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Aminopyralid Injury to Potatoes

Aminopyralid Injury to Potatoes. Kevin B. Kelley and Lloyd C. Haderlie AgraServ, Inc., American Falls, ID. Aminopyralid. Auxinic herbicide labeled for use on rangeland, permanent grass pastures, CRP land, non-cropland areas, and natural areas.

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Aminopyralid Injury to Potatoes

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  1. Aminopyralid Injury to Potatoes Kevin B. Kelley and Lloyd C. Haderlie AgraServ, Inc., American Falls, ID

  2. Aminopyralid • Auxinic herbicide labeled for use on rangeland, permanent grass pastures, CRP land, non-cropland areas, and natural areas. • Very active on several annual and perennial broadleaf weeds, including Canada thistle. • Known to pass through animals that consume treated forage and be present in manure and urine similar to picloram. • Shorter soil half-life than picloram.

  3. Aminopyralid Injury to Potatoes Research Prompted by Farmer Complaints • Aerial applications of aminopyralid to range/pasture in 2008 • Potatoes bordering pasture in 2008 and 2009 showed injury symptoms and yield loss • Weeds sensitive to aminopyralid in potato fields didn’t show injury • Laboratory analysis of potato foliage and tubers resulted in positive detection of aminopyralid

  4. Aminopyralid Affect on Potatoes • Persistence in the soil? • Potato sensitivity? • Growth stage differences? • Daughter tuber response?

  5. Methods - Timing • Fall Soil Carryover • Applied Nov. 7, 2009 • Spring Preplant • Applied May 18, 2010 – One day before planting • In Season • Early – Applied 2 weeks after emergence • Mid-Season – Applied late July near row closure • Daughter Tuber Plant Response • Applied Aug. 31, 2009 • Treated tubers planted May 2010 • Known to be a very sensitive assay for picloram

  6. Methods - Rates • Aminopyralid – Use rate range - 53 to 123 g ai/ha • applied from 44 g ai/ha (~50%) down to 0.044 g ai/ha (0.05%) • Picloram – Average use rate - 280 g ai/ha • applied at 4.4 and 44 g ai/ha • Clopyralid – Max use rate of 280 g ai/ha • applied at 26 or 280 g ai/ha • Dicamba – Average use rate of 560 g ai/ha • applied at 56 or 560 g ai/ha

  7. Fall Soil CarryoverPotato Injury July 16th Percent Injury b b bc c Aminopyralid – g ai/ha LSD – 4 (P=0.1)

  8. Fall Soil CarryoverTotal Potato Yield a a a a a CWT per Acre Aminopyralid – g ai/ha LSD – 41 (P=0.1)

  9. Fall Soil CarryoverUS #1 Potato Yield a a a a b CWT per Acre Aminopyralid – g ai/ha LSD – 37 (P=0.1)

  10. Spring Preplant AppliedPotato Injury Aug 10th a a b b b Percent Injury c cd cd d Aminopyralid Rates in g ai/ha LSD – 17 (P=0.1)

  11. Spring Preplant AppliedTotal Potato Yield a ab bc abc CWT per Acre Aminopyralid Rates in g ai/ha LSD – 78 (P=0.1)

  12. In-Season Applied Potato Injury Aug 10th (6 or 2 WAA) a b c c Percent Injury d de de e f fg fg g g g g g Aminopyralid Aminopyralid Two Weeks After Emergence Near Row Closure Rates in g ai/ha LSD – 6 (P=0.1)

  13. In-Season AppliedUS #1 Potato Yield ab a-e abc a abc a-d a-d b-e a-e cde def ef ef CWT per Acre fg h gh Aminopyralid Aminopyralid Two Weeks After Emergence Near Row Closure Rates in g ai/ha LSD – 71 (P=0.1)

  14. Daughter Tuber Plant Response - Potato Injury Aug 10, 2010 (Sprayed 2009) a Percent Injury b c c c Aminopyralid – g ai/ha LSD – 9 (P=0.1)

  15. Daughter Tuber Plant Response – Total Potato Yield (Sprayed 2009) a a a CWT per Acre b c Aminopyralid – g ai/ha LSD – 67 (P=0.1)

  16. Summary • Aminopyralid injured potatoes and reduced yield and quality following all scenarios tested including fall applied to soil. • Injury levels were similar to or exceeded that caused by picloram • Greater rates of dicamba or clopyralid were required to cause potato injury. • Potatoes appear to be especially sensitive to aminopyralid. • All potatoes were saved for seed grow out in 2011.

  17. Questions?

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