Florida anticipates end to screwworm infestation in Keys

FILE - In this February 2013 file photo, a Key deer forages for food in the National Key Deer Refuge in the Florida Keys. An agricultural emergency has been declared in the Florida Keys over a fly larvae infestation threatening endangered deer found only in the island chain. In a statement Monday, Oct. 3, 2016, Agriculture Commissioner Adam Putnam said the discovery of New World screwworm in the National Key Deer Refuge “sends shivers down every rancher’s spine.” Screwworm feed on the animals’ flesh, and infestations can be fatal to livestock and pets. (AP Photo/Beth J. Harpaz, File)

MIAMI BEACH, Fla. (AP) — Florida’s agriculture commissioner said Thursday that the state anticipates winning its fight against flesh-eating maggots threatening endangered deer in the Florida Keys.

“It’s too early to declare mission accomplished,” Commissioner Adam Putnam said, but he added that no wild screwworm flies have been found in the island chain since Jan. 10.

That amounts to three life cycles of the parasite, and officials have decided it’s safe to begin winding down efforts to keep the screwworms from spreading from the island chain onto the mainland, Putnam said.

New World screwworm can eat livestock and pets alive, and once cost the U.S. livestock industry millions every year. There hadn’t been a U.S. infestation in over 30 years, until agriculture officials confirmed in September that screwworm was killing the dog-sized Key deer whose range is limited to a national wildlife refuge.

To kill the parasite’s population, millions of male screwworm flies sterilized with radiation have been released since October over the Keys and agricultural areas south of Miami.

Putnam said those releases will end in late April. The last batches of sterilized flies will still offer protection through the deer’s spring fawning season.

The state also plans as early as next week to shut down a highway checkpoint where animals leaving the Keys were inspected for screwworm infections. A stray dog found near Homestead in early January was the only animal on the mainland to show signs of screwworm.

The Keys’ isolation helped control the infestation, Putnam said.

“We had better control of access to the Keys, because we had one road in and one road out,” he said. “Unfortunately, the most impacted species was one of the rarest, the Key deer.”

Fewer than 1,000 Key deer are believed to survive. The infestation killed roughly 140 members of the unique herd, but U.S. wildlife officials have said no Key deer have died because of screwworms since January.

It’s still unclear where the screwworms came from. A traveler must have brought the parasite into the area around the National Key Deer Refuge on Big Pine Key, but the genetic makeup of the flies in Florida doesn’t match screwworm populations identified in the Caribbean, Putnam said.



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