FLORIDA STATE HORTICULTURAL SOCIETY 
147 
amounts of sulphur in the diluted spray, 
were used along with the Bordeaux for 
comparison. Bearing trees were sprayed 
with 3-3-50 Bordeaux and one half per 
cent oil emulsion at intervals of one, two 
and four weeks during the. scab and mel- 
anose season. Both deep well and lake 
water were used in the spraiying. At 
Orlando and vicinity extensive experi¬ 
ments were carried on for the preven¬ 
tion of melanose and stem-end rot. 
While this work was in progress cer¬ 
tain rather interesting and important ob¬ 
servations were made which may be sum¬ 
marized as follows: 
All brands of commercial oil emulsions 
and miscible oils tested by us, and the 
government formulae “cold stirred” and 
“boiled” emulsions were found to com¬ 
bine readily with Bordeaux mixture. 
Bordeaux-oil emulsion settled less rap¬ 
idly and spread more evenly than plain 
Bordeaux. 
Bordeaux-oil emulsion adhered to the 
sprayed part's as well or better than plain 
Bordeaux. (2.) 
(2) Department Bulletin 785, U. S. Depart¬ 
ment of Agriculture, Washington, D. C. “The 
Field Testing of Copper-Spray Coatings” 
This combination was successfully 
made with shallow well and lake waters 
and with various types of untreated deep 
well waters except on two properties 
where slight injuries to tender foliage 
followed the failure to secure a perfect 
mixture. Even plain Bordeaux gave in¬ 
jurious results on these properties. These 
failures were undoubtedly due to unusual 
chemicals in the water. 
The presence of the oil neither increas¬ 
ed nor decreased the effectiveness of Bor¬ 
deaux against citrus scab. This combina¬ 
tion spray was very effective against mel¬ 
anose and indications are that it can be 
used with success against stem-end rot. 
The presence of the Bordeaux neither 
increased nor decreased the effectiveness 
of the oil against the various species of 
white flies and scale insects present. 
The. critical time for the application of 
the plain oil emulsion following the com¬ 
bination is during the last week in June 
when the second generation of purple 
scale have just hatched and are therefore 
more easily killed. 
More than 50,000 gallons of this com¬ 
bination have been applied on fruit, 
twigs, and foliage of all commercial va¬ 
rieties, at all stages of growth, including 
the full bloom period, during all weather 
conditions which permit of spraying op¬ 
erations, and no spray injury was ob¬ 
served on trees receiving the normal num¬ 
ber of applications except as noted above. 
Where the bloom spray was applied, oil 
emulsion was used at the rate of one-half 
per cent oil in diluted spray. At all other 
times the emulsion was used at the rate 
of one per cent oil in the spray which is 
the. regular strength for scales and white 
flies. It thus appears that oil emulsion 
combined with Bordeaux mixture has less 
tendency to injure tender growth than oil 
emulsion alone. 
Rust mites became much more abun¬ 
dant on trees sprayed with Bordeaux 
than on unsprayed trees. There was no 
appreciable difference in the number of 
rust mites following applications of Bor¬ 
deaux and following applications of Bor- 
12 
