From January 19 to February 16, 1979, adults from about
 7000 pupae per day were released at the Federal Experiment
 Station to evaluate infusion and spread of the sterility factor
 from a point release. Males from the first release were recaptured
 in traps located 5 miles west to 7.5 miles east to 4 miles north of
 the release point. Overall, 86% were captured within 2 miles of
 the release point with fewer than 3.1% captured more than 6 miles
 from the release point. About one month following the first
 release, about 10% of the native males collected in traps were
 backcross (BC) specimens. At some locations, one-third of the
 males were BC males. The frequency stabilized at about 37c,
 approximately 4 generations after the release. This persisted
 through the low population period of July and August and the
 BC frequency remained at this level after the initial population
 increase of September through November. Released insects inter-


Fig. 3. Egg of the pigeon pea pod borer on flower bud.
8-10 generations of pod borers per year on St. Croix.
 Three release strategies were conducted: (1) single point
release at Federal Experiment Station (2) release over Western
St. Croix and (3) full release program over entire island to evaluate
the backcross insect as a suppression technique. Sterile Heliothis
backcross insects used in the releases were reared at Stoneville,
Mississippi and shipped in the pupal stage to St. Croix via postal
service. They were placed in field cages (Fig. 5) and the adults
allowed to emerge, leave the cage and interact with the native
population. Fig. 4a. Larva feeding on pigeon pea flower.


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