Collecting Data 
As noted, oviposition and larval counts were made on 
alternate days in the two fields by locating the flagged sites 
and counting the eggs and larvae of H. zea on 10 plants per site. 
Results 
Seasonal counts of eggs and larvae of H,. zea in the trapped 
and untrapped fields are shown in figure 7. Arrows pointing 
toward the X coordinate and drawn in the same legend as the chart 
lines indicate insecticide application dates for the trapped and 
untrapped fields. These data indicate that oviposition in the 
trapped field was somewhat lower when egg counts were relatively 
low. However, when oviposition counts in general were increasing, 
the counts also increased in the trapped field, 
60 TREATMENT DATES 
50 
40 —+—_ UNEIGHTED,.EGG 
---e--- UNLIGHTED, LARVAE 
=—-o--— [POH he.D, LARVAE 
H. ZEA EGGS OR LARVAE/|OO TERMINALS 
Ww 
oO 
20 
10 
2 - 
Oe 25° 8" 301 <5 | [sae 20r sao, SO. harao 
JULY AUGUST SEPT. 
Figure 7,--Records of seasonal egg and larval counts 
made in an untrapped field and in a field in which 
the insect traps were arranged in concentric 
circles. 
13 
