146 
FLORIDA STATE HORTICULTURAL SOCIETY 
dant and the injury resulting from them 
more pronounced following applications 
of Bordeaux mixture than is the case 
where no sprays are used. 
With this information at hand it was 
deemed advisable to determine whether 
or not Bordeaux mixture could be com¬ 
bined successfully with the present day 
oil emulsions and applied without injury 
on citrus trees and fruits at various stages 
of growth. Accordingly, a series of lab¬ 
oratory tests were commenced during the 
early fall of 1917 with the view of com¬ 
bining these two sprays. It was found 
that any dilution of the various oil emul¬ 
sions combined readily with any strength 
of Bordeaux likely to be. used and showed 
no detrimental effects upon either the 
Bordeaux mixture or oil emulsion. The 
first field test of this combination spray 
was made during the late fall of 1917 on 
a large, bearing citrus grove near Orlan¬ 
do, Florida. 
The Bordeaux mixture was prepared 
in the usual manner, using three pounds 
of bluestone and four pounds of lime for 
each fifty gallons, and the oil emulsion 
was added afterwards to the spray solu¬ 
tion with the agitator running. Both 
“cold stirred” (1) and “boiled” (1) 
emulsions were used, each in quantities 
that would give one-half per cent and 
one per cent of oil in the diluted material. 
Three applications were made at intervals 
of two weeks. 
i 
(1) Farmer’s Bulletin 933, U. S. Department of 
Agriculture, Washington, D. C. “Spraying for the 
Control of Insects and Mites Attacking Citrus 
Trees in Florida.” 
! - f" ~ . . i ; 
i ' • i I 
U ' I. 
During the scab spraying seasons of 
191 8 and 1919 this combination spray 
was given rather thorough trials in bear- 
ing groves at various points in the State. 
During the execution of this work trees 
were sprayed at all stages of growth; on 
the tender flush, in the bloom and at in¬ 
tervals thereafter, but no one grove was 
sprayed more than three times with this 
Bordeaux-oil emulsion combination. Both 
the “cold stirred” and “boiled” emulsions 
were used in these tests. 
In addition to these a more critical 
test was made in the experimental nur¬ 
sery at Orlando on seedling grapefruit, 
rough lemon, and sour orange nursery 
stock. A part of this nursery was spray¬ 
ed with 3-4-50 Bordeaux mixture and an¬ 
other part with Bordeaux oil emulsion 
(3-4-50 Bordeaux plus one-half per cent 
oil emulsion.) The applications were 
made at weekly intervals beginning in 
March and ending in October, 1919. Us¬ 
ually the ordinary “boiled” emulsion was 
used, but occasionally the proprietary 
emulsions, such as Schnarr’s Spray For¬ 
mula” and “Fico 60” were substituted. 
All of these emulsions served equally 
well. 
Again in 1920 extensive experiments 
to prevent citrus scab were carried on in 
several sections of the State. Tests were 
conducted on both nursery trees and bear¬ 
ing groves. At Orlando a nursery con¬ 
sisting of sour orange, rough lemon, and 
grapefruit seedlings was sprayed twice 
a month from April until October with 
various strengths of Bordeaux combined 
with emulsion at the. rate of one-half per 
cent oil in the diluted material. The sul¬ 
phur sprays, such as Dry Lime Sulphur, 
Barium Tetri Sulphide, and Lime Sul¬ 
phur Solution, used on the basis of equal 
