April, ’20] McCOLLOCH: OVIPOSITION OF THE CORN EARWORM 
251 
VI, and in Table VII these data are summarized to show the number 
and location of the eggs with relation to the date of planting for the 
six years. 
Table VI— Summary of the Total Number of Eggs on Each Variety of Each Date of Planting 
at Manhattan, Kans., 1913-1918 
Date of Planting 
Variety 
April 15 
May 1 
May 15 
June 1 
June 15 
Total 
Boone County White 
29 
26 
48 
94 
504 
701 
Commercial White 
95 
43 
77 
189 
687 
1,091 
Kansas Sunflower 
77 
32 
29 
607 
510 
1,255 
Hildreth 
48 
42 
31 
418 
1,242 
1,781 
Total 
249 
143 
185 
1,308 
2,943 
4,828 
Table VII— Summary of the Number and Location of the Eggs with Relation to the Date of 
Planting, Manhattan, Kans., 1913-1918 
Date of 
Planting 
Leaf surface 
L T pper Lower 
Silk 
Husk 
Tassel 
Stalk 
Total 
April 15 
59 
10 
115 
10 
17 
38 
249 
May 1 
38 
14 
49 
3 
5 
34 
143 
May 15 
65 
20 
50 
3 
1 
46 
185 
June 1 
314 
83 
540 
75 
23 
273 
1,308 
June 15 
1,019 
253 
991 
64 
201 
415 
2,943 
It is obvious from the results thus presented that April 15 is too early 
from the standpoint of oviposition for all varieties, with the possible 
exception of Boone County White, and June 1 is too late. More eggs 
were laid on the plants planted April 15 than on those planted May 1, 
and in the case of Commercial White, Kansas Sunflower and Hil¬ 
dreth than on those planted May 15. A decided rise in the number of 
eggs on all varieties is seen in the plots of June 1 and June 15, and simi¬ 
lar results are noted for the important parts of the plant selected for 
oviposition, although they are not so pronounced. The relationship 
between the date of planting and oviposition is more clearly brought 
out in Table VIII which shows the frequency with which the lowest 
number of eggs were found for each variety with regard to time of 
planting. In the case of Boone County White, the fewest eggs were 
found on April 15 planting in three years of the six. In five years the 
lowest number of eggs on Commercial White were on the May 1 plant¬ 
ing, and in three years the same was true for Kansas Sunflower. On 
the other hand, the fewest eggs on Hildreth were on the planting of May 
15 in three years of the six. Summarizing the data for the four varie¬ 
ties during the six years, it is noted that in 12 instances out of a pos¬ 
sible 24, the fewest eggs have been found on the May 1 planting. May 
15 is second with six instances, April 15 is third, and in one case the 
lowest number was found on the June 1 plot. 
Table VIII —Frequency with Which the Lowest Number of Eggs Were Found on Each 
Variety With Regard to Date of Planting, Manhattan, Kans., 1913-1918 
Variety April 15 May 1 May 15 June 1 
Boone County White 3 2 1 
Commercial White 1 5 
Kansas Sunflower 3 2 1 
Hildreth 12 3 
Total 
12 
6 
1 
