 Once it was discovered that <unk> female <unk> <unk> flies are attracted to the song of Neoscapteriscus males in South America , a path to trap these flies at synthetic mole cricket song was opened . <unk> then led to a rearing method . <unk> rearing of over 10 @,@ 000 flies on mole cricket hosts allowed releases of living fly <unk> at many sites in Florida from the far northwest to the far south , mainly on golf courses , and mainly in 1989 @-@ 1991 . <unk> were established , began to spread , and were monitored by use of synthetic mole cricket song . Eventually it was discovered that the flies had a continuous population from about 29 degrees North all the way south to Miami , but that the flies failed to survive the winter north of about 29 degrees . <unk> and release of the flies to states north of Florida was thus a wasted effort . As the flies had been imported from 23 degrees South in Brazil and could not overwinter north of 29 degrees North in Florida , it was investigated in 1999 whether flies from 30 degrees South in Brazil might survive better in northern Florida , but they did not . 
