Abstract
Laboratory-reared adult tobacco budworms, Heliothis virescens (F.), marked with dyes (fed in the larval diet) and sterilized by 60 Co irradiation were released at separate points in northeastern Mexico and southern Texas and recovered in sex-lure traps set at known distances at cardinal compass directions. In Mexico, male moths dispersed 10 miles (16.1 km) north in 24 h, and a distance-dilution effect was indicated. In southern Texas, moths dispersed as much as 70 miles (112.6 km) from the release point within an estimated period of 4–5 days. The locations of major areas of cultivated host plants in southern Texas were reflected by the high densities of native moths caught in the baited survey traps, but the numbers of marked, released moths caught at the various locations did not correspond to the numbers of native tobacco bud worms caught.
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