56 
FLORIDA STATE HORTICULTURAL SOCIETY. 
The experiments show several things 
of interest. The low mortality where 
the rosin oil was added to the distillate 
was due no doubt to the imperfect 
spraying. No injury was done to a 
single tree, even when two per cent, of 
oil was used. They also show that 
one and a half per cent of either petro¬ 
leum oil or the paraffine oils and two 
per cent, of distillate oil is sufficient. 
In the load where one-sixth of one per 
cent, of rosin oil was added, more 
leaves fell than from adjoining trees 
sprayed with the same material with 
the rosin oil left out. We do not think 
rosin oil should be added to the emul¬ 
sion. If it is added, it should be a very 
small amount; not more than a pint to 
the quantity of emulsion required for 
200 gallons of spray material. Formu¬ 
lae I and II did not loosen the sooty 
mold to any great extent, and neither 
did they have the stable qualities that 
were possessed by the paraffine oils. 
The paraffine oils loosened the sooty 
mold perfectly. It would appear that 
these emulsions, particularly the par¬ 
affine oil emulsions, answer all the re¬ 
quirements of a good insecticide for the 
control of the whitefly. 
In order to test these emulsions and 
several other insecticides on the young 
stages of the whitefly larvae we 
sprayed a small grove March 30 and 
31. The insects were mostly in the 
second larval or instar stage, and so 
far as I could determine all the eggs 
had hatched. The sooty mold was 
abundant. The materials were applied 
as during the winter, with a power 
sprayer at 175 pounds pressure. The 
examinations were made April 18, and 
the leaves selected for this purpose 
were those which were in such a posi¬ 
tion as to have been most liable to have 
been hit by the spray. 
The following is a summary of the 
results: 
RESULTS OF SPRAYING EXPERIMENTS ON THE YOUNG STAGES OF THE WHITEFLY. 
INSECTICIDE OR FORMULA. 
I Petroleum Fuel Oil, 240 Baume. 
II Distillate Oil, 300 Baume. 
III Diamond Paraffine, 28° Baume. 
Paraffine Oil . 
IV Junior Red Engine Oil, 250 Baume. 
Commercial Lime Sulphur No. 1. 
Commercial Lime Sulphur No. 2. 
Kerosene Emulsion (61 per cent, oil) 
IV Junior Red Engine Oil, 250 Baume.... 
With Nicotine Sulphate . 
IV Junior Red Engine Oil, 250 Baume. 
Strength Per 
Cent. 
Approximate 
Dilution. 
Number Trees 
Sprayed. 
Number Insect 
Examined. 
Per Cent. 
Killed. 
1 . 1 
1-50 
35 
4 U 
95-6 
1 -Z7V* 
24 
487 
99-4 
1 1 
| 
1-50 
36 
1 
874 
1 
99-8 
1 
1 
1-50 
34 
5401 
99-8 
1-50 
1-50 
25 1 
7891 
93 
1-50 
1-50 
221 
409! 
88 
2 1 
1-30 
22 
712I 
7 1 
14 of 1 
I-IOO 
1 7 
118 
84 
Nicotine 1-320 
1 
^ of 1 | 
I-IOO 
30 
1621 
97 
