Dec. 10, 1917 
Breeding Sweet Corn Resistant to the Corn Earworm 555 
also included one row of Oregon Evergreen (Pi29), a commercial variety 
of sweet corn, and a row of New Century Wonder (P125), a commercial 
soft variety on the market as a table com. The pedigrees of the pro¬ 
genies added to the 14 progenies that were repeated from 1915 are given 
in Table III. 
Table) III .—Ancestry of progenies added to the experiment in igi 6 
Nature of pollination in 1915. 
PI1119C1 
PI1123C1 
PI1125C1 
PI1125C2 
PI1127C1 
PI1128C1 
PJ1128C2 
PI1130C1 
PI1132 . . 
PI1133. . 
Ph.134. . 
Phi3S- ■ 
PI1136. . 
PI1137.. 
PI1138. . 
Phi 39 • • 
PI1140. . 
PI1141. . 
1916 designation of progeny. 
Pistillate parent. 
Plant No. 
Progeny. 
Staminate parent. 
Plant No. 
Progeny. 
3308 
3529 
3609 
3625 
37 l8 
3776 
3773 
3865 
3270 
333° 
3334 
3368 
3369 
3373 
3403 
3489 
3557 
3602 
Phi 19 
Phi 2 3 
Phi2$ 
Phi25 
Phi27 
Phi28 
Phi28 
PI1130 
Phn8 
Phi 19 
Phi 19 
Phl20 
Phl20 
Phi2o 
Phi2i 
Phl22 
Phi 24 
Phi2 5 
Self. 
3 S 2 3 
3603 
3617 
3706 
3773 
3754 
Self. 
33 23 
3601 
3286 
33 28 
3328 
21 
3328 
3320 
3523 
21 
Phi 23 
Phi 2 5 
PI1125 
Phi27 
Phi 28 
Phi28 
Phi 19 
Phi 25 
Phn8 
Phi 19 
Phi 19 
Hopi. 
Phi 19 
Phi 19 
Phi 23 
Hopi. 
The method of taking notes has already been described (p. 552). The 
same procedure was followed as in 1915, except that the number of days 
from silking to harvest and the degree of maturity were added. 
To make it possible to secure ears at approximately the same degree 
of maturity, the exact dates of the first pollen and the first appearance 
of silks were recorded on a tag attached to each plant. After a few pre¬ 
liminary experiments it was found that from 16 to 18 days after silking 
the ears were in prime eating condition. The attempt was made, there¬ 
fore, to harvest all ears within these dates. There was some deviation 
from this rule, but the results showed that these departures did not 
materially affect the damage. 
Table IV gives the mean values of the characters (first and second ears 
combined) for each of the progenies, with the probable errors of the 
determinations. As in 1915, the order of the progenies in the table is 
the same as that in which they were planted. 
The 14 original progenies, which are repetitions of the 1915 series, are 
marked with an asterisk. The 1915 ancestry of the new progenies is 
given in Table III, but to trace the ancestry back of 1915 reference may 
be made to Table I. 
