Onion Thrips Control using Carzol SP® at 3 action thresholds Onion ...
Onion Thrips Control using Carzol SP® at 3 action thresholds Onion ...
Onion Thrips Control using Carzol SP® at 3 action thresholds Onion ...
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Managing InsecticideResistance in <strong>Onion</strong> <strong>Thrips</strong>Wisconsin Fertilizer, Aglime andPest Management ConferenceVegetable Crop ManagementJanuary 18, 2007Russell L. GrovesDepartment of EntomologyUniversity of Wisconsin1630 Linden DriveMadison, WI 53706
The problem and the pest…<strong>Onion</strong> <strong>Thrips</strong> DamageProtected withinsecticidesAdultLarvaNot protected<strong>Onion</strong> <strong>Thrips</strong>,<strong>Thrips</strong> tabaci Lindeman
Biological <strong>at</strong>tributes th<strong>at</strong> make onionthrips a pest‣ Short developmental time‣ Parthenogenic (do not need to find a m<strong>at</strong>e)‣ Highly mobile‣ Wide host range‣ Overwinter adjacent to onion‣ Capability of developingresistance to insecticides
LC 50 (ppm)<strong>Onion</strong> thrips resistance to Warrior ®λ-cyhalothrin (New York)2001 TIBS Bioassays among popul<strong>at</strong>ions110010009008007006005004003002001003.2 fl oz/AShelton et al. (2003)0OR1 OR3 OR4 WA1 WA2 PO1 PO3 PO4 EL1 EL2 EL4 OS1 OS2 ST1 ST2 ST6Popul<strong>at</strong>ion
TIBS Survey for InsecticideResistance‣ Expose thrips to insecticides in the lab to avoid issuessuch as:W<strong>at</strong>er + sugar(1) inadequ<strong>at</strong>e spray coverage(2) environmental conditionsth<strong>at</strong> could affect controlInsecticide20 larvae
Foliar-Applied InsecticidesEvalu<strong>at</strong>ed in 2006Product Active Ingredient R<strong>at</strong>e (amnt/acre)Warrior lambda-cyhalothrin 3.8 fl ozLann<strong>at</strong>e LV methomyl 48 fl ozSpinTor 2SC spinosad 6 fl oz*<strong>Carzol</strong> SP formetan<strong>at</strong>e hydrocloride 0.75, 1 and 1.5 lbsRadiant SC spinetoram 7 fl ozAgri-Mek 0.15EC abamectin 10 fl ozNote: Products highlighted in yellow were labeled on onion in WI in2006; *<strong>Carzol</strong> was permitted for use in NY and OR under a CrisisExemption, and in MI and CO under a Section 18.Nault (2006) Arth. Mgmt. Tests
Mean number of larvae/plantFoliar-Applied Insecticides for <strong>Onion</strong> <strong>Thrips</strong><strong>Control</strong>10090807060aaNote: Plots sprayed on 7/18, 7/24and 7/31 @ threshold of 3 thrips/leaf.WI Registr<strong>at</strong>ionNon-registered5040302010bcbcd d d d0Tre<strong>at</strong>ment
SummaryFoliar-Applied Insecticides‣ <strong>Onion</strong>s were best protected from onion thripsdamage <strong>using</strong> <strong>Carzol</strong> and Radiant‣ SpinTor, Agri-Mek and Lann<strong>at</strong>e provided adequ<strong>at</strong>eor nearly adequ<strong>at</strong>e levels of protection‣ Warrior failed to control thrips‣ Highly efficacious insecticides must be registeredsoon in WI to prevent further thrips outbreaks
Environmental EffectsHot and Dry Conditions, 2006
<strong>Onion</strong> thrips survival, fecundity, andgener<strong>at</strong>ion time(s) <strong>at</strong> varyingtemper<strong>at</strong>uresDaysFactor 68 0 F 77 0 F 86 0 FSurvival 47 25 13Eggs laid/ female 210 165 63Gener<strong>at</strong>ion time 48 30 17Murai (2000)
Murai (2000)<strong>Onion</strong> thrips popul<strong>at</strong>ion growth(68 o F)Number of FemalesD<strong>at</strong>e68 0 FJuly 1 1July 8July 15July 22July 29August 5August 12August 19 210August 26September 2Number gener<strong>at</strong>ions 1
<strong>Onion</strong> thrips popul<strong>at</strong>ion growth(77 o F)Number of FemalesD<strong>at</strong>e 68 0 F 77 0 FJuly 1 1 1July 8July 15July 22July 29 165August 5August 12August 19 210August 26September 2 27,225Number gener<strong>at</strong>ions 1 2Murai (2000)
<strong>Onion</strong> thrips popul<strong>at</strong>ion growth(86 o F)Number of FemalesD<strong>at</strong>e 68 0 F 77 0 F 86 0 FJuly 1 1 1 1July 8July 15 63July 22July 29 165 3,969August 5August 12 250,047August 19 210August 26 15,752,961September 2 27,225Number gener<strong>at</strong>ions 1 2 4Murai (2000)
Spray Coverage an Issue??
Adjusting Action Thresholds??B. Nault, 2007 Pacific Northwest Vegetable Associ<strong>at</strong>ionConference & Trade ShowProduct Action Threshold R<strong>at</strong>e (amnt/acre)Warrior 1 larva/leaf 3.8 fl ozWarrior* 3 larvae/leafWarrior5 larvae/leaf<strong>Carzol</strong> SP 1 larva/leaf 0.75 lb<strong>Carzol</strong> SP * 3 larvae/leaf<strong>Carzol</strong> SP5 larvae/leaf* Current onion thrips management <strong>action</strong> threshold, Michigan St<strong>at</strong>e University
Mean larvae / plantharvestMean larvae / plantharvestMean larvae / plantharvest<strong>Onion</strong> <strong>Thrips</strong> <strong>Control</strong> <strong>using</strong> Warrior ®<strong>at</strong> 3 <strong>action</strong> <strong>thresholds</strong>302520151050Action threshold = 17/18 7/25 8/1 8/8 8/15302520151050Action threshold = 37/18 7/25 8/1 8/8 8/15302520151050Action threshold = 57/18 7/25 8/1 8/8 8/15Untre<strong>at</strong>ed1 larva/leaf3 larvae/leaf5 larvae/leaf
Mean larvae / plantharvestMean larvae / plantharvestMean larvae / plantharvest<strong>Onion</strong> <strong>Thrips</strong> <strong>Control</strong> <strong>using</strong> <strong>Carzol</strong>SP ® <strong>at</strong> 3 <strong>action</strong> <strong>thresholds</strong>252520151020151055Action threshold = 1 Action threshold = 3007/18 7/25 8/1 8/8 8/157/18 7/25 8/1 8/8 8/15252015105Action threshold = 507/18 7/25 8/1 8/8 8/15Untre<strong>at</strong>ed1 larva/leaf3 larvae/leaf5 larvae/leaf
Action Thresholds Summary‣ Combin<strong>at</strong>ion of insecticide product and <strong>action</strong>threshold used to time sprays affects control‣ Warrior failed, regardless of the <strong>action</strong>threshold‣ <strong>Carzol</strong> sprayed <strong>at</strong> 1 and 3 thrips/leaf providedexcellent control; *only 1 spray required <strong>at</strong> the3 thrips/leaf threshold‣ Spraying <strong>at</strong> 5 thrips/leaf allowed too muchdamage
Insecticide control failures could bereduced by:1. Monitoring onion thrips popul<strong>at</strong>ions forresistance2. Using a nozzle and gallonage th<strong>at</strong> provides bettercoverage3. Using insecticides belonging to new classes4. Adopting insecticide resistance management –rot<strong>at</strong>ing classes of chemistry
Questions?
Change language