254 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 13 
the number of eggs on Hildreth has exceeded those on the other 
varieties. 
Table IX— Summary of the Location of the Eggs Found on the Different Varieties, Man¬ 
hattan, Kans., 1913-1918 1 
Variety Leaf surface 
Upper 
Lower 
Silk 
Husk 
Tassel 
Stalk 
Total 
Boone County White 
444 
74 
277 
48 
88 
158 
1,089 
Commercial White 
575 
146 
371 
23 
91 
301 
1,507 
Kansas Sunflower 
486 
210 
699 
75 
146 
301 
1,917 
Hildreth 
742 
215 
753 
36 
285 
323 
2,354 
1 Includes plots of July 1. 
There are many factors to be considered with relation to the oviposi- 
tion on the different varieties of corn which offer an extensive field for 
further investigation. In connection with the data just presented, it 
is of interest to note that there is an evident relation between the time 
of silking and maturing, and the number of eggs. Boone County 
White, which had the lowest number of eggs, is the earliest variety in 
point of silking and maturing. Kansas Sunflower is second in this 
respect, Commercial White third, and Hildreth last. Kansas Sun¬ 
flower, however, ranks third in the total number of eggs found on a 
variety in the six years, due to the fact that the plant in the-plot of 
June 1, 1914, produced three ears at intervals of several days, with the 
result that the plant was in silk for an exceptionally long time, and a 
large number of eggs were deposited on these later silks. In the work 
under discussion, several instances were noted where plants having 
rather smooth leaves had fewer eggs deposited on them than on plants 
having the leaves rough and hairy. Similar observations have been 
noted in the case of the stalk. The number of leaves borne by a plant 
and the leaf area are to be considered, since the number present may 
vary from 8 to 18, and there is a corresponding variation in the leaf 
area. The number of ears produced by a plant is also important, since 
a plant may have from one to four ears, each one silking at a little 
different time and consequently the plant is attractive to the moths for 
a longer period. Many other factors might be mentioned in connec¬ 
tion with the location of the eggs on the different varieties, but since, 
in the present work, the morphology of the plants has not been fol¬ 
lowed closely, it does not seem advisable to discuss them further. At 
the present time an investigation is being conducted along the lines 
suggested with a large number of varieties, and more extended informa¬ 
tion is being obtained from this work. 
Summary 
A study of the oviposition of the corn earworm on different varieties 
of corn plants with relation to the date of planting and period of silk¬ 
ing has been made during the past six years. This work represents 
