156 BOTANICAL GAZETTE [FEBRUARY 
and others. In an earlier report® the symptoms of the yellows disease of 
ca 
ment of large areas of fertile soil for cabbage culture. Soil disinfection having 
proved ineffective or impracticable, the only hope for control lies in the selec- 
tion of disease resistant strains. Selections have been continued since 1910 
with very effective results. 
The success of this work rests largely on the fact that the cabbage is 
nearly self-sterile and is normally cross-pollinated. As a result all standard 
of such heads for seed growing the next season, and saving the seed from 
each ee separately, individual head strains were secured which were planted 
on badly infected soil the second season. Thus by continual selection and 
teats of weaklings, high resistant strains were quite readily secure 
Wisconsin. A highly resistant strain of this variety was secured to which the 
name Wisconsin Hollander has been given. The latter differs slightly from the 
purposes of distinction the former strain is now designated as Late Wisconsin 
Hollander and the latter as Early Wisconsin Hollander 
Following similar methods, selections from two as summer varieties of 
the flat head type, the All Seasons and the Brunswick, have yielded highly 
resistant strains of each. These new strains are known as the Wisconsin All 
Seasons and Wisconsin Brunswick. To meet further demands of the trade, 
selections are now under way on three still earlier maturing varieties, the All 
Head Early, the Glory of Enkhuizen, and the Copenhagen Market. 
In general, throughout this work, a number of closely similar seed heads 
from the same source were grown in mixed plantation to insure sufficient 
setting of seed. The seed from individual plants was then saved separately 
and tried out in head to row tests. In certain cases, however, attention was 
wJones, L. R., and Gran, J. C., The control of cabbage yellows through 
i resistance. Wis. Agric. Exp. Sta. Res. Bull. 38. 1-70. figs. 23. 1915. 
