Giant African Land Snail Eradication Program
Program Update
February 26, 2019
Giant African Land Snail
Listed as one of the top 100 invasive species in the world
➢ Major landscape/agricultural pest
➢ Public health threat
➢ Feeds on stucco to buildshell
➢ Reproduces rapidly
➢ No natural enemies
1
Global Invasive Species Database (2019). Downloaded from
http://www.iucngisd.org/gisd/100_worst.php on February 4, 2019
1
Pose significant risk to sustainability of natural resources and
agricultural products
▪ Quarantine/trade implications▪ Restrict movement of commodities
▪ Economic impact▪ Millions of dollars in crop damage
and/or export restrictions
▪ Environmental impact▪ No known natural predator in Florida
Invasive Agricultural Pest
EYW
Port of Key West
Port of Miami
Port
Everglades
MIA
FLL
PBI
MLB
MCO
SFB
DBIA
JAX
TLH
ECP
TPA
PIF
GRQ
RSW
Port of
Palm Beach
Port of
Ft Pierce
Port of
Manatee
Port of
St. Petersburg
Port of
Jacksonville
Port of
Fernandina
Port of
St. Joe
Port of Panama City
Port of Pensacola
Florida Satellite Image
www.mapwise.com
• Consume more than 500 species of plants.
▪ Can grow up to 8 inches in length.
• Adult GALS can lay more than 2,600 eggs annually1
Biology
1 Dickens L.K., Capinera J.L., & Smith T.R. (2018). Laboratory assessment of growth and reproduction of Lissachatina fulica (Gastropoda: Achatinidae). Journal of Molluscan Studies, 84(1), 46-53
• 3 GALS specimens were discovered in 1966 in a residential neighborhood in NW Miami
▪ They were released by the grandmother of a young child who brought them from Hawaii as pets
History in Florida
• 7 years of control actions (including use of arsenic-based metaldehyde products, now banned by the EPA) resulted in more than 18,000 GALS collected
• The eradication effort spanned 10 years at a cost of $1 million dollars (1960)
History in Florida
How current infestation was discovered
• September 2011 - Homeowner asked Department plant inspector to help identify snails she was finding all over her yard. Giant African land snail positively identified in Miami
• FDACS and USDA immediately mobilized an emergency response program to determine the extent of the infestation and begin control activities
Current Eradication Effort
Cumulative Stats:
32 cores (31 in Miami-
Dade and 1 in Broward)
719 positive properties
168,434 snails collected to date
3,032 properties in all cores and grids
Program Status
Current Snapshot:10 active cores (9 in
Miami-Dade and 1 in Broward)
218 positive propertiesNo live snails collected since December 2017976 properties in all cores and grids
Program Status
2018 Highlights
OUTREACH• 30 Calls to the DPI helpline• 5 major, 20 minor outreach
events attended• More than 6,000 pieces of
literature distributed to elementary schools near core areas.
OPERATIONS• More than 2,000 non-core
surveys conducted• Picayune Strand State Forest
Survey• Visit by Dr. Marcus Ramdwar,
University of Trinidad & Tobago
2018 Highlights
Picayune Strand State Forest Survey• 1 shell found by FFS personnel• 3 survey operations• 20 personnel• 146 sites surveyed• No live GALS (or additional
shells) detected
Press ConferencesCommunity Cultural ForumInternational TV ProgramsSocial MediaRadio/TV advertisingPresentations at Community Events
Public Outreach
Public Outreach
• Giant African land snails carry Angiostrongylus cantonensis (rat lungworm) – the adult form of the parasite is found in rats
• Infected rats pass larvae in their feces
• Snails and slugs get infected by ingesting the larvae
• Humans and animals get infected by ingesting raw or undercooked snails
• Can cause eosinophilic meningitis in humans
• Specimens collected in most cores have tested positive for RLW
• No reported cases of humans or animals contracting the disease from the Florida GALS program
GALS program partners withFDOH on public education
Rat Lungworm Parasite
• Program office established in Miami
• 25 full-time FDACS employees assigned to the program
Field Operations
• ‘Boots on Ground’ control approach
➢ Survey
➢ Hand collect snails
➢ Treat properties with EPA-approved molluscicide (Metaldehyde)
➢ Collect and dispose of debris
Frequency of control activities on the 3,000+ properties in the treatment area depends on their designated color
alert level, based on the last live GALS found
Program Methodology
Debris removal is critical to eliminating snail habitat for easier collection and insecticide efficacy
More than 3.6 million pounds removed program-wide
Program Methodology
• Lab Work
➢ Daily collection reports
➢ Snails sorting and measuring
➢ Snail destruction by freezing
➢ Reproductionstudies
➢ Mortality determination
Program Methodology
K-9 Bear and Larry
K-9 Sierra and Omar
Night Team Spray Team
Specialized Teams
K-9 Bear and Larry
K-9 Sierra and Omar
Debris Team Detector Dog
Specialized Teams
K-9 Melon and Denise
• Two dog teams trained and placed into service on the GALS program in June 2014
• Dogs can differentiate between target and non-target snails
• Dogs sit when they alert on a GALS
• If a dog finds a live GALS on a property, the survey is terminated and human survey teams take over the search
Detector Dogs to the Rescue
September
2011
September
2012
September
2013
September
2014
September
2015
September
2016
September
2017
September
2018
ACTIVE CORES 5 18 22 28 29 27 22 12
DECOMMISSIONED
CORES- - - - - 4 10 20
ACTIVE POSITIVE
PROPERTIES104 384 598 663 669 686 704 422
DECOMMISSIONED
POSITIVE
PROPERTIES
- - - - - - 15 295
CORE SURVEYS 12,840 53,664 76,914 109,767 138,598 165,073 188,595 209,657
NON-CORE SURVEYS - - - - 7,296 17,190 26,480 35,343
TREATMENTS - 21,936 45,623 73,807 85,549 91,086 96,470 101,675
GALS COLLECTED 9,630 73,796 121,011 137,343 147,474 152,488 168,265 168,429
DEBRIS COLLECTED - - 539,800 1,130,160 1,568,280 2,720,840 3,399,500 3,798,060
STAFF 35 44 53 45 44 29 32 27
Program Snapshot
Color Alert Plan
For positive, adjoining, & adjacent properties after last live GALS detected:
• Seventeen months of surveys with a minimum of twenty-six treatments
• Nineteen months of survey with no treatments
• Minimum of one detector dog survey
• Minimum of one night survey
Establishes a process whereby core areas that meet the below criteria can be eligible for decommission and associated quarantine zones lifted.
Decommission Plan
• 22 cores decommissioned to date:
➢ 2016: 9 Cores => 572 properties
➢ 2017: 6 Cores => 235 properties
➢ 2018: 7 Cores => 1,282 properties
• 13 Quarantine zones lifted to date
Decommission to Date
• 32 Cores
• 28 Quarantine Zones in Miami-Dade and Broward Counties
• Average 3,600 live snails collected a month (2012)
Where we were . . .
• Halfway through Year 7 of eradication program
• 22 Cores decommissioned
• No live snails detected since 12/19/17
Snail
count
down
Mortality rate up
Where we are . . .
• Incorporate new tools and methods as they become available (activators, traps, etc.)
• Identify other areas in FL where the snail may remain undetected
• Continue outreach to the public – they are one of the keys to eradication
• Continue decommission of current active cores, until eradication is declared
Program thanks residents who first reportedGALS in Core 1 for their cooperation throughoutthe 7 years of program operations in that area
Where we want to be . . .
Be on the look out!
Thank You!