Pesticide Residues in/on Blueberries After Commercial Mistigation and Airblast Applications

Transcription

1 Pesticide Residues in/on Blueberries After Commercial Mistigation and Airblast Applications PIs: Lynell K. Tanigoshi 1, Beverly S. Gerdeman 1 and Wei Yang 2 1 WSU Mount Vernon Northwestern Washington Research & Extension Center 2 North Willamette Research and Extension Center, Aurora, OR Collaborations: Steve Erickson, and Lance Fritz PanAmerican Berry Growers, Salem OR Vince Hebert/Jane LePage Food and Environmental Quality Laboratory WSU-Tri Cities, Richland WA

2 With only a handful of reliable tools, spray programs have to be finely tuned for SWD control while assuring compliance with international maximum residue levels (MRLs) 2013 MRL Study Objectives Evaluate pesticide residue decline after mistigation and airblast applications: Our purpose: 1) To aid growers by charting field residue decline spanning the blueberry harvest season 1. Malathion (Malathion 8) 1.25 pts 100 GPA; 1 Day PHI 2. Zeta-cypermethrin (Mustang Max) 4.0 fluid oz 100 GPA;1 Day PH 2) compare side-by-side pesticide residues in/on blueberries by two commercial application practices 3. Fenpropathrin (Danitol) 16 fluid oz in 100 GPA; 3Day PHI We also monitored season-long residues Phosmet (Imidan 70 W) 1.33 lbs 100 GPA

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4 Scope of 2013 field-analytical research SWD Spray Program and Sampling Events Treatment Insecticide Application Interval Sampling Week 1 Malathion -1 through 14 DAT* Week 2 Mustang Max -1 through 14 DAT Week 3 Malathion -1 through 14 DAT Week 4 Mustang Max -1 through 14 DAT Last week Danitol** -1 through 24 DAT * DAT = Days after treatment ** Airblast application was solely evaluated for danitol decline Duplicate sampling was performed at mistigation and airblast treatment blocks for each interval sampling event (32 total intervals) Control samples were taken from an untreated block on each interval date A total of 148 multiresidue determinations were performed to construct residue decline with ridged quality control

5 2013 MRL Spray-Collection Program Sun Mon Tues Wed Thu Fri Sat M0 July 28 M1 July 29 M2 M3 July 31 August 1 M5 2 MM-1 3 First Malathion app M7, MM0 4 MM1 5 6 MM3, M10M7 8 MM5 9 M13 10 First Mustang Max App M-1 MM7, M0 11 M1 12 M2 13 M3 MM M5 16 MM13-17 M-1 Second Malathion app M7,,MM0 18 MM MM3, M MM Second Mustang Max App MM7, M MM D-1 31 D0,MM14 Spt1 D1 Sept 2 Sept 3 D3 Sept 4 Sept 5 D5 Sept 6 Sept 7 Danitol App D7 Sept 8 D10 Sept 11 D14 Sept 15

6 So, how s can residue decline information help the grower? MRLs (in ppm) US = 8 Korea = 10 Taiwan = 0.1 Malathion (ppm) Japan 0.5 ppm MRL Delay picking at 1-Day PHI Field Control (ppm) Mistigation-T (ppm) Mistigation-TD (ppm) Airblast-T (ppm) Airblast-TD (ppm) Lab Fortified Recovery % (n =38) Level of Quantitation > 0.05ppm Malathion Applications

7 * Monitoring malathion in airblast, control plots post application study through 48 days Malathion (ppm) Field Control (ppm) Mistigation-T (ppm) Mistigation-TD (ppm) Airblast-T (ppm) Airblast-TD (ppm) * Haviland D. Beers E Chemical Control Programs for Drosophila suzukii that Comply With International Limitations on Pesticide Residues for Exported Sweet Cherries. J Integ. Pest. Manag.

8 MRLs (in ppm) US = 8; Korea = 10 Japan = 0.5; Taiwan = no tolerance Field Control (ppm) Mistigation-T (ppm) Mistigation-TD (ppm) zeta-cypermethrin (ppm) * Airblast-T (ppm) Airblast-TD (ppm) Lab Fortified Recovery % (n = 34) Level of Quantitation = 0.05 ppm) Mustang Max Applications * Haviland D. Beers E Chemical Control Programs for Drosophila suzukii that Comply With International Limitations on Pesticide Residues for Exported Sweet Cherries. J Integ. Pest. Manag.

9 MRLs (in ppm) US = 3; Korea = 0.5; Japan = 5; Taiwan = 3 Fenpropathrin (ppm) Field Control (ppm) Mistigation-T (ppm) Mistigation-TD (ppm) Airblast-T (ppm) Airblast-TD (ppm) Danitol Application Lab Fortified Recovery % (n = 16) Level of Quantitation > 0.05ppm) * Haviland D. Beers E Chemical Control Programs for Drosophila suzukii that Comply With International Limitations on Pesticide Residues for Exported Sweet Cherries. J Integ. Pest. Manag.

10 Season-long Residue Profile Pesticide (ppm) Malathion Mistigation (ppm) Phosmet mistigation (ppm) Zeta-cypermethrin mistigation (ppm) Malathion Airblast (ppm) Phosmet airblast (ppm) Zeta-cypermethring airblast (ppm) Danitol airblast (ppm) Date

11 Summary of 2013 Highbush Pesticide Residues At commercial application rates, Berry residue concentrations were consistently higher with airblast than mistigation Pesticide residues for the thre evaluated active ingredients can sometimes exceed MRLs for markets in certain Pacific Rim exporting countries Field decline at similar rates for these active ingredients behaves closely to other PNW small fruits The decline data also suggest Harvest a little later than the label specified PHIs for certain active ingredients Consider season-long residual pesticide field concentrations as part of the SWD spray management program Start and finish the spray season with a longer-lasting active ingredient

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13 Pesticide Residues in/on Blueberries After Commercial Mistigation and Airblast Applications PIs: Lynell K. Tanigoshi 1, Beverly S. Gerdeman 1 and Wei Yang 2 1 WSU Mount Vernon Northwestern Washington Research & Extension Center 2 North Willamette Research and Extension Center, Aurora, OR Collaborations: Steve Erikson, PanAmerican Berry Growers, Salem OR Vince Hebert/Jane LePage Food and Environmental Quality Laboratory WSU-Tri Cities, Richland WA