citrus scab: its cause and COXTROL. 
2S 
Table 7. — Results of inoculations with the scab fungus on expanding leaves of grapefruit, 
'King and Satsunui oranges, tangerine, lemon, and tangelo. 
Size, 
width 
Per- 
of 
Total 
Drop- 
ped. 
Leaves 
Total 
Total 
cent- 
■ 
Date. 
leaves 
(in six- 
teenths 
of an 
inocu- 
lations. 
re- 
main- 
ing. 
posi- 
tive. 
nega- 
tive. 
age, 
posi- 
tive. 
Degree of infection . 
inch). 
Grapefruit: 
Mav 1. 1917 
( x ) 
50 
9 
41 
28 
13 
68 
Very severe. 
Hay 21, 1917... 
0) 
40 
5 
35 
26 
9 
74 
Feb. 3. 1919.... 
i 1 ) 
16 

16 
16 

100 
Do.' 
Feb. 19, 1919... 
« 
4 
3 
1 

1 

Feb. 20, 1919... 
CO 
5 

5 
5 

100 
Do. 
Do 
0) 
C 1 ) 
5 
4 
4 
1 
1 
3 
J 


100 
100 
Do. 
Do. 
Do 
Feb. 28, 1919... 
C 1 ) 
11 

11 
8 
3 
73 
Very severe; 16 hours 
ex- 
Mar. 3, 1919. . . . 
C 1 ) 
15 
2 
13 
10 
3 
77 
posure . 
Very severe; 4 hours 
posure. 
e\- 
Do 
C 1 ) 
8 
4 
4 
3 
1 
75 
Very severe; 11 hours 
ex- 
posure. 
Do 
C 1 ) 
7 
3 
4 
3 
1 
7.". 
Very severe; 6 hours 
ex- 
Apr. 18, 1919. . . 
( x ) 
10 

10 

10 

posure. 
Royal grapefruit. 
Apr. 22, 1919... 
w 
20 
4 
16 
8 
8 
50 
Severe. 
Apr. 29, 1919... 
0) 
13 

13 
13 

100 
Do. 
Do 
C 1 ) 
7 
1 
6 
5 
1 
84 
Do. 
Do 
0) 
18 
2 
16 

16 

Royal grapefruit. 
Severe. 
Apr. 2, 1920 
C 1 ) 
36 
5 
31 
23 
8 
74 
Apr. 5, 1920 
( x ) 
36 
5 
31 
23 
B 
74 
Do. 
Apr. 6, 1920 
Mar. 8. 1919 
C 1 ) 
20 
1 
19 
1.-) 
4 
79 
Do. 
4 to 64 
12 
3 
9 
3 
6 
33 
16 hours exposure. 
Mar. 12,9919... 
6 to 2i) 
L5 

15 

15 
(i 
Mar. 13, 1919 . . . 
8 to 16 
14 

14 

14 
(i 
Apr. 14, 1920... 
8 
39 

39 

39 
(i 
Apr. 10, 1920... 
Mar. s, 1919.... 
8 to 10 
23 

23 

23 

8 to 48 
9 
5 
4 

4 

Do. 
Apr. 10, 1920... 
Mar. 12, 1919... 
8 to 16 
20 

20 

20 

Royal grapefruit. 
8 to 20 
10 

10 

10 

Apr. 16, 1920... 
12 
32 

32 

32 

King orange: 
Feb. 28, 1920... 
C 1 ) 
10 

10 
9 
1 
90 
Severe. 
Apr. 5, 1920.... 
( x ) 
50 

50 
10 
40 
20 
Moderate. 
pr. 20, 1920... 
4 to 8 
61 
7 
54 

54 

Apr. 16, 1920... 
8 
50 
10 
40 

40 

Satsuma orange: 
Mar. 26, 1919... 
C 1 ) 
30 
4 
26 
21 
5 
81 
Do. 
Mar. 12, 1919... 
C 1 ) 
9 

9 
7 
2 
78 
Do. 
Mar. 19, 1919... 
8 
20 
5 
15 

15 

Mar. 13, 1919... 
8 
4 

4 

4 

Mar. 12, 1919... 
8 to 24 
8 

8 

8 

Tangerine: 
Mar. 3, 1919.... 
C 1 ) 
5 
1 
4 
4 

100 
Do. 
Apr. 10, 1920... 
Mar. 12, 1919... 
8 
14 

14 

14 

8 to 16 
16 

16 

16 

Lemon: 
Feb. 19, 1919... 
C 1 ) 
12 
4 
8 
8 

100 
Very severe. 
Do 
C 1 ) 
7 
3 
4 
4 

100 
Feb. 28, 1919... 
( x ) 
4 

4 
4 

100 
16 hours exposure. 
Mar. 1,1919.... 
C 1 ) 
4 

4 
4 

100 
Very severe. 
Do 
C 1 ) 
2 

2 
2 

100 
Severe. 
Mar. 3, 1920 
0) 
2 

2 
2 

100 
Do. 
Do 
( x ) 
3 
2 
1 
1 

100 
Do. 
Apr. 5, 1920 
C 1 ) 
5 

5 
4 
1 
80 
Moderate. 
Apr. 10, 1920... 
4 to 8 
17 
2 
15 
1 
14 
7 
Very slight 
Apr. 15, 1920... 
Mar. 12, 1920... 
8 to 12 
24 
4 
20 

20 

8 to 16 
12 

12 

12 

Mar. 20, 1920... 
12 
20 
2 
18 

18 

Tangelo: 
Jan. 31, 1919.... 
t 1 ) 
4 
2 
2 
2 

100 
Very severe. 
Mar. 3, 1919 
C 1 ) 
25 
5 
20 
20 

100 
Feb. 28, 1919... 
C 1 ) 
10 

10 
10 

100 
Do! 
Feb. 3, 1919.... 
0) 
16 

16 
16 

100 
Do. 
June 2, 1920.... 
C 1 ) 
20 
5 
15 
12 
3 
80 
Moderate. 
June 7, 1920 
4 to 8 
25 
2 
23 

23 

Mar. 12, 1919... 
6 to 16 
15 

15 

15 

Apr. 10, 1920... 
8 to 16 
19 

19 

19 

Apr. 16, 1920... 
12 
30 
4 
26 

26 

1 Expanding. 
