Screwworm comeback
Screwworms were once endemic to the US, but were eradicated in the 1960s amid a concerted effort to annihilate their population. This is done with aerial bombings of sterile male flies, which is the most effective weapon against the parasites. The mass release of dud studs elbows out fertile males, preventing them from mating with females, which generally only mate once.
With this method, called Sterile Insect Technique, the flies were eradicated not just from the US, but from all of Central America. They were declared eradicated from Panama in 2006.
Until recently, the screwworm population was kept at bay via a biological barrier along the Darién
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