DEVELOPMENT OF WILT-HESISTANT TOMATOES. 
fore was not fully measured in the Bed Majestic and the Enormous 
by the percentage of dead plants. It was more closely related to the 
appearance of the crop and quantity of fruit produced. The per- 
centage of dead plants in the other varieties corresponded fairly 
closely with the degree of infection. 
Table 1. — Comparative susceptibility to wilt of different varieties of tomatoes 
when grown on uniformly wilt-infested., soil at the Arlington Experimental 
Farm, Va., in 1915, 1918, and 1919. 
[1= infected; K--= killed.] 
Comparative susceptibility. 
Variety. 
Field 1. 
Field 2. 
Field 3. 
1915 
1918 
1919 
1918 
1919 
1918 
1919 
I 
K 
I 
K 
I 
K 
I 
K 
I 
K 
I 
K 
I 
K 
Louisiana Wilt-Resistant 
P.ct. 
87 
92 
92 
98 
84 
100 
94 
92 
100 
100 
98 
99 
100 
100 
100 
100 
P.ct. 
1 
6 
6 
6 
8 
12 
16 
24 
24 
28 
34 
35 
38 
40 
44 
100 
P.ct. 
P.ct. 
P. ct. 
P.ct. 
P.ct. 
P.ct. 
P.ct. 
P.ct. 
P.ct. 
P.ct. 
P.ct. 
P.ct. 
Duke of York 
100 
63 
100 

Merveille des Marches 
100 
65 
100 
88 
Greater Baltimore 
100 
72 
94 
25 
68 
10 
69 
44 
Texas Bell 
Trophy 
Tres Hative de Pleine Terre . 
96 
57 
n 
72 
81 
44 
88 
31 
Willis 
2 
40 
43 
53 
75 
100 
100 
100 





25 
68 
94 
81 
97 
87 
89 

3 


40 

6 

25 

42 
60 


66 
67 

1*5 



19 
25 

35 

60 
75 

Mansfield Tree 
81 
91 
97 
94 
96 
100 
100 
100 
100 
100 



6 
4 
13 

38 
63 
69 
27 
75 
100 



100 
100 
100 
6 
31 
50 
100 
38 
Carter's Sunrise 7. 
56 


100 
75 
100 
100 
56 
81 
100 
100 
93 
81 
88 
89 
38 
Delaware Beauty 
41 
94 
75 
i 
100 
100 
88 
' 
100 94 
loo inn 
100 
94 
56 
Bonny Best 
94 
38 
In 1918 and 1919 the Marvel, Columbia, Norton, 3 and Arlington, 
wilt-resistant varieties developed by the writer, the Louisiana Red 
and Louisiana Pink, wilt-resistant varieties developed by Edger- 
a The Norton, as will be' explained later, was developed in cooperation with Mr. J. B. S. 
Norton, of the University of Maryland. 
