acted well with native insects, and mating pairs collected at host
sites indicated random mating between released and native insects.

 From November 1 to December 19, 1979, 10,000 pupae/day
were allowed to emerge in cages located on Western St. Croix. The
10 different release sites allowed for greater dispersion of the
released insects. Again, interaction between the native and released
insect appeared to be at random. Following this release, 50% of
the 1st field generation were backcross insects. The BC frequency
from this release persisted in the population with a loss of about
6% per generation.
 September 1, 1980 we began our all island release. At each of
50 sites located throughout St. Croix from 600-900 pupae/day
were set out in field cages. This rate of release lasted until Decem-
 Fig. 5. Field cage used to hold pupae until adult emergence and
 release.
 ber 19, 1980. The data from this release is still being calculated.
 Going into the all island release, 20-25% of the male pod borers
 were sterile backcross; this percentage jumped to 55% the first
 week in October. From that time the percentage backcross in-
 creased at a rate of 4-5% per week, so that the last week of Novem-
 ber, 86% of all field reared males were sterile backcross progeny.
 It is unlikely that any population can maintain itself with this
 amount of sterility.
 Although pigeon pea is not grown commercially on St. Croix,
 St. Croix is well suited to pigeon pea production. Also, pigeon pea
 is grown commercially throughout the West Indies. If this tech-
 nique continues to show success, then growers of pigeon pea as














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