Dispersal and Migration of Tepa-Sterilized Mexican Fruit Flies1

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Abstract
About 7,700,000 marked (sprayed with colored lacquer) and sterilized (with tepa) adult Mexican fruit flies, Anastrepha ludens (Loew), were released between 1963 and 1965 in several areas of Texas and Mexico for study of dispersion and migration, One fly was recovered 12 months after release. Maximum migrations were 11 miles in Morelos, 23 miles in northwestern Baja California, and 12 miles from Tijuana, Baja California. into California. (Air currents are believed to have aided migrations. However, dispersal of 3-5 miles was normal.) Estimates of native fly population of 1 per square mile in Texas and 29 per square mile in Tijuana were derived by comparing the numbers of native flies captured with the number of sterile flies recaptured.

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