susceptibility of silverleaf whitefly to group 4...
TRANSCRIPT
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Susceptibility of Silverleaf Whitefly to
Group 4 Insecticides
Hugh Smith
University of Florida/IFAS/
Gulf Coast Research and Education Center
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Silverleaf whitefly,
Bemisia tabaci biotype B
Life cycle ~ ● about 3 wks from egg to adult.
● adults can live up to 2 wks.
● est. 5 wks btwn generations.
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Tomato yellow leaf curl virus –
vectored by silverleaf whitefly
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Managing TYLCV
● Destroy crop residues and
other virus reservoirs
● Complete destruction of
plant is necessary.
● New growth from flamed or herbicided
fields can be highly viruliferus.
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Reflective mulches repel whiteflies early in the
season.
Managing TYLCV
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Varieties of tomato tolerant of TYLCV are available.
Florida 47 Tolerant variety
Managing TYLCV
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Managing TYLCV
0
500
1000
1500
2000
2500
Charger FL 47 RidgeRunner Tygress
2013 Fall TYLCV studyAUDPC Cumulative Virus
A A
Courtesy Gary Vallad
A
B
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Seedlings are treated for whiteflies in the nursery
Managing TYLCV
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Whitefly
materials
IRAC
#
Active ingredient
Monitor 1B methamidophos
Until end 2013
Thionex 1C endosulfan
Until end 2014
Malathion 1B
Lannate 1A
Managing TYLCV
Insecticides
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New EPA Pollinator Advisory language
will be appearing on labels.
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Group 4 IRAC # Active ingredient
Admire (soil)
Provado (foliar)
4A imidacloprid
Platinum (soil)
Actara (foliar)
4A thiamethoxam
Venom (soil/fol)
Scorpion (foliar)
4A dinotefuran
Assail (foliar) 4A acetamiprid
Durivo (soil) 28 + 4A chlorantraniliprole +
thiamethoxam
Closer 4C sulfoxaflor
Sivanto 4D flupyradifurone (reg
2015?)
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Neonicotinoids, Closer, and Sivanto all have the
same mode of action:
Nicotinic acetylcholine receptor (nAChR)
agonists
http://www.irac-online.org/documents/moa-classification/?ext=pdf
Bayer has carried out
extensive tests to confirm
that Sivanto poses minimal
risk to honeybees and
bumblebees.
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Examples IRAC
#
Active ingredient
Various
pyrethroids
3 Bifenthrin
Fulfill 9B Pymetrozine(feeding inhibitor)
Verimark (soil) 28 Cyazypyr /
cyantraniliprole
Exirel (foliar) 28 Cyazypyr /
cyantraniliprole
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Softer
Examples
IRAC
#
Active ingredient
M-Pede ~ Insecticidal soap
Aza-Direct ~ Botanical (azadirachtin)
Requiem ~ Botanical (extract of Chenopodium
ambrosioides)
Grandevo ~ Microbial (Chromobacterium
subtsugae)
MET-52 Microbial (Metarhizium anisopliae
strain F52)
PFR-97 ~ Microbial (Isaria fumosorosea
Apopka strain 97)
Botanigard ~ Microbial (Beauvaria bassiana strain
GHA)
Whitefly materials
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Irregular ripening is caused by feeding of
whitefly nymphs
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Examples IRAC
#
Active ingredient
Some nymph materials
Knack 7D Pyriproxifen(egg suppression)
Courier 16 Buprofezin(egg suppression)
Movento
Oberon
23 Spirotetramat(egg suppression)
Spiromesifen
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1 2 3 4 5 6 7 8 9 10 11 12 13
MOA 1 MOA 2 MOA 3
WK
● Confine MOA to 5 wk treatment window.
● Use different MOA in following 5 wk window.
Group 4 and 28*Suppression of nymphs
*Durivo
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● 4A:Admire (imidacloprid)
Venom (dinotefuran)
Platinum (thiamethoxam)
● 4D:Sivanto (flupyradifurone).
Silverleaf
whitefly
Testing susceptibility of field populations of
silverleaf whitefly to three established
neonicotinoid insecticides and one new
butenolide insecticide.
Funding provided by Florida Tomato
Institute and Bayer Crop Science.
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Monitoring neonicotinoid resistance in biotype
B of Bemisia tabaci in Florida
David J Schuster, Rajinder S Mann,Marco
Toapanta,Roberto Cordero,
Sandra Thompson, Sabrina Cyman, Aaron
Shurtleff and Roy F Morris Il
Pest Manag Sci (2008)
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Methods
●Systemic cotton petiole bioassay
●Four insecticides
●Six concentrations: 0, 1.2, 4.7, 18.8, 75, 300 ppm.
●Field populations are compared to susceptible laboratory
colony.
●Mortality is measured 24, 48 and 72 hours after treatment
Cotton petioles
take up insecticide
treatments for 24
hours.
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Admire: 29.4 mg ai /plant
Sivanto: 14.3 mg ai /plant
Platinum: 13.4 mg ai /plant
Venom: 37.2 mg ai /plant
How much active ingredient is applied
per plant at-plant according to the
label?
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Ruskin Site 1
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Homestead Site 1
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Resistance ratio =
LC50 Field Population
÷
LC50 Susceptible Lab Colony
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Acknowledgements
Curtis Nagle
Bryan Hammons
Justin Carter
Deborah Farr
Laurie Chambers
Lorna Carter
WinDi Sanchez
Charles MacVean