Thanks to an alert fellow list member, who questioned me on that via a
private email, I investigated more fully. It turns out that the screw
worm infestations that now occur in the SW U.S. are more isolated and
sporadic occurances, some due to importation of cases in infected
animals, and some due to native infections. I'd gained the impression
from scattered reports I'd heard, and from a rancher friend who
probably never experienced the devastation of this pest prior to its
near elimination. However, eradicated is probably not a proper term
to use, since cases do occur, and some herds and some wildlife do
suffer substantial loss in Texas, Arizona, and Mexico.
It remains the case that release of sterile mosquitofish to control
mosquitofish reproduction has no basis in life history. The technique
works for screw worms, and for some other insects, because an
individual female mates only one time. Saturate the environment with
sterile males and the chance that she will find and mate with a
fertile male is very small.
David L. McNeely, Ph.D., Professor of Biology
Langston University; P.O. Box 1500
Langston, OK 73050; email: dlmcneely-in-lunet.edu
telephone: (405) 466-6025; fax: 405) 466-3307
home page http://www.lunet.edu/mcneely/index.htm
"Where are we going?" "I don't know, are we there yet?"
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