Aug. 1, 1925 
Susceptibility of Onions to Urocystis Oepulae 
277 
Table I. — Susceptibility test of varieties of Allium cepa 
Name of variety 
Source of seed 
Number 
of plants 
May 30 
Healthy 
plants 
Aug. 11 
Percent¬ 
age of 
infection 
American varieties: 
Australian Brown__ 
Livingston Seed Co__ 
195 
58 
70 
Bermuda Yellow_ ..._ 
F. H. Woodruff & Sons.. 
210 
33 
84 
Crystal white wax_ _ 
.do... 
177 
21 
88 
Early Barietta_ _ 
_do_ 
163 
39 
76 
Early Neapolitan Marzajola_ 
D. M. Ferry & Co.... 
0 
0 
Early Yellow Cracker. _J_ 
Fottler-Fiske-Rawson Co_ 
73 
2 
98 
Extra Early Red Flat.. 
F. H. Woodworth & Sons. 
176 
17 
90 
Extra Early Yellow ... _ __ _ 
_do_ 
152 
12 
92 
Giant White Italian Tripoli_ . 
D. M. Ferry & Co_ 
0 
0 
Isbell’s Early White Sugar Ball.. _.. 
S. M. Isbell & Co_ 
52 
0 
100 
Isbell’s Evergood Red Globe.. 
_do....... 
109 
10 
90 
Large Red Wethersfield__ _ 
F. H. Woodworth & Sons. ... 
95 
10 
89 
Mammoth Silver King. 
Livingston Seed Co_ 
78 
12 
84 
Ohio Yellow Globe_ 
F. H. Woodworth & Sons_ 
66 
5 
93 
Prizetaker_ _ 
_do_ 
136 
28 
78 
Red Italian Tripoli_ 
Fottler-Fiske-Rawson Co_ 
17 
3 
80 
Southport Red Globe_ 
F. II. Woodworth & Sons.. __ 
83 
15 
81 
Southport White Globe__ 
_do_ 
132 
14 
89 
Southport Yellow Globe_ 
_do.. 
182 
21 
88 
White* Adriatic Barletta_ 
Fottler-Fiske-Rawson Co_ 
56 
1 
98 
White Bunch__ __ 
Alexander Forbes & Co_ 
125 
26 
79 
White Portugal_ 
F. H. Woodworth & Sons. 
94 
5 
94 
Yellow Danvers Flat___ 
_do____ 
150 
20 
86 
Yellow Dutch or Strassburg __ 
_do. 
136 
12 
91 
Yellow Globe Danvers_T ..._ 
_do__ _ 
166 
9 
95 
European varieties: 
Blassrote hollandische... 
H. Zillig____ 
119 
10 
91 
Blut rote Ulmer_ .. .. 
_do."__ _ _ _. 
147 
36 
75 
Bornaer Riesen__ 
_do...- 
64 
10 
85 
Bronzekugel_ __ . _ 
_do__ 
0 7 
0 
100 
Braunschweiger schwarzrote_ 
_do__ 
15 
2 
86 
Calbenser Lokalsorte.... 
_do__ 
71 
22 
68 
Eisenkopf_ 
_do__ 
103 
17 
83 
Erfurter blassrote 
.do___ 
26 
4 
84 
Franzoschische Oder spanische weisse. 
Gelbe Birn_ _ _ 
_do_ 
155 
29 
81 
_do_... _ 
85 
18 
78 
Hollandische blutrote plattrunde 
harte. 
Hollandische gelbe plattrunde harte. _ 
.do____ 
119 
16 
87 
_do__ 
96 
10 
89 
Hollandische silberweisse plattrunde 
harte. 
Liegnitzer Lokal-Sorte_ 
_ do _ _ _ 
90 
6 
93 
_do__ 
145 
16 
88 
Runde gelbe Stuttgarter Riesen_ 
.do_ 
38 
6 
84 
Silberweisse Konigin 
_do__ 
116 
12 
89 
Silberweisse plattrunde fruhe_ 
_do__ 
127 
11 
91 
Strohgelbe (hellgelbe) plattrunde 
_do__ 
33 
1 
97 
Tripoli Rocca _T_ 
.do____ 
118 
17 
85 
Vertus 
_do__ 
58 
8 
86 
Weisse fruheste Fruhlings-Zwiebel_ 
_do_ __ 
163 
10 
93 
Zittauer Riesen— 
Blutrote runde __ 
.do___ 
18 
0 
100 
Gelbe runde__ __ 
__ __do__ 
7 
1 
85 
Scwefelgelbe _ 
_do_ 
112 
19 
83 
Silberweisse runde_ 
_do_ __ 
161 
20 
87 
‘Rlassrnt.p. plattrnndft harte Erfurter 
_do_ 
162 
4 
97 
Dunkelrote plattrunde harte Braun¬ 
schweiger. 
Grosse gelbe runde Zittauer Riesen... 
__ do_ 
191 
8 
96 
_do... 
125 
2 
98 
Hollandische gelbe _ 
.do.. 
110 
0 
100 
EXPERIMENTS WITH OTHER SPECIES OF ALLIUM 
During the last three years the writer has been attempting to 
determine the susceptibility of all species of Allium of which viable 
seed could be obtained. The seeds were planted in soil known to be 
heavily infested with the smut fungus and when the seedlings came 
up the percentage and severity of infection were recorded weekly 
until the plants were well grown and there seemed no more probability 
of new infections. Progress of the investigation has been slow on 
account of the difficulty of securing viable seed. Letters sent to the 
American seed houses and botanical gardens where one might expect 
