Nov. 1, 1924 
Alternaria Leaf spot of Cauliflower 
439 
Table I .—Amount of brownrot found by inspectors of the Bureau of Agricultural 
Economics on cauliflower in various shipments 
Date 
Source 
Dec. 12, 1920. 
Mar. 23, 1920. 
Feb. 13, 1920. 
Feb. 7, 1920.. 
Jan. 1, 1920.. 
Feb. 6, 1920.. 
Mar. 22, 1919. 
Los Angeles, Calif... 
_do.. 
_do_ 
_do-- 
Compton, Calif. 
Bradentown, Fla_ 
San Francisco, Calif. 
Market 
j Percentage 
of heads 
j affected 
Chicago, Ill__ 
Fort Worth, Tex_ 
Chicago, Ill_ 
_do__ 
; 
3-5 
50-100 
20-30 
100 
_do.._ _i 
0-20 
_do__1 
80 
New York, N. Y_; 
10 
Table II .—Detailed data on experiments conducted to prove the pathogenicity of 
A. brassicae isolated from different types of lesions on different hosts and from 
different sources 
Num¬ 
ber of 
organ¬ 
ism 
Source of organism 
Date of 
inocu¬ 
lation 
Host 
Part of 
plant used 
Num¬ 
ber of 
plants 
inocu¬ 
lated 
Num¬ 
ber of 
plants 
in¬ 
fected 
Num¬ 
ber of 
con¬ 
trols 
Num¬ 
ber of 
con¬ 
trols 
in¬ 
fected 
1921 
4746c 
Cauliflower curd, Wash¬ 
ington, D. C., cit y market. 
Jan. 8 
Cauliflower. 
Curd_ 
2 
2 
1 
0 
4829 
Pure line of 4746c 
Mar. 12 
__ .do _ 
__ ..do. 
2 
2 
1 
0 
4829 
_do_ 
__do. 
Cabbage_ 
Cauliflower. 
Head.... 
2 
2 
1 
0 
4829 
_do... 
Mar. 14 
Seedlings_ 
(°) 
(*) 
( c ) 
0 
4829 
_do... 
Mar. 31 
_do_ 
_do_ ._ 
( d ) 
( 6 ) 
(•) 
0 
4829 
_do___ 
...do_ 
_do_ 
Half-grown 
3 
3 
1 
0 
plants. 
4829 
_do_ 
...do_ 
Cabbage- 
-do.. 
3 
3 
2 
0 
4829 
_do... 
Apr. 4 
...do_ 
Cauliflower. 
Curd_ 
1 
1 
1 
0 
4828 
Cauliflower leaf, California. 
_do_ 
_do. 
1 
1 
1 
0 
4866a 
Cauliflower curd, California. 
...do_ 
_do. 
_do_ 
1 
0 
1 
0 
4829 
Pure line of 4746c. 
June 2 
_do... 
Plants in field, 
7 
7 
7 
0 
curd. 
4828 
Cauliflower leaf, California. 
June 18 
_do_ 
_do_ 
5 
5 
5 
0 
4829 
Pure line of 4746c_ 
...do..... 
_do.. 
.do_ 
10 
10 
5 
0 
4829 
_do.__ 
...do. 
_do. 
_do_ 
8 
8 
6 
0 
4828 
Cauliflower leaf, California. 
...do_ 
Cabbage_ 
Plants in field. 
5 
5 
6 
0 
4829 
Pure line of 4746c 
July 4 
_do_ 
_do_ 
10 
10 
5 
0 
4828 
Cauliflower leaf, California. 
Pure line of 4746c__ 
Nov. 10 
Cauliflower. 
Curd.. 
1 
1 
1 
0 
4829 
...do. 
.do.. 
_do_ 
1 
1 
1 
0 
4973d 
Cauliflower curd, Wash- 
...do_ 
_do_ 
_do.. 
1 
1 
1 
0 
ington, D. C. 
4866a 
Cauliflower curd,California. 
...do- 
_do_ 
.do_ 
1 
0 
1 
0 
6047 
Washington, D. C., city 
...do_ 
_do_ 
_do_ 
1 
1 
1 
0 
market. 
4997c 
Cabbage leaf, Arlington, 
...do_ 
_do_ 
_do_ 
1 
1 
1 
0 
Va. 
1922 
6104 
Cabbage from New York, 
Feb. 22 
_do_ 
Plant 1 foot 
2 
2 
2 
0 
in storage at Washing- 
D. C. 
Pure line of 4746c_ 
high. 
4829 
...do_ 
_do_ 
_do_ 
2 
2 
2 
0 
4997c 
Cabbage leaf, Arlington, 
...do- 
_do_ 
_.do_ 
2 
2 
2 
0 
Va. 
4828 
Cauliflower leaf, California. 
...do_ 
_do_ 
_do.... 
2 
2 
( e ) 
0 
4973d 
Cauliflower curd, Wash- 
...do_ 
_do_ 
_do_ 
2 
2 
C) 
0 
ington, D. C. 
(•) 
5093 
Cabbage leaf_ 
...do. 
-do- 
_do_ 
2 
2 
0 
5091 
Cauliflower curd, Florida__ 
...do_ 
_do_ 
_do_ 
2 
2 
C) 
0 
5095 
Cauliflower leaf; not typi- 
...do_ 
_do_ 
_do_ 
2 
0 
( e ) 
0 
cal Alternaria spot. 
« 
5089 
Cabbage leaf_ 
...do_ 
_do_ 
_do_ 
2 
0 
0 
4866a 
Cauliflower curd,California. 
...do_ 
_do_ 
_do_ 
2 
0 
« 
0 
« 2 pans. 
b Large number. 
c 1 pan. 
d 4 pans. 
* Same control as above. 
