Spotted-Wing Drosophila (SWD) in Blueberries New Insights & Solutions Blair Sampson USDA-ARS Poplarville, MS
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Spotted-Wing
Drosophila
(SWD) in Blueberries
New Insights
& Solutions
Blair Sampson
USDA-ARS Poplarville, MS
Female
SWD
Male
SWD
Serrated “saw-like”
egg-laying tube of a
Female SWD
ancestral-type
ovipositors
derived-type
ovipositors
from: Atallah et al. 2013. Proc. R. Soc. 281
Complete 2 – 3 generations onBlueberry
20% damage typical
SWD
larva
CFW
larva
(moth caterpillar)
Subsurface eggs of SWD
Southern blueberry shows no
obvious resistance to SWD egg-laying
(88 varieties and accessions)
% ETOH
0 10 20 30 40 50
% A
dult M
ort
alit
ya
fte
r 1
h
0
20
40
60
80
100
ADH-
SWD
WTDm
hours of exposure to 10% ethanol
1 2 3 4 5 6
% m
ort
alit
y0
20
40
60
80
100
female SWD
male SWD
SWD is not saprophagous and cannot be
F/M adult sex ratio
% ETOH
0 10 20 30 40
F/M
Se
x R
atio
0
1
2
3
4
5
6
ADH-
SWD
WTDm
Optimal adult production
%ETOH
0 10 20 30 40
ad
ults
pe
r vi
al
0
20
40
60
80
100
120
140
Optimal pupal production
% ETOH
0 10 20 30 40
pup
ae
pe
r vi
al
0
50
100
150
200
250
300ADH-SWDWTDm
ADH-SWDWTDm
SWD cannot
consume alcohol
Alcohol is poisonous
to adult & larval
SWDs, especially
to male flies
Implications:
spraying fallen fruit
is unlikely to kill SWD
they are not there!
Monitoring
(Lures)
ACV Traps
Wine+VinegarLure
“Commercial”Lure
PrototypeLure
7-day catches
Acknowledgements
Luis Monterde
Dong Cha
Peter Landolt
Karla Addesso
Oscar Liburd
Donna Marshall
Steve Stringer
Lavonne Stringer
Chris Werle
Trevor Mallette
John Adamczyk
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