safety of sulfoxaflor and flupyradifurone for aphid predators
TRANSCRIPT
Safety of sulfoxaflor and flupyradifurone for aphid predators
J.P. MichaudKansas State University
Sorghum – Sugarcane Aphid Research Exchange Meeting
New Orleans, LAJanuary 7 – 8, 2016
Introduction
• Sulfoxaflor (Dow) and flupyradifurone (Bayer)are both effective against SCA
• How safe are they for predators expected to contribute to biocontrol of SCA?
• We tested Hippodamia convergens with multiple routes of exposure to both(topical, residual, feeding contaminated food)
• We started with recommended field rates (1 oz and 8 oz / acre, application in 10 gal H2O)
• We also reared out survivors to check forsublethal and transgenerational effects
Materials & Methods
• Topical exposure: Known volume of materialapplied to dorsum of adult or 4th instar
• Residue exposure: Application to leaf disc-> 24 h exposure of 1st instar larvae
• Consumption: Aphids sprayed with aphicide,fed to 4th instar larvae
• Mortality tallied after 24 h – survivors matedand reproduction observed
• High mortality – 0.1 X dose tested• Low mortatily – 2.0 X dose tested
Surv
ival
(%, 2
4 h)
Treatment
Topical application to adult H. convergens
Control Sulfoxaflor (1x) Sulfoxaflor (2x) Flupyradifurone (0.1x)
Flupyradifurone (1x)
0
20
40
60
80
100a a
a
b
a
*There were no significant effects on the reproductive performance of survivors
* * * *
Topical application to 4th instar H. convergensSu
rviv
al (%
adu
lts)
Control
Sulfo
xaflor (
1x)
Sulfo
xaflor (
2x)
Flupyradifu
rone (0
.1x)
Flupyradifu
rone (1
x)0
20
40
60
80
100
a
ab
b
c
c
Treatment
H. convergens larvae (1st instar) with 24 hexposure to leaf residues
Control
Sulfo
xaflor (1
x)
Sulfo
xaflor (2
x)
Flupyradifu
rone (
0.1x)
Flupyradifu
rone (1
x)0
20
40
60
80
100
Surv
ival
(% a
dults
)
Treatment
a
b
bcc
H. convergens adults fed contaminated prey (24 h)(surviving adults reproduced normally)
Treatment
Control
Sulfo
xaflor (1
x)
Sulfo
xaflor (
2x)
Flupyradifu
rone (0
.1x)
Flupyradifu
rone (1
x)0
20
40
60
80
100
Surv
ival
(%, 5
day
s)
a
b b
c
d
H. convergens larvae (4th) fed contaminated prey (24 h)(surviving adults reproduced normally)
Control Sulfoxaflor (1x) Sulfoxaflor (2x) Flupyradifurone (0.1x)
Flupyradifurone (1x)
0
20
40
60
80
100
a
b
bc
b
c
Surv
ival
(% a
dults
)
Treatment
Key Learnings• Sulfoxaflor is relatively safe for H.
convergens• Flupyradifurone is moderately
toxic, but probably less so than most conventional alternatives
• Highest risk is for early instar larvae contacting leaf residues• No apparent sublethal effects of either material