2011 Early Season Foliar Fungicide Timing Trial on Corn
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1 2011 Early Season Foliar Fungicide Timing Trial on Corn South Central Ag L Clay Center, NE Tamra Jackson Extension Plant Pathologist University of Nebraska - Lincoln
2 2011 Diseases Gray leaf spot was the predominant foliar disease during the growing season at this location. Gray leaf spot severity levels were very low (< 1.8%) and reached the ear leaf by early August.
3 2011 Diseases Common rust was the foliar disease first observed in this trial & was initially seen in early July. Disease severity was very low at this location (<0.5%) due likely in part to the hybrid used having an excellent rating.
4 2011 Diseases Southern rust was present and was first identified in this trial on August 24 th. This disease was observed in trace amounts (<0.15%).
5 2011 Diseases Eyespot, common smut, holcus spot and Physoderma brown spot were also present in this trial, but at very low incidence and severity levels, thus not justifying ratings for these diseases at this location in 2011.
6 2011 Foliar Fungicide Trials South Central Ag L, Clay Center, NE High clearance sprayer used Previous year s crop was soybean Corn hybrid: DKC (GLS rating 6/9, good & CR rating 2/9, excellent ) Planting date: 5/3/11 Target plant population of 32,000 plants/a Seven foliar fungicide treatments plus a non-treated control NIS added at 0.25% v/v Alley width & row spacing = 30 inches Overhead sprinkler irrigated 6 reps, 20 gpa at 40 psi
7 Gray leaf spot disease severity (%) 5 rate & timing Disease Severity % (% total leaf area coverage) Non-treated control, 2 fl oz/a,,, 2 fl oz/a, fb Headline EC, 6 fl oz/a, Headline AMP, 10 fl oz/a, Quilt,, 0 Rating Date & Growth Stage 7/5/2011 V14 7/13/2011 8/1/2011 R3 8/10/2011 R4 8/24/2011 R5 (milk line 1/3rd from kernel top) Quilt Xcel,, * NIS added to each treatment at 0.25% v/v.
8 Area Under the Disease Progress Curve (AUDPC) for gray leaf spot 40 a Gray Leaf Spot AUDPC b 21.9 cd 13.0 d 11.8 bc b rate & timing 0 Non-treated control 2 fl oz/a 4 fl oz/a 2 fl oz/a, fb * NIS added to each treatment at 0.25% v/v. Headline EC 6 fl oz/a Headline AMP 10 fl oz/a Quilt * Treatments with different letters are statistically different. Coefficient of variation is 29.1%. Quilt Xcel
9 Common rust disease severity (%) 5 rate & timing Disease Severity % (% total leaf area coverage) Rating Date & Growth Stage 7/5/2011 V14 7/13/2011 8/1/2011 R3 8/10/2011 R4 8/24/2011 R5 (milk line 1/3rd from kernel top) Non-treated control, 2 fl oz/a,,, 2 fl oz/a, fb Headline EC, 6 fl oz/a, Headline AMP, 10 fl oz/a, Quilt,, Quilt Xcel,, * NIS added to each treatment at 0.25% v/v.
10 Area Under the Disease Progress Curve (AUDPC) for common rust 20 Common Rust AUDPC a b rate & timing 0 Non-treated control 2 fl oz/a 4 fl oz/a 2 fl oz/a, fb * NIS added to each treatment at 0.25% v/v. Headline EC 6 fl oz/a Headline AMP 10 fl oz/a Quilt Quilt Xcel * Treatments with different letters are statistically different. Coefficient of variation is 26.9%.
11 Gray leaf spot progression up the plant (Ear leaf = Leaf #13, Flag leaf = Leaf #19) Leaf Number (Leaf # from plant base) August 10 th, 2011 rating date (kernel dough stage, R4) Flag Leaf = Leaf #19 a a Ear Leaf = Leaf #13 b a a a 15.0 rate & timing 0 Non-treated control 2 fl oz/a 2 fl oz/a, fb 4 fl oz/a * NIS added to each treatment at 0.25% v/v. Headline EC 6 fl oz/a Headline AMP 10 fl oz/a Quilt * Treatments with different letters are statistically different. Coefficient of variation is 4.8%. Quilt Xcel
12 Stay green % assessed on September 19 th, 2011 Kernel dent stage (R5, milk line 2/3 rd from kernel top) Stay Green % c c a 29.5 c 24.1 c 21.6 bc 25.0 c rate & timing 0 Non-treated control 2 fl oz/a 4 fl oz/a 2 fl oz/a, fb Headline EC 6 fl oz/a * NIS added to each treatment at 0.25% v/v. Headline AMP 10 fl oz/a Quilt * Treatments with different letters are statistically different. Coefficient of variation is 11.7%. Quilt Xcel
13 Push lodging % assessed on October 7 th, Physiological maturity stage (R6) 8 Push Lodging % rate & timing 0 Non-treated control 2 fl oz/a 4 fl oz/a 2 fl oz/a, fb * NIS added to each treatment at 0.25% v/v. Headline EC 6 fl oz/a Headline AMP 10 fl oz/a Quilt * Assessment defined as the percentage of 20 stalks lodged below the ear node and do not return to a standing position after being pushed to arms length. No statistical differences between treatments. Coefficient of variation is 161.4%. Quilt Xcel
14 count kernel weight (g) 500 Count Kernel Weight (g) rate & timing Non-treated control 2 fl oz/a 4 fl oz/a 2 fl oz/a, fb * NIS added to each treatment at 0.25% v/v. Headline EC 6 fl oz/a Headline AMP 10 fl oz/a * No statistical differences between treatments. Coefficient of variation is 2.6%. Quilt Quilt Xcel
15 Grain moisture % at harvest on October 20 th, Grain Moisture % rate & timing Non-treated control 2 fl oz/a 4 fl oz/a 2 fl oz/a, fb * NIS added to each treatment at 0.25% v/v. Headline EC 6 fl oz/a Headline AMP 10 fl oz/a * No statistical differences between treatments. Coefficient of variation is 2.4%. Quilt Quilt Xcel
16 Yield (bu/a) on October 20 th, Yield (bu/a) d 238 cd 241 c 248 a cd 240 bcd 244 d rate & timing Non-treated control 2 fl oz/a 4 fl oz/a 2 fl oz/a, fb Headline EC 6 fl oz/a * NIS added to each treatment at 0.25% v/v. Headline AMP 10 fl oz/a Quilt * Treatments with different letters are statistically different. Coefficient of variation is 3.0%. Quilt Xcel
17 Acknowledgments Casey Schleicher, Technologist Jae Behn, Technologist Kim Miller, Technician UNL South Central Ag L (SCAL) Staff UNL Student Workers
18 Department of Plant Pathology University of Nebraska-Lincoln Institute of Agriculture and Natural Resources
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