i88 
Journal of Agricultural Research 
Vol. XXI, No. 3 
Table I *—Number of bacterial leaf spots on the leaves of sprayed and unsprayed celery 
plants 
Treatment (spray 
material applied). 
Number of spots on individual leaves, numbered from oldest to 
youngest— 
Total 
num¬ 
ber 
leaf 
spots 
on 
plant. 
Year. 
i 
3 
3 
4 
s 
6 
7 
8 
9 
10 
11 
12 
Control. 
08 
04 
*7 A 
62 
63 
<1 
10 
O 
O 
0 
A r 2 
Bordeaux. 
2 
I 
/ *r 
7 
0 
O 
0 
0 
0 
O 
O 
0 
6 
pis 
Control. 
*95 
77 
0 
17 
16 
42 
0 
O 
O 
O 
0 
347 
Control. 
42 < 
82 
144 
60 
36 
0 
O 
O 
O 
0 
n An 
] 
Bordeaux. 
64 
18 
I 
c 
0 
0 
O 
O 
O 
0 
/ 47 
88 
[1915 
Control. 
475 
250 
73 
D 
93 
32 
38 
O 
O 
O 
0 
0 
.... 
961 
Control. ..._ 
147 
117 
48 
32 
2 K 
13 
4 
O 
O 
0 
386 
1 
Bordeaux. 
6 
5 
O 
O 
J 
O 
0 
O 
O 
O 
O 
0 
0 
II 
[ I 9 I 5 
Control. 
233 
i 43 
109 
30 
64 
O 
O 
O 
579 
Control. 
68 
65 
4 i 
23 
46 
l6 
4 
0 
O 
0 
0 
0 
263 
Lime-sulphur... 
56 
54 
S6 
38 
18 
II 
13 
O 
O 
0 
0 
246 
Control. 
58 
62 
32 
35 
!3 
2 
0 
O 
O 
0 
0 
, , , , 
202 
>1016 
Bordeaux. 
0 
0 
O 
0 
O 
O 
0 
O 
O 
0 
0 
0 
Control. 
83 
13 
27 
64 
12 
6 
15 
O 
O 
0 
0 
220 
Lime-sulphur... 
33 
70 
72 
82 
77 
39 
32 
3 
O 
0 
0 
0 
408 
I 
Control. 
29 
21 
44 
81 
66 
42 
*5 
16 
O 
0 
0 
0 
3*4 
>1916 
Bordeaux. 
1 
5 
0 
0 
0 
0 
0 
0 
O 
0 
0 
6 
Lime-sulphur... 
90 
96 
5 i 
48 
15 
20 
56 
4 
4 
0 
0 
0 
384 
| 
Control. 
Bordeaux...... 
86 
1 
100 
0 
145 
0 
95 
0 
150 
2 
96 
0 
66 
0 
29 
0 
16 
0 
10 
0 
0 
0 
0 
0 
793 
3 
U917 
SUMMARY 
Pseudomonas apii , n. sp., is the cause of a leafspot disease of celery in 
New York and Michigan. The disease is controlled by spraying with 
Bordeaux mixture. 
