Alyssa Koehler, Extension Field Crops Pathologist
University of Delaware
Carvel Research and Education Center Georgetown, DE
2020 Irrigated Corn Fungicide Trial – Rotated Field
Variety: Hubner H6187RCSS | Planting Date: 5/14/20 | Harvest Date: 9/15/20 | Planting Population: 32,000 sd/A
|
Treatmentz |
% GLS Incidence 14 daay | % GLS Severity 14daax | % GLS Severity 28 daa | % GLS Severity 42 daa | Canopeo green canopy cover
49 daa |
Moisture | Test Weight | Yieldw |
| Veltyma (R1)
7 oz/a |
24.0 ab | 0.24 ab | 0.48 ab | 1.10 abc | 47.2 ab | 22.8 a | 52.5 abc | 227.2 a |
| Headline AMP (R1)
10 oz/a |
22.0 ab | 0.22 ab | 0.52 bc | 1.48 d | 43.4 bc | 22.8 a | 52.7 bc | 232.3 a |
| Priaxor (R1)
4 oz/a |
24.0 ab | 0.24 ab | 0.50 ab | 1.36 bcd | 43.7 abc | 22.9 a | 52.6 bc | 227.8 a |
| USF0411 (R1)
8 oz/a |
30.0 b | 0.30 b | 0.54 b | 0.88 a | 49.8 a | 23.3 a | 52.5 abc | 228.6 a |
| Topguard EQ(R1)
5 oz/a |
22.0 ab | 0.24 ab | 0.52 ab | 1.30 bcd | 46.0 ab | 23.0 a | 52.6 bc | 229.4 a |
| Lucento (R1)
5 oz/a |
22.0 ab | 0.22 ab | 0.48 ab | 1.04 ab | 48.0 ab | 23.0 a | 52.3 ab | 231.8 a |
| Trivapro (V8) fb Miravis Neo (R1)
13.7 +13.7 oz/a |
16.0 a | 0.18 ab | 0.50 ab | 1.36 bcd | 48.3 ab | 23.6 a | 52.2 ab | 230.1 a |
| Trivapro (R1)
13.7 oz/a |
24.0 ab | 0.24 ab | 0.52 ab | 1.34 bcd | 43.7 abc | 23.1 a | 52.5 abc | 230.0 a |
| Trivapro (V8) (3 reps) 13.7 oz/a | 30.0 b | 0.30 b | 0.50 ab | 1.23 a-d | 38.8 c | 22.8 a | 52.8 c | 220.2 a |
| Miravis Neo (V8)
13.7 oz/a |
20.0 ab | 0.20 ab | 0.52 ab | 1.42 cd | 39.3 c | 22.8 a | 52.8 c | 224.8 a |
| Miravis Neo (R1)
13.7 oz/a |
14.0 a | 0.14 a | 0.46 a | 1.30 bcd | 46.2 ab | 23.3 a | 52. 1 a | 228.4 a |
| Control | 86.0 c | 0.88 c | 0.70 c | 2.50 e | 39.5 c | 22.7 a | 52.9 c | 218.1 a |
| p-value | 0.0001 | 0.0001 | 0.0001 | 0.0001 | 0.007 | 0.108 | 0.05 | 0.315 |
| LSD (α=0.05) | 12.16 | 0.13 | 0.07 | 0.36 | 6.05 | 0.57 | 0.47 | 10.75 |
z V8 applied 6/24/20, R1 applied 7/14/20 using a Co2 pressurized backpack sprayer equipped with TP8002-VS flat fan nozzle nozzles calibrated to deliver 20 GPA at 40 psi with plots set up in RCBD with five replications. All treatments included 0.125% non-ionic surfactant, Induce.
y Disease incidence was rated as percentage of 10 ear leaves with grey leaf spot lesions caused by Cercospora zeae-maydis. Means followed by the same letter are not significantly different based on Fisher’s Least Significant Difference (LSD; α=0.05).
x Grey leaf spot severity was visually assessed as the average % ear leaf covered in lesions per plot; means of 10 leaves per plot were used for analysis.
w Yield was calculated from the center two rows of each plot and adjusted to 15.5% moisture.
Warrington Irrigation Farm: 2020
Irrigated Corn Fungicide Trial – Corn on Corn
Variety: Axis 64K24 | Planting Date: 5/11/20 | Harvest Date: 10/6/20 | Planting Population: 34,000 sd/A
| Treatmentz | Avg % GLS Incidence 14 daay | Avg % GLS Severity 14daax | Avg % GLS Severity
28 daa |
Avg % GLS Severity
42 daa |
Avg % Curvularia Severity
42 daaw |
Canopeo green canopy cover
42 daa |
% Lodging
72 daa |
Test Weight | Moisture | Yieldv |
| Veltyma (R1)
7 oz/a |
8.0 a | 0.08 a | 0.88 a | 2.28 c | 8.87 abcd | 42.4 cd | 6.0 ab | 57.0 ab | 20.26 abcd | 218.8 a |
| Headline AMP (R1)
10 oz/a |
18.0 abc | 0.18 abc | 1.00 a | 2.02 abc | 9.22 bcd | 44.0 bcd | 6.0 ab | 57.0 ab | 19.90 bcd | 228.4 a |
| Priaxor (R1)
4 oz/a |
14.0 ab | 0.14 ab | 0.98 a | 2.18 bc | 9.14 bcd | 40.9 d | 8.0 ab | 57.2 ab | 19.80 de | 220.9 a |
| Revytek (R1)
8 oz/a |
16.0 abc | 0.16 ab | 0.84 a | 1.56 abc | 7.72 a | 47.7 abcd | 2.0 ab | 56.2 c | 20.38 ab | 228.7 a |
| USF0411 (R1)
8 oz/a |
16.0 abc | 0.16 ab | 0.86 a | 1.20 a | 7.60 a | 51.8 a | 0.0 a | 56.7 bc | 20.42 a | 225.8 a |
| Delaro (R1)
8 oz/a |
14.0 ab | 0.14 ab | 0.96 a | 1.76 abc | 9.50 bcd | 41.4 d | 2.0 ab | 57.1 ab | 19.86 cde | 221.5 a |
| Topguard EQ (R1)
5 oz/a |
12.0 ab | 0.12 ab | 1.02 a | 1.82 abc | 8.40 ab | 46.8 abcd | 10.0 b | 57.0 ab | 20.16 abcd | 233.9 a |
| Lucento (R1)
5 oz/a |
20.0 bc | 0.20 bc | 0.78 a | 1.60 abc | 7.76 a | 49.2 ab | 0.0 a | 56.6 bc | 20.26 abcd | 227.0 a |
| Trivapro (R1)
13.7 oz/a |
26.0 c | 0.28 c | 0.84 a | 1.90 abc | 9.08 bcd | 46.3 abcd | 2.0 ab | 57.0 ab | 20.12 abcd | 226.7 a |
| Miravis Neo (R1)
13.7 oz/a |
12.0 ab | 0.12 ab | 0.70 a | 1.42 ab | 8.58 abc | 48.7 abc | 4.0 ab | 56.8 bc | 20.32 abc | 226.3 a |
| Quilt Xcel (R1)
10.5 oz/a |
20.0 bc | 0.20 bc | 1.08 a | 2.00 abc | 9.74 cd | 46.3 abcd | 8.0 ab | 56.8 bc | 20.22 abcd | 219.7 a |
| Control | 98 d | 1.18 d | 2.7 b | 11.18 d | 9.90 d | 32.5 e | 26.0 c | 57.5 a | 19.38 e | 205.2 a |
| p-value | 0.0001 | 0.0001 | 0.0001 | 0.0001 | 0.004 | 0.0001 | 0.0003 | 0.05 | 0.005 | 0.33 |
| LSD (α=0.05) | 10.45 | 0.12 | 0.50 | 0.84 | 1.29 | 6.8 | 9.77 | 0.65 | 0.50 | 19.0 |
zAll treatments applied 7/14/20 using a Co2 pressurized backpack sprayer equipped with TP8002-VS flat fan nozzles calibrated to deliver 20 GPA at 40 psi with plots set up in RCBD with five replications. All treatments included 0.125% non-ionic surfactant, Induce.
y GLS incidence was rated as percentage of 10 ear leaves with grey leaf spot lesions caused by Cercospora zeae-maydis. Means followed by the same letter are not significantly different based on Fisher’s Least Significant Difference (LSD; α=0.05).
x GLS severity was visually assessed as the avg % ear leaf covered in GLS lesions per plot; means of 10 leaves per plot were used for analysis.
w Curvularia severity was visually assessed as avg % ear leaf covered in Curvularia lesions per plot; means of 10 leaves per plot were used for analysis.
v Yield was calculated from the center two rows of each plot and adjusted to 15.5% moisture.
