This is why a competent and well staffed bureaucracy is so important. Screwworm is really easy to eliminate by flooding their population with males sterilized by radiation (females only mate once in their lifetime so their population falls off <i>fast</i>). There are factories in Latin America already set up to do so at large scale, all it would take is a contract with the USDA to guarantee enough supply for the states.<p>Edit: Hah, I get to eat my words. Turns out USDA and APHIS have been trying to fly planes over Mexico to release the sterile flies, but the Mexican government has been restricting the flight days and denying landing permission, which has hampered the program. Looks like the Mexican bureaucracy is the one failing here, and USDA/APHIS might be running pre-emptive releases in the US (but I can't find a source on that). They just agreed to lift those restrictions and cooperate more at the end of April.