2013 Foliar Fungicide Product Comparison on Corn South

2013 Foliar Fungicide Product Comparison on Corn South Central Agriculture Laboratory Clay Center, NE Tamra Jackson-Ziems Extension Plant Pathologist University of Nebraska - Lincoln

2013 Diseases Although at very low severity, gray leaf spot was the predominant foliar disease during the growing season at this location. Gray leaf spot severity level was < 1% in the nontreated control.

2013 Diseases Common rust was the foliar disease first observed in this trial & was initially seen in late July. Disease severity was very low at this location and did not exceed trace amounts (≤ 0. 1%) for any treatment.

2013 Diseases Southern rust was present and was first identified in this trial on September 4 th. This disease was observed in trace amounts (≤ 0. 2%) in the non-treated control.

2013 Diseases Eyespot, common smut, and Physoderma brown spot were observed sparsely in this trial, thus not justifying ratings for these diseases at this location in 2013.

2013 Hail Damage On August 1 st, a storm event with strong wind and hail occurred when the corn was at the end of the R 1 growth stage which caused an estimated 30% defoliation. Foliar fungicide treatments were applied on July 26 th, six days prior to the event.

2013 Foliar Fungicide Trials • Last year’s crop was corn • Planting date: 5/15/13 • Target plant population of 31, 763 plants/A • Corn hybrid: NK N 68 B (GLS rating 7/9, ”fair”, not rated for CR, & SR rating 2/9, “excellent”) 2005 -2006 • Eight foliar fungicide treatments and a non-treated control replicated six times • NIS added at 0. 25% v/v • High clearance sprayer used at 20 gpa at 40 psi • Alley width & row spacing = 30 inches South Central Agriculture Laboratory Clay Center, NE • Overhead sprinkler irrigated

2013 Fungicide Product Comparison Trial in NE Disease Severity % (% total leaf area coverage) Gray leaf spot disease severity (%) 5 Treatment & application rate 4 Non-treated control Headline AMP, 10 fl oz/A Priaxor, 4 fl oz/A 3 Quilt Xcel, 10. 5 fl oz/A Stratego YLD, 4 fl oz/A 2 Aproach, 6 fl oz/A Aproach, 5. 6 fl oz/A + Alto 5. 6 fl oz/A Fortix, 6 fl oz/A 1 0 7/26/2013 Rating Date & Growth Stage • • R 1 8/22/2013 R 4 9/4/2013 R 5. 33 Foliar fungicide application was made July 26 th at silking (R 1). NIS added to each fungicide treatment at 0. 25% v/v.

2013 Fungicide Product Comparison Trial in NE Area Under the Disease Progress Curve (AUDPC) for gray leaf spot 15 a 7. 3 4 5 6 7 b 3. 8 8 Fortix 6 fl oz/A b 4. 4 Aproach 5. 6 fl oz/A + Alto 5. 6 fl oz/A 3 b 4. 4 Aproach 6 fl oz/A 2 b 4. 5 Stratego YLD 4 fl oz/A Treatment & application rate 1 Headline AMP 10 fl oz/A 0 3. 5 b 4. 4 Quilt Xcel 10. 5 fl oz/A 5 b 3. 6 Priaxor 4 fl oz/A b ab 6. 2 9 Evito 2 fl oz/A 10 Non-treated control Gray Leaf Spot AUDPC 20 * Foliar fungicide applications made at silking (R 1). NIS added at 0. 25% v/v. * Treatments with different letters are statistically different. Coefficient of variation is 42. 8%.

2013 Fungicide Product Comparison Trial in NE Common rust disease severity (%) Treatment & application rate Disease Severity % (% total leaf area coverage) 5 4 Non-treated control Headline AMP, 10 fl oz/A Priaxor, 4 fl oz/A 3 2 Quilt Xcel, 10. 5 fl oz/A Stratego YLD, 4 fl oz/A 1 Aproach, 6 fl oz/A 0 7/26/2013 R 1 -1 8/22/2013 R 4 9/4/2013 R 5. 33 -2 Rating Date & Growth Stage • • Foliar fungicide application was made July 26 th at silking (R 1). NIS added to each fungicide treatment at 0. 25% v/v. Aproach, 5. 6 fl oz/A + Alto 5. 6 fl oz/A Fortix, 6 fl oz/A

2013 Fungicide Product Comparison Trial in NE Area Under the Disease Progress Curve (AUDPC) for common rust 15 10 4. 0 1 2 3 4 5 6 7 8 9 * Foliar fungicide applications made at silking (R 1). NIS added at 0. 25% v/v. * No statistical differences among treatments. Coefficient of variation is 0%. Evito 2 fl oz/A 4. 0 Fortix 6 fl oz/A 4. 0 Aproach 5. 6 fl oz/A + Alto 5. 6 fl oz/A 4. 0 Aproach 6 fl oz/A 4. 0 Stratego YLD 4 fl oz/A 4. 0 Quilt Xcel 10. 5 fl oz/A Treatment & application rate 4. 0 Priaxor 4 fl oz/A 0 4. 0 Headline AMP 10 fl oz/A 5 Non-treated control Common Rust AUDPC 20

2013 Fungicide Product Comparison Trial in NE Southern rust disease severity (%) Treatment & application rate Disease Severity % (% total leaf area coverage) 5 Non-treated control 4 Headline AMP, 10 fl oz/A Priaxor, 4 fl oz/A 3 Quilt Xcel, 10. 5 fl oz/A Stratego YLD, 4 fl oz/A 2 Aproach, 6 fl oz/A Aproach, 5. 6 fl oz/A + Alto 5. 6 fl oz/A Fortix, 6 fl oz/A 1 0 7/26/2013 Rating Date & Growth Stage • • R 1 8/22/2013 R 4 9/4/2013 R 5. 33 Foliar fungicide application was made July 26 th at silking (R 1). NIS added to each fungicide treatment at 0. 25% v/v.

2013 Fungicide Product Comparison Trial in NE Area Under the Disease Progress Curve (AUDPC) for southern rust 4 3 a 3 4 5 6 0. 7 b 0. 7 7 8 9 Evito 2 fl oz/A 2 b Fortix 6 fl oz/A b 0. 7 Aproach 5. 6 fl oz/A + Alto 5. 6 fl oz/A 0. 8 Aproach 6 fl oz/A Treatment & application rate 1 b 0. 7 Stratego YLD 4 fl oz/A 0 b 0. 7 Quilt Xcel 10. 5 fl oz/A 1 b b 0. 7 Priaxor 4 fl oz/A 1. 1 Headline AMP 10 fl oz/A 2 Non-treated control Southern Rust AUDPC 5 * Foliar fungicide applications made at silking (R 1). NIS added at 0. 25% v/v. * Treatments with different letters are statistically different. Coefficient of variation is 27. 6%.

2013 Fungicide Product Comparison Trial in NE Stay green % assessed on September 30 th, 2013 Kernel dent stage (R 6) Stay Green % 100 80 60 53. 5 55. 6 56. 9 55. 6 51. 4 56. 9 54. 9 55. 6 50. 7 40 20 * Foliar fungicide applications made at silking (R 1). NIS added at 0. 25% v/v. * No statistical differences among treatments. Coefficient of variation is 12. 9%. 9 Evito 2 fl oz/A 8 Fortix 6 fl oz/A 7 Aproach 5. 6 fl oz/A + Alto 5. 6 fl oz/A 6 Aproach 6 fl oz/A 5 Stratego YLD 4 fl oz/A 4 Quilt Xcel 10. 5 fl oz/A 3 Priaxor 4 fl oz/A 2 Headline AMP 10 fl oz/A Treatment & application rate 1 Non-treated control 0

2013 Fungicide Product Comparison Trial in NE Push lodging % assessed on October 16 th, 2013 Physiological maturity stage (R 6) 20 15 10 6. 7 0. 8 5 6 Aproach 6 fl oz/A 4 0. 8 Stratego YLD 4 fl oz/A 3 Priaxor 4 fl oz/A 2 Headline AMP 10 fl oz/A Treatment & application rate 1 Non-treated control 0 3. 3 7 1. 7 8 * Foliar fungicide applications made at silking (R 1). NIS added at 0. 25% v/v. * No statistical differences among treatments. Coefficient of variation is 159. 7%. 2. 5 9 Evito 2 fl oz/A 1. 7 2. 5 Fortix 6 fl oz/A 3. 3 Aproach 5. 6 fl oz/A + Alto 5. 6 fl oz/A 5 Quilt Xcel 10. 5 fl oz/A Push Lodging % 25

2013 Fungicide Product Comparison Trial in NE 500 count kernel weight (g) 155. 1 154. 4 156. 7 152. 7 156. 8 156. 2 156. 9 156. 5 153. 4 150 100 50 8 * Foliar fungicide applications made at silking (R 1). NIS added at 0. 25% v/v. * No statistical differences among treatments. Coefficient of variation is 2. 4%. 9 Evito 2 fl oz/A 7 Fortix 6 fl oz/A 6 Aproach 5. 6 fl oz/A + Alto 5. 6 fl oz/A 5 Aproach 6 fl oz/A 4 Stratego YLD 4 fl oz/A 3 Priaxor 4 fl oz/A 2 Quilt Xcel 10. 5 fl oz/A Treatment & application rate 1 Headline AMP 10 fl oz/A 0 Non-treated control 500 Count Kernel Weight (g) 200

2013 Fungicide Product Comparison Trial in NE Yield (bu/A) on October 23 rd, 2013 300 Yield (bu/A) 250 200 cd 201 ab 208 a 210 d 197 ab abc 209 207 a 212 ab 209 bcd 203 150 100 50 9 Evito 2 fl oz/A 8 Fortix 6 fl oz/A 7 Aproach 5. 6 fl oz/A + Alto 5. 6 fl oz/A 6 Aproach 6 fl oz/A 5 Stratego YLD 4 fl oz/A 4 Quilt Xcel 10. 5 fl oz/A 3 Priaxor 4 fl oz/A 2 Headline AMP 10 fl oz/A Treatment & application rate 1 Non-treated control 0 * Foliar fungicide applications made at silking (R 1). NIS added at 0. 25% v/v. * Treatments with different letters are statistically different. Coefficient of variation is 2. 5%.

2013 Fungicide Product Comparison Trial in NE Grain moisture % at harvest on October 23 rd, 2013 20 16. 8 17. 0 16. 9 16. 8 16. 9 6 7 16. 8 17. 0 15 10 * Foliar fungicide applications made at silking (R 1). NIS added at 0. 25% v/v. * No statistical differences among treatments. Coefficient of variation is 2. 0%. 9 Evito 2 fl oz/A 8 Fortix 6 fl oz/A 5 Aproach 5. 6 fl oz/A + Alto 5. 6 fl oz/A 4 Stratego YLD 4 fl oz/A 3 Priaxor 4 fl oz/A 2 Quilt Xcel 10. 5 fl oz/A Treatment & application rate 1 Headline AMP 10 fl oz/A 0 Aproach 6 fl oz/A 5 Non-treated control Grain Moisture % 17. 0

Acknowledgments • Casey Schleicher, Technologist • UNL South Central Ag Lab (SCAL) Staff • UNL Student Workers

Department of Plant Pathology University of Nebraska-Lincoln Institute of Agriculture and Natural Resources