rodent feed-through insecticides used to control sand flies-registration and field work challenge...
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Rodent Feed-Through Insecticides Used to Control Sand Flies-
Registration and Field Work Challenge
Richard Poche’, Genesis LabsWellington, Colorado
The ProblemCutaneous Leishmaniasis
The Process• Screen compounds that are efficacious against
larval/adult sand flies• Develop formulation(s) that are species specific• Collect data for EPA Section 3 registration
application– Product chemistry– Product performance– Environmental safety– Regulatory hurtles
Rodent Species + Vector• Fat sand rat Psammomys obesus• Jird Meriones spp• Sand fly species
– Phlebotomus papatasi
Leishmania major ecology
Sand fly Sand ratSaltbush
Promastigote
Amastigote
Bait Development• Rodent food habits in the wild• Laboratory screening of potential bait ingredients• Attractants• Bait type
– Grain– Pellet– Gel ?
• Pilot field test• Large-scale field test
Colorado
Lab Studies with Fleas on Rodents
Mortality of P. papatasi 1st instar larvae due to imidacloprid
0
0.2
0.4
0.6
0.8
1
1.2
0 1 2 3 4 5 6 7
Pro
po
rtio
n a
live
Day
male
female
Mortality of P. papatasi 1st instar larvae due to imidacloprid: effect of
host sex
Israel
Tunisia
Lab test using 0.025% imidacloprid bait presented to the jird Meriones
shawii
Control Test
Meriones M1 M2 M3 M4
Sept. 1, 2009 50g untreated
lab chow
50g untreated
lab chow
50g treated
bait
50g treated
bait
Sept. 1, 2009 bloodfed
40 ♀+ 10 ♂
bloodfed
40 ♀+ 10 ♂
bloodfed
40 ♀+ 10 ♂
bloodfed
40 ♀+ 10 ♂
No. ♀
bloodfed 39/40 38/40 37/40 40/40
Mortality 20
min. after
bloodmeal
0 0 37 40
Remarks. Test flies that did not take blood meals survived.
Efficacy of products on Phlebotomus argentipes larvae when fed Rattus rattus feces collected after
feed-through
DAY 1
2 3 4 5 6 7 8 9 10 110
10
20
30
40
50
60
70
80
90
100
DIFLUBENZURON 0.048%
FIPRONIL 0.015%
EPRINOMECTIN 0.01%
EPRINOMECTIN 0.025%
IVERMECTIN 0.025%
CONTROL% E
FF
ICA
CY
Fipronil 0.015% as a feed-through for use against P. argentipes
1 2 3 40
10
20
30
40
50
60
70
80
90
100
Day 5Day 10
Per
cent
age
Days
Outcome
Field Rodent Flea Control Bait
• Targets ground squirrels- Spermophilus spp.• Oropsylla idahoensis, Hoplosyllus anomalus –
and other species• Soon to add prairie dogs Cynomys spp. and O.
hirsuta
Borchert, J. et al. 2009. J. Medical Entomology. In press.
Feed-through experiments with P. argentipes
• Ivermetcin• Ivermectin +
parziquantel• Diflubenzuron• Fipronil• Flumethrin
• Fenbendazole• Doramectin• Moxidectin• Beta-cyfluthrin• Garlic• Tetrachlorvinphos
Plans for 2010-11• Continue screening candidate compounds• Conduct field trials in Tunisia, Israel, and Egypt• Develop data package for selected compounds
for EPA approval• Conduct finalized testing using Good Laboratory
Practice Standards
AcknowledgementThis research was funded by the Deployed
War-Fighter Protection (DWFP) Research Program, funded by the US Department of Defense through the Armed Forces Pest
Management Board (AFPMB)
AcknowledgementsMany people who assisted with the study in some
way: Ed Rowton, Gideon Wasserberg, David Miller, David Poche, Marcus O’Bryon,
Elyes & Efm Zioua, Ruti Berger,
Walter Reed Army Institute of Research, Ben-Gurion University of the Negev, Israel, Pasteur Institute, Tunisia