New Insecticide Chemistries for Management of
Silverleaf WhiteflyAlton N. Sparks, Jr.
Extension EntomologistUniversity of Georgia, Tifton Campus
New Insecticides for Whiteflies
• Movento (spirotetramat)• Coragen (chlorantraniliprole) • First impressions and current view• Understanding of a products
capabilities is necessary for incorporation into IPM programs and evaluation.
Silverleaf Whitefly
• Bemisia tabaci, (B. argentifolii) • Silverleaf/Sweet potato/Poinsettia • Wide host range• Likes hot dry weather• Primarily summer/fall pest in Ga.• Damage:
– Feeding, honeydew, sooty mold– Plant disorders, virus vector
Whitefly Management• Do not overwinter populations• Start fields clean (clean transplants)• Separate hosts crops when possible• Avoid susceptible crops in fall if
possible• Insecticides
– Soil applied systemic– Foliar insecticides
Systemic Insecticides for SLWF
• Neonicotinoid insecticides–Admire Pro (generics)–Platinum–Venom
• Coragen• Durivo (Coragen+Platinum)
Foliar Insecticides for SLWF• Pyrethroids + organophosphates• Endosulfan• Neonicotinoids (Actara, Assail, Venom)
• Knack• Courier• Rimon• Oberon, Movento• Coragen (Voliam)
Movento• A.I. – spirotetramat (Group 23)• Bayer CropScience• Movento
–Highly systemic–Foliar applications only–Adjuvant necessary (on label)–Aphids, whiteflies
PhloemUpward and downwardtransport
XylemUpwardtransport
Spirotetramat application sites
Artificial caged infestation of Green Peach Aphid was controlled 3 days after application
Behavior within the Plant
Mealy Plum Aphid Fresno, CA – 2006 on French
Prune
0
10
20
30
40
50
60
70
80
90
100
7 14 21 29 36 42
Untreated
PROVADO - 6 fl oz
MOVENTO - 5 fl oz
MOVENTO - 5 fl oz +0.25% Succeed
MOVENTO - 5 fl oz +0.834% Induce
MOVENTO - 5 fl oz +0.21% Silwet
ID06NARSKHURW1. Dr. Richard Warner – Bayer CropScience.
% In
fest
ed T
erm
inal
s
DATWith surfactants
Surfactant Impact:
Coragen• A.I. – chlorantraniliprole (rynaxypyr)• DuPont• Coragen (also in Durivo and Voliam)
– Excellent control of caterpillars– Systemic activity (soil applications)– Adjuvants help foliar applications
(not on all crop labels)– Whitefly activity debatable
Chlorantraniliprole for SLWF
• Vegetable Entomologist Workshop Monterey, California, May 2008
• Best Management Practices for Pest Control in Vegetables
• “Not consistent for whitefly control; suppression at best”
Movento - First Experience• Activity on whitefly (no specifics)• Threw it in a squash test in fall of 2007• Foliar applications at first signs of
silvering• Extreme pest pressure• NOTHING WORKED very well• Had doubts about its activity on SLWF
• Bayer requested greenhouse work
First Impressions
• Movento– Little or no activity on SLWF
• Coragen– Excellent activity on SLWF– Possible replacement for Admire
Greenhouse Studies
• At time of application– Two non-treated plants monitored– Oldest infestation – even mix of small
and large nymphs– Middle infestation – small nymphs +
few eggs– Youngest infestation – recently
hatched nymphs + few eggs
Whitefly per leaf (snap beans) Earliest (oldest) infestation
0
2
4
6
8
10
12
14
Check
Synap
seS+S
ilwet
S+Induce
S+MSO
Movento
Venom
PupaeL. nymphsS. nymphs
Evaluated at 7 DAT
Whitefly per leaf (snap beans) Second infestation
0
2
4
6
8
10
12
Check
Synap
seS+S
ilwet
S+Induce
S+MSO
Movento
Venom
L. nymphsS. nymphs
Evaluated at 10 DAT
SLWF greenhouse Cucumber Test 2 Oldest leaf
0
5
10
15
20
25
Check
Synap
seSun+
MSO
Coragen
Cor+MSO
Movento
Emerged PLar. Nym.Sm. Nym.
SLWF greenhouse Cucumber Test 2Youngest leaf
0
5
10
15
20
25
30
Check
Synap
seSun+
MSO
Coragen
Cor+MSO
Movento
Emerged PLar. Nym.Sm. Nym.
Number of plants with silverleafDrench Treatments - 2006
0123456789
1012
DA
T
14 D
AT
21 D
AT
29 D
AT
33 D
AT
47 D
AT
CheckVenomAdmireCoragen
Transplant drench (Oct. 31, one true leaf); pest pressure light to moderate
Silverleaf RatingsSoil and Foliar Treatments - 2007
0
1
2
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5
6
7
8
13/7 DAT 17/11 DAT 23/17 DAT 31/26 DAT
CheckVenom (s)Venom (f)Coragen (s)Coragen+ (f)
Soil app. at cotyledon stage, first foliar 6 days later. Bif+Ort 3 times.
Silverleaf RatingsFoliar Treatments - 2008
0
1
2
3
4
5
6
3 DAT-1
6 DAT-1
3 DAT-2
1 DAT-3
6 DAT-3
4 DAT-4
7 DAT-4
CheckAssailCoragenCoragen+
Four weekly applications, minor silverleaf at first application.
Squash Silverleaf Ratings (0 to 6)Drench Treatments - 2008
0
1
2
3
4
5
6
9/2/
2008
9/4/
2008
9/6/
2008
9/8/
2008
9/10
/200
8
9/12
/200
8
9/14
/200
8
9/16
/200
8
9/18
/200
8
9/20
/200
8
9/22
/200
8
9/24
/200
8
CoragenVenom1013Check
Treatments applied 8/15/08 and 9/3/08
Current Views• Movento provides excellent control of
early instar whitefly nymphs• Coragen activity may be similar
– Addition of surfactant significantly increases efficacy of foliar treatments (label restrictions)
– Efficacy much better as preventive treatment
– Soil application longer residual
Current Views• Movento and Coragen provide excellent control
of early instar whitefly nymphs– Should be considered in
• product selection• application timing• product evaluation
– Probably not suitable for rescue treatment or stand alone on siesitive crops
– Excellent preventive or rotation partner (unique MOA, highly systemic, long residual)