BORDEAUX-OIL EMULSION. 
15 
were 2,000 leaves examined for the sulphur sprays, 1,800 for the 
copper sprays, and 100 for the check. The results given show the 
average number of pustules of entomogenous fungi, living white-fly 
pupa?, and adult female purple scales per leaf. 
There is no very pronounced difference in the number of living 
insects or fungous pustules on the various sprayed plats. There is, 
however, an appreciate difference between the sprayed and un- 
sprayed plats. This difference is not as great as usual, owing no 
doubt to the combined effects of the insecticide in killing the white 
fly and scale insects as well as the effects of the Bordeaux mixture 
in preventing the development of the entomogenous fungi. The 
results show that Bortieaux-oil emulsion may be safely used when 
followed during the last week of June with straight oil emulsion. 
The results obtained from applications of copper sprays made 
primarily for the control of melanose in late April as compared with 
those made about May 20 and with others made about June 10 are 
shown in Table 6. The examinations were made August 22 and 
from November 28, 1921, to January 5, 1922. There were 300 
leaves examined on each date, and the results given are the average 
per leaf. 
Table 6. — Effect of copper sprays applied at different times on entomogenous fungi, 
the white fly, and the purple scale in 1921. 
Pustules per leaf. 
Number per leaf. 
Date of application. 
Brown 
fungus. 
Red 
fungus. 
Scale 
fungus. 
White-fly 
pupae. 
Adult 
female pur- 
ple scales. 
April 28 
12.7 
11.4 
5.8 
7.7 
9.45 
9.45 
1.84 
4.0 
2.84 
9.44 
11.4 
7.2 
0.55 
May 18 
.55 
.34 
No marked difference resulted from the applications made on the 
respective dates, which is doubtless owing in large measure to the 
fact that the spraying was done before the period of maximum 
activity of the entomogenous fungi and also to a most thorough 
spraying with oil emulsion in late June. 
Table 7. — Number of rust mites per square inch found on plats sprayed with sulphur 
compounds as compared with the number on those plats receiving copper sprays and 
the unsprayed check plat in 1921. 
Sulphur sprays. 
Copper 
sprays. 
Not sprayed (check). 
Date of count. 
Total. 
Average 
per square 
inch. 
Total. 
Average 
per square 
inch. 
Total. 
Average 
per square 
inch. 
May 2 


5 
4 
229 
3,883 



26 
375 
728 
17,600 
25,850 

.68 
2.84 
4.4 
53.2 
191. 48 
40 
39 
717 
2,459 
2,511 
269 
3.2 
May 17 
3 12 
June 2 
38.24 
June 21 
131 12 
July 8 
1.00 
25.88 
133 92 
August 11 
36 
Total 
4,121 
4.84 
44,579 
53.28 
6,035 
68 
