(Sullivan's) received no insecticides, Trichogramma spp, were 
released 14 times at rates of 4,000 to 8,000 per acre on about 
7-day intervals. In addition, chrysopid eggs were released one 
time in this field. 
Egg counts do not indicate a consistently lower oviposition 
rate in lighted fields (fig. 2). Certainly, the performance of 
one trapping system does not appear to be superior to another, 
However, the oviposition rates are confounded with applications 
of insecticides, In this area, either 4:2:1 toxaphene:DDT:methyl 
parathion or 3:1:3 toxaphene:DDT:methyl parathion usually was 
applied by airplane as an undiluted chemical at rates ranging 
from 2 to 4 quarts per acre. 
50 
Ww 
a} 
= 
= 40 
= 
3 | | 
LJ 
i | 
oO y 
= | | 
™~ 
no ¥ v 
oO 
(e) 
LJ 
x —— HOMEMADE 
N = US S15 
r| =e EH line 
=—-—— JUIN ENG ATED. 
10 20 Sil 10 20 3| 10 20 30 
JULY AUGUST SEPTEMBER 
Figure 2.--Oviposition records for H. zea from one un- 
trapped and three trapped cotton fields. 
Thus oviposition records taken at irregular intervals in 
trapped and untrapped fields failed to indicate that the trapping 
program consistently produced lower oviposition counts. In 
addition, no definite differences were detected in oviposition 
rates in fields where the three designs of traps were used. 
