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Corn: Fungicide Question

Corn: Fungicide Question. Industry is promoting foliar fungicides Application near VT Guaranteeing yields in some cases. Strobilurin fungicides labeled for corn. Headline (pyraclostrobin) Quadris (azoxystrobin) Quilt (premix of azoxystrobin and propiconazole)

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Corn: Fungicide Question

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  1. Corn: Fungicide Question • Industry is promoting foliar fungicides • Application near VT • Guaranteeing yields in some cases

  2. Strobilurin fungicides labeled for corn • Headline (pyraclostrobin) • Quadris (azoxystrobin) • Quilt (premix of azoxystrobin and propiconazole) • Stratego (premix of trifloxystrobin and propiconazole)

  3. For which diseases? Northern leaf blight Gray leaf spot Image by K. Leonard and E. G. Suggs Courtesy of the American Phytopathological Society Both survive in infested corn residue.

  4. 200 bu/acre Pioneer 31D61 (YGCB) NLB rating = 4 (where 1 = susc., 9 = highly resist.) No fungicide treatment Muhlenberg County Photo taken: Sept. 30, 2007

  5. 270 bu/acre Pioneer 31D61 (YGCB) NLB rating = 4 (where 1 = susc., 9 = highly resist.) Fungicide treatment Muhlenberg County Photo taken: Sept. 30, 2007

  6. Corn: Fungicides • Replicated Trials • Logan County (Hybrid Testing Program) • Spindletop Farm

  7. Hybrids selected for 2007 trials †All ratings were provided by the company. 1-2 = Excellent, 3-4 = Very Good, 5-6 = Good, 7-8 = Fair, 9 = Poor

  8. Other key information on 2007 trials

  9. Corn Fungicides

  10. Logan County results, 2007

  11. Spindletop Farm results, 2007

  12. Corn Fungicides • Leaf diseases: NS • Ear diseases: NS

  13. Corn Fungicides: Farmer Testing

  14. Farmer Testing Quilt at 14 oz/acre + Warrior at 3.5 oz/acre

  15. Susceptible hybrid Continuous corn No-till Late planting High yield potential Irrigation Disease activity at tasseling Disease-favorable weather Climbing the “Probability Ladder”: Factors that increase the probability of higher yield from fungicides on corn High probability Low probability

  16. Corn Fungicides • Just getting started on the research. • Will be a major question for extension this winter and for the next growing season.

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