
An application of 3-3-50 Bordeaux was 
made on April 21, after the fruit had set. 
A second spraying was made on May 21 
with 4-4-50 Bordeaux. Twenty per cent 
of the fruit on the trees in this block 
showed scab infections. 
Block 7 of five trees was sprayed once. 
An application of 3-3-50 Bordeaux was 
made on April 21. Sixty-three per cent 
of the fruit on the trees in this block 
showed scab infections. 
Block 8 of 12 trees was reseryed as a 
check and received no spraying during 
the season. Ninety-two per cent of the 
fruit on these trees were affected with 
scab and in a majority of cases the fruit 
was badly affected. 
With the exception of block 7 all of 
the sprayings made in this experiment 
materially reduced the percentage of scab. 
I believe, however, that a convenient and 
effective spray schedule can be made up 
for the control of Avocado scab which 
need not include more than three applica¬ 
tions of Bordeaux. The bloom spray 
seems to be essential and should not be 
omitted. In making such a schedule I 
would suggest that the first application 
be made into the bloom during the latter 
part of the bloom period. A second ap¬ 
plication should follow in three weeks to 
one month later and a third application in 
three weeks after the second. The 3-3-50 
Bordeaux will be of sufficient strength to 
control attacks of scab on the fruit. 
