BORDEAVX-OIL EMULSION. 
17 
An examination was made on November 27 to determine the 
effect of the various strengths of Bordeaux-oil emulsion on the 
development of the entomogenous fungi. Fifty leaves were counted 
for each plat. The average per leaf is shown in Table 9. 
Table 9. — Effects of Bordeaux-oil emulsion on the development of entomogenous fungi, 
the white fly, and the purple scale in 
Number 
of appli- 
cations. 
Date of applications. 
Pustules per leaf. 
Number per leaf. 
Spray material. 
Brown 
fungus. 
Red 
fungus. 
Scale 
fungus. 
White- 
fly 
pupae. 
Adult 
female 
purple 
scales. 
1-1-50 plus 1 per 
cent of oil 
( i 
1 i 
Apr. 11 
Apr. 11, May 11, May 22 
Apr. 11 
0.66 




.26 
0.26 

.12 


.9 
0.42 

.5 


.32 
3 
2.5 
6.72 
.7 
.52 
2.2 
2.24 
.IS 
.42 
3-3-50 plus 1 per 
cerrt of oil 
Check 
Apr. U, May 11, May 22 
May 10, June 10, July 10 
.6 
.26 
.06 
One application of 1-1-50 Bordeaux mixture plus 1 per cent of oil 
made on April 1 1 did not prevent the development of the entomoge- 
nous fungi. 'Where three applications were given, these fungi were 
practically eliminated. The stronger applications likewise pre- 
vented their development. Xo doubt this result was in a large meas- 
ure due to the effect of the insecticide in killing the insects upon which 
the fungi develop. 
Although scales were not present in sufficient numbers to cause any 
apprehension, it was considered good orchard practice to spray all the 
plats during the last week in June with an emulsion made of heavy 
,oil. Up to December 27, 1922, no damage from scales had resulted. 
The white fly, Dialeurodes citri Ashmead, was not present in sufficient 
numbers to cause any damage. 
The rust mites were present in considerable abundance on July 2, 
when all the plats were dusted with commercial flowers of sulphur. 
This single dusting held the mites in check until the last of August, 
when they were again present in great abundance. The plats were 
again dusted on September 2, and few mites were found up to De- 
cember 27. 
GROVE B, ORLANDO, FLA. 
1920 TREATMENTS. 
The citrus trees on the laboratory grounds were used for spraying 
purposes in 1920. Practically all of these trees received tw^o applica- 
tions, the first being made on March 25 and the second on May 11. 
Examinations were made on September 10 and December 8 to deter- 
mine the effect of these materials on the entomogenous fungi, the 
white fly, and scales, and the results are combined in Table 10, which 
shows the average per leaf of 75 leaves per plat. All of the plats re- 
ceiving the Bordeaux-oil emulsion except one were sprayed on August 
27 for the purple scale. This single application of oil with the aid of 
entomogenous fungi controlled the scale satisfactorily. Only the un- 
sprayed check plats and those receiving the oil emulsion did not re- 
quire this special application of oil emulsion. 
