PEACTIC ABILITY OF INCREASING EFFICACY OF FUNGI. 
65 
fragments with the red-fungus spores, but no results worth noting 
were secured. 
Series A was sprayed 11 times between May 7 and October 19, 
using from 300 to 600 pustules per gallon of water. 1 The applications 
were made on the following dates: May 7, May 26, June 25, July 24, 
August 27, September 11, September 18, September 25, October 2, 
October 9, October 19. 
Series B was sprayed only once, May 7. 
Eight examinations, each based upon 300 leaves picked promis- 
cuously from the trees of each series, gave the records shown in 
Table XII. 
Table XII. — Average number of red-fungus -pustules 
per leaf at successive 
examinations. 
When examined (1909). 
June 10. 
June 30. 
Jub/9. 
July 24. 
Aug. 14. 
Aug. 27. 
Sept.ll. 
Oct. 26. 
0.22 
.15 
0.5 
.3 
1.2 
.5 
3.5 
.8 
5.1 
2.4 
10.1 
6.0 
20.1 
8.8 
21.5 
Series B, sprayed once 
9.5 
A check lot of leaves picked promiscuously from unsprayed trees 
within three rows of the experimental block showed an average of two 
red-fungus pustules per leaf on October 26. 
The rainfall and the comparative humidity 2 for each week during 
the six months covered by the sprayings are shown by the data in 
Table XIII, being based upon the mean of the maximum and minimum 
relative humidity records for each day by a Friez recording hygro- 
graph located at the standard Weather Bureau shelter near the 
Orlando laboratory. 
Table XIII. — Rainfall andrelative humidity records, Orlando, Fla., May to October, 1909. 
Week beginning- 
May 3. 
10. 
17. 
24. 
31. 
Monthly mean. 
June 7. 
14. 
21. 
28. 
Monthly mean. 
July 5. 
12. 
19. 
26. 
Monthly mean. 
Daily i 
mean j 
humidity. 1 
Weekly 
rainfall. 
Per cent. 
76 
82 
78 
80 
77 
Indies. 
.58 
.0 
1.83 
.0 
2.01 
78.6 ! 
S3 i 
.05 
77 
.0 
76 
.59 
77 
8.23 
78.2 
91 
1.03 
86 
2.34 
81 
.0 
80 
1.59 
84.5 1 
Week beginning — 
August 2. 
9. 
16. 
23. 
30. 
Monthly mean . 
September 6. 
13. 
20. 
27. 
Monthly mean. 
October 5. 
12. 
19. 
26. 
Monthly mean. 
Daily 
mean 
humidity. 
Per cent. 
83 
84.5 
Weekly 
rainfall. 
87 
79 
Inches. 
3.39 
2.76 
.57 
.73 
.77 
1.65 
.0 
. 92 
As in all experiments, unless otherwise stated, the freshest fungous pustules obtainable, according to the 
of the year, were used. 
2 These humidity records are not comparable to U. S. Weather Bureau records, which in Florida are 
taken at 7 a. m. and 7 p. m. 
21958°— Bull. 102—12 5 
