94 
Journal of Agricultural Research 
Vol. XXXI, No. 1 
In both experiments the lines from parent ears with 8, 10, and 12 
rows had smaller percentages of plants affected than the lines from 
parent ears with 16, 18, and 20 rows. This was true for each of the 
deleterious characters considered, although the differences in plants 
affected with dead blotch and chlorophyl blotch were small. 
Table XI .—Data on the relation of number of kernel rows on parent ears to per - 
centages of plants having deleterious characters in selfed lines of Garrick grown 
at Rosslyn, Va., and Florence , S. C., a in 1921 
Deleterious characters 
Percentage of 
plants affected b 
Deleterious characters 
Percentage of 
plants affected b 
Parent 
ears hav¬ 
ing 8,10, 
and 12 
rows 
Parent 
ears hav¬ 
ing 16,18, 
and 20 
rows 
Parent 
ears hav¬ 
ing 8,10, 
and 12 
rows 
Parent 
ears hav¬ 
ing 16,18, 
and 20 
rows 
Florence, S. C.: 
Plaited and erect leaves... 
Entangled leaves_ 
Chlorophyl blotch. 
Dead blotch__ 
Red and yellow flame. 
Per cent 
39.99 
8.03 
13.17 
29.45 
.96 
Per cent 
54.46 
15.68 
13.37 
32.34 
16.66 
Florence, S. C—Continued. 
Barrenness... 
Rosslyn, Va.: 
Red and yellow flame_ 
Barrenness.. 
Per cent 
1.61 
1.89 
1.94 
Per cent 
6. ^7 
7.40 
8.70 
• The data at Florence, S. C., were obtained in cooperation with the Pee Dee Substation of the South 
Carolina Agricultural Experiment Station. 
b The total numbers of plants studied were 4,013 in South Carolina and 3,167 in Virginia. 
RELATION OF SMUT RESISTANCE TO NUMBER OF ROWS OF KERNELS 
The selfed lines in the Garrick variety were studied in 1922 5 to 
learn whether there was any evidence of resistance to smut. The 
studies were made at the Arlington Experiment Farm, Rosslyn, 
Va., on reclaimed land along the Potomac River where smut in¬ 
fection normally is high. The 138 ear rows that were studied repre¬ 
sented 13 of the original selfed lines started in 1917 which had sur- ^ 
vived six generations of selfing and selection. Some of the ear 
rows in 5 of the 13 original lines or families were entirely free 
from smut. Three of these five families had been selected during 
the first five generations of selfing for 12 or less rows on the ear. 
The percentages of ear rows free from smut in these families were 
33.3^ 36.4, ana 37.5. Two of the five families had been selected for 
14 or more .rows during the same period. The percentages of ear 
rows free from smut in these families were 5 and 25. The average 
percentage of smut-free ear rows in all of the lines from few-rowed 
parent ears was 12.2, and in all of the lines from many-rowed parent 
ears was 4.7. 
Studies of smut resistance were continued with the Garrick lines 
in 1923 and additional investigations were begun with Cuban Yellow, 
a flint variety from southern Florida, and with Boone County White. 
Inbred lines of Cuban Yellow that had been selfed for four genera¬ 
tions and lines of Boone County White that had been selfea three 
generations were used. In the selection of the lines in these varieties 
no attention had been given to the number of kernel rows on the ear. 
The experiments were conducted at the Arlington Experiment Farm, 
Rosslyn, Va. 
5 Notes on infection by smut and the artificial inoculations (referred to later) were made by W. H. 
Tisdale, Pathologist in Charge of Smut Investigations, Office of Cereal Investigations, Bureau of Plant 
Industry, United States Department of Agriculture, and his associates 
