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Adjusting Herbicide Adjusting Herbicide Programs to Emerging Programs to Emerging
Weed Problems Weed Problems in Peanutin Peanut
Eric P. ProstkoEric P. Prostko
Extension Weed SpecialistExtension Weed Specialist
University of GeorgiaUniversity of Georgia
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Why do “new” weed problems occur?Why do “new” weed problems occur?
reliance on herbicidesreliance on herbicides decreases in cultivation decreases in cultivation ecological shiftsecological shifts herbicide resistanceherbicide resistance
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New or Unique Weed Problems New or Unique Weed Problems in Peanuts in Peanuts
tropic crotontropic croton dayflower/spider-dayflower/spider-
wortwort ecliptaeclipta copperleafcopperleaf spiderflowerspiderflower redweedredweed ALS-resistant ALS-resistant
pigweedpigweed
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Tropic Croton Tropic Croton (Croton glandulosus)(Croton glandulosus)
3rd most troublesome 3rd most troublesome weedweed
Cadre is weakCadre is weak not as competitive as not as competitive as
other weeds other weeds PRE - Valor or PRE - Valor or
StrongarmStrongarm POST - Ultra BlazerPOST - Ultra Blazer Cadre/Blazer Cadre/Blazer
tank/mixes???tank/mixes???
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Dayflower/Spiderwort Dayflower/Spiderwort (Commelina spp.)(Commelina spp.)
Berrien, Brooks, Berrien, Brooks, Grady, ThomasGrady, Thomas
limited datalimited data Roundup is weakRoundup is weak PRE - Dual PRE - Dual
(timing)(timing) POST - BasagranPOST - Basagran others????others????
Asiatic
spreading
spiderwort
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Tropical spiderwort, Cairo, GA, 2001
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Residual Spiderwort Control in PeanutsResidual Spiderwort Control in Peanuts with Dual Magnum, Brooks County, GA with Dual Magnum, Brooks County, GA
2.2
7.6
0
2
4
6
8
Dual No Dual
Pla
nts/
ft2
Dual Magnum @ 1 pt/A Applied: July 2, 2001 Rated: August 1, 2001
b
a
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Eclipta Eclipta (Eclipta prostrata)(Eclipta prostrata)
low, moist areaslow, moist areas limited biology datalimited biology data PRE - Strongarm, PRE - Strongarm,
Valor, Dual, OutlookValor, Dual, Outlook POST - Basagran, POST - Basagran,
Storm, Tough Storm, Tough timing is criticaltiming is critical
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Eclipta Control in Peanuts with POST Eclipta Control in Peanuts with POST HerbicidesHerbicides
0
20
40
60
80
100
Cadre
Blazer
Storm
Basag
ran
Tough
2,4-
DB
Herbicide
Con
trol
(%
)
2" or less
3-5"
Grichar, 1997
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Hophornbeam Copperleaf Hophornbeam Copperleaf (Acalypha (Acalypha ostryifolia)ostryifolia)
Randolph, TerrellRandolph, Terrell limited biology limited biology
datadata PRE - Valor or PRE - Valor or
StrongarmStrongarm POST - Ultra POST - Ultra
Blazer, StormBlazer, Storm
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Hophornbeam Copperleaf ControlHophornbeam Copperleaf ControlRandolph County, GA - 2001Randolph County, GA - 2001
6 WAT
Untreated Strongarm Valor
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Spiderflower Spiderflower (Cleome spp.)(Cleome spp.)
Laurens CountyLaurens County limited datalimited data PRE - PursuitPRE - Pursuit POST - Pursuit, POST - Pursuit,
Cadre, Ultra Cadre, Ultra Blazer (bloom Blazer (bloom stage)stage)
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Redweed Redweed (Melochia corchorifolia)(Melochia corchorifolia)
low, moist areas low, moist areas hard seed coathard seed coat season long season long
germinationgermination PRE - Strongarm, PRE - Strongarm,
Valor, ZorialValor, Zorial POST - POST -
Basagran, Storm, Basagran, Storm, CadreCadre
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ALS-Resistant Palmer PigweedALS-Resistant Palmer Pigweed
Burke CountyBurke County 20012001 do not use Cadre, do not use Cadre,
Pursuit, Classic, Pursuit, Classic, StrongarmStrongarm
Prowl, Sonalan, Prowl, Sonalan, Dual, Valor, Ultra Dual, Valor, Ultra Blazer, StormBlazer, Storm
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SummarySummary
Newer soil applied herbicides will help Newer soil applied herbicides will help control some of the unique weed problems.control some of the unique weed problems.
Combinations of PRE and POST Combinations of PRE and POST treatments will provide consistent control.treatments will provide consistent control.
Need more information about biology and Need more information about biology and competitiveness of newer weed problems competitiveness of newer weed problems in order to make better control decisions.in order to make better control decisions.
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University ofGeorgia
ExtensionWeed Science(gaweed.com)