about 2,000 traps of four basic designs (Agri-Light F-1034, Agri- 
Light LS-15, Lethalite, and homemade) were located in a belt 12 
miles wide and 35 miles long, extending from 2 miles west and 
3 miles north of Pecos south to Balmorhea. Most of these traps 
were in operation from the time of preplanting irrigation until 
the first killing frost. Planned experiments were conducted near 
the center and on the extreme ends of the belt to determine the 
effectivensss of the traps in controlling lepidopterous insects. 
The results of these experiments and observations peculiar 
to this type of investigation are discussed in the paragraphs 
that, Foldiows. 
METHODS, MATERIALS, AND RESULTS 
Electric insect traps were sold to the farmers on the 
premise that H. zea oviposition in trapped fields would be 
reduced sufficiently to require fewer applications of insecti- 
cides. No claims of total control were made. 
Experiment 1 
Experiment 1 was a comparison among one untrapped and three 
trapped fields. Lethalite, Agri-Light LS-15, and homemade insect 
traps were installed on the periphery of the trapped fields. 
Design 
The experiment was conducted on the extreme northern end 
of the 12- by 35-mile, north-south belt of light traps. The 
primary objective was to compare oviposition counts taken at 
relatively frequent intervals throughout the season from trapped 
and untrapped fields. All counts were taken in one section of 
each field. The section of the trapped fields selected for 
observation was bordered on at least two sides by the same type 
of trapping system. Twenty 25-plant samples per field were 
taken in each of four fields at irregular intervals throughout 
the season. Fields are identified as Crowley's, Sullivan's, 
Miller's, and Lumpkin’s (fig. 1). 
