Scou%ng Sugarcane Aphids Timing effec%ve treatment to control sugarcane aphids (SCA) in sorghum depends on the size of the SCA popula%on. To es%mate the number of SCA in a field, follow these steps for scou%ng the field and use the Sampling Protocol (below) and % plants with aphids (on back) to make treatment decisions. First Detec6on: Is the Field at Risk? 1. Once a week, start on any edge of the field and examine 3 consecu%ve plants for aphids. Walk 5 more feet and sample 3 more consecu%ve plants. This is equal to 1 “Stop.” 2. Minimum distance between stops should be 40-50 S or paces. Repeat counts as in previous step for each stop (total = 9), making a “V” shape. 3. Average the number of aphids per upper and lower leaves to determine threshold level using 54 plants. Sorghum field NOT Present? If no SCA are present, or only a few wingless/winged aphids are on upper leaves, con%nue once-a- week scou%ng (protocol above). If SCA are found on lower or upper- canopy leaves, begin twice-a-week scou%ng. Use the Sampling Protocol (above) and % plants with 50-125 aphids per leaf (on back). Present? Brian McCornack, Sarah Zukoff, J.P. Michaud & Jeff Whitworth www.entomology.ksu.edu/extension start or Sugarcane aphid life stages A B C D E Wingless adult Nymph Winged juvenile Cast skin Winged adult 3 consecu%ve plants ~5S Stop #1 #2 #3 #4 #5 #6 #7 #8 #9 Sampling protocol
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Scou%ngSugarcaneAphids
Timingeffec%vetreatmenttocontrolsugarcaneaphids(SCA)insorghumdependsonthesizeoftheSCApopula%on.Toes%matethenumberofSCAinafield,followthesestepsforscou%ngthefieldandusetheSamplingProtocol(below)and%plantswithaphids(onback)tomaketreatmentdecisions.
FirstDetec6on:IstheFieldatRisk?
1. Onceaweek,startonanyedgeofthefieldandexamine3consecu%veplantsforaphids.Walk5morefeetandsample3moreconsecu%veplants.Thisisequalto1“Stop.”
2. Minimumdistancebetweenstopsshouldbe40-50Sorpaces.Repeatcountsasinpreviousstepforeachstop(total=9),makinga“V”shape.
3. Averagethenumberofaphidsperupperandlowerleavestodeterminethresholdlevelusing54plants. Sorghumfield
NOTPresent?IfnoSCAarepresent,oronlyafewwingless/wingedaphidsareonupperleaves,con%nueonce-a-weekscou%ng(protocolabove).
IfSCAarefoundonlowerorupper-canopyleaves,begintwice-a-weekscou%ng.UsetheSamplingProtocol(above)and%plantswith50-125aphidsperleaf(onback).
Present?
BrianMcCornack,SarahZukoff,J.P.Michaud&JeffWhitworthwww.entomology.ksu.edu/extension
start
or
Sugarcaneaphidlifestages
A
B
C
D
E
Winglessadult
Nymph
Wingedjuvenile
Castskin
Wingedadult
Sugarcaneaphidlifestages
A
B
C
D
E
3consecu%veplants
~5S
Stop#1
#2
#3
#4
#5
#6
#7
#8
#9
Samplingprotocol
SCAThresholdbyGrowthStageEs%matethepercentage(%)ofinfestedplantswith50-125sugarcaneaphids(SCA)perleaftohelp%mefoliarinsec3cide(Sivanto@4oz/acreorTransform@1oz/acre)applica%ons.
SorghumGrowthStage
30%ofplantsinfestedwith50-125perleaf
(onlyspraytopreventissuesduetohoneydew)
Learnmoreaboutsugarcaneaphidandmapitsprogressat:hUp://myfields.info/pests/sugarcane-aphid
Applyinsec%cidewhen Blacklayer20%ofplantsinfestedwith50-125perleaf
SorghumGrowthandDevelopment.MF3234.Dr.Ciampik,Agronomy,K-StateUniversity
EDDMaps.org
(undersideofleaf)
~50aphids
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