Slimy invasion by giant snails

An African snail (Picture: AFP)
An African snail (Picture: AFP)

Orlando - South Florida is fighting a growing infestation of one of the world's most destructive invasive species: the giant African land snail, which can grow as big as a rat and gnaw through stucco and plaster.

More than 1 000 of the mollusks are being caught each week in Miami-Dade and 117 000 in total since the first snail was spotted by a homeowner in September 2011, said Denise Feiber, a spokesperson for the Florida Department of Agriculture and Consumer Services.

Residents will soon likely begin encountering them more often, crunching them underfoot as the snails emerge from underground hibernation at the start of the state's rainy season in just seven weeks, Feiber said.

The snails attack "over 500 known species of plants ... pretty much anything that's in their path and green," Feiber said.

In some Caribbean countries, such as Barbados, which are overrun with the creatures, the snails' shells blow out tires on the highway and turn into hurling projectiles from lawnmower blades, while their slime and excrement coat walls and pavement.

"It becomes a slick mess," Feiber said.

Carry disease

A typical snail can produce about 1 200 eggs a year and the creatures are a particular pest in homes because of their fondness for stucco, devoured for the calcium content they need for their shells.

The snails also carry a parasitic rat lungworm that can cause illness in humans, including a form of meningitis, Feiber said, although no such cases have yet been identified in the United States.

The snails' saga is something of a sequel to the Florida horror show of exotic species invasions, including the well-known infestation of giant Burmese pythons, which became established in the Everglades in 2000. There is a long list of destructive non-native species that thrive in the state's moist, subtropical climate.

Experts gathered last week in Gainesville, Florida, for a Giant African Land Snail Science Symposium, to seek the best ways to eradicate the mollusks, including use of a stronger bait approved recently by the federal government.

Feiber said investigators were trying to trace the snail infestation source. One possibility being examined is a Miami Santeria group, a religion with West African and Caribbean roots, which was found in 2010 to be using the large snails in its rituals, she said. But many exotic species come into the United States unintentionally in freight or tourists' baggage.

"If you got a ham sandwich in Jamaica or the Dominican Republic, or an orange, and you didn't eat it all and you bring it back into the States and then you discard it, at some point, things can emerge from those products," Feiber said.

Authorities are expanding a series of announcements on buses, billboards and in movie theaters urging the public to be on the lookout.

The last known Florida invasion of the giant mollusks occurred in 1966, when a boy returning to Miami from a vacation in Hawaii brought back three of them, possibly in his jacket pockets. His grandmother eventually released the snails into her garden where the population grew in seven years to 17,000 snails. The state spent $1 million and 10 years eradicating them.

Feiber said many people unfamiliar with the danger viewed the snails as cute pets.

"They're huge, they move around, they look like they're looking at you ... communicating with you, and people enjoy them for that," Feiber said. "But they don't realize the devastation they can create if they are released into the environment where they don't have any natural enemies and they thrive."

We live in a world where facts and fiction get blurred
In times of uncertainty you need journalism you can trust. For only R75 per month, you have access to a world of in-depth analyses, investigative journalism, top opinions and a range of features. Journalism strengthens democracy. Invest in the future today.
Subscribe to News24
Lockdown For
DAYS
HRS
MINS
Voting Booth
Who do you think is going to win the 2020 US election?
Please select an option Oops! Something went wrong, please try again later.
Results
Biden is going to take it
47% - 9810 votes
It's four more years for Trump
53% - 11020 votes
Vote
ZAR/USD
16.38
(-1.31)
ZAR/GBP
21.28
(-0.88)
ZAR/EUR
19.26
(-0.96)
ZAR/AUD
11.54
(-0.07)
ZAR/JPY
0.16
(-1.44)
Gold
1876.32
(-1.48)
Silver
23.35
(-3.87)
Platinum
870.00
(-0.47)
Brent Crude
41.09
(+1.96)
Palladium
2231.48
(-3.18)
All Share
52308.14
(-3.28)
Top 40
47930.58
(-3.29)
Financial 15
10026.43
(-4.54)
Industrial 25
72862.13
(-1.98)
Resource 10
48131.41
(-4.51)
All JSE data delayed by at least 15 minutes morningstar logo