Enhancing Low Volume Fungicide Applications on Corn with Additives

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Improving Canopy Coverage by using Deposition
Aids in Low Volume Aerial Fungicide Applications
in Corn
NAAA Convention Dec. 8, 2008 Las Vegas, NV
Robert E. Wolf Associate Professor - Extension
Specialist Application Technology
Scott Bretthauer Extension Specialist Pesticide
Safety Education Agricultural and Biological
Engineering
Biological and Agricultural Engineering
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Concerns

• Deposition aids Is there a benefit?
• Low volume aerial applications
• Trend in aerial applications
• Is that enough volume of carrier
• Where should we place the active ingredient?
• Top, middle (ear area), bottom
• Canopy penetration, deposition, and coverage
• Is droplet spectra a concern?
• Do the adjuvants change the droplet size?

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Objectives

• Evaluate and compare adjuvant treatments when
  used with low volume aerial applications of
  fungicide on corn to
• Compare droplet coverage throughout the crop
  canopy
• Compare yield
• Compare disease control

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Air Tractor 502
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Purge and clean/rinse area
spray west to east
1000 ft
1000 ft
1200 ft
No plots
300 rows
Rep 1
Rep 2
Rep 3
Air strip-1/2 mile
11 - 65 ft swaths 26 rows 286 rows
Plot access strips
GPS Coordinates about 40,34,46.99N and
90,33,38.23W
Droplet test area near the red dashed line in
each rep.
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3
2
1
Open canopy test
1
3
2
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Treatments

• Headline (6 oz) _at_ 2.0 GPA

• Adjuvants

• Premium COC _at_ 16 oz
• Between _at_ 8 oz
• Downdraft _at_ 4 oz
• USEX0108 _at_ 4 oz
• USEX0108 _at_ 8 oz
• 6. USEX0208 _at_ 4 oz
• USEX0208 _at_ 8 oz
• USEX0308 _at_ 4 oz
• USEX0308 _at_ 8 oz
• SRN-28 Between _at_ 8 oz
• Untreated check

GarrCo Vision Pink dye at 0.5 v/v United
Suppliers, Inc.
11
10 ft. mower swath
10 ft. mower swath
975 ft
1025 ft
925 ft
T3
T8
T9
T5
T7
T11
T1
T2
T10
No plots
T3
T5
T7
T6
T9
T11
waterway
waterway
T2
T8
T8
300 rows of test hybrid
East side - Road
T5
T7
T10
T2
T4
T4
T1
T6
T9
T4
T6
T11
T1
T3
T10
Rep 1
Rep 2
Rep 3
666 ft
1 mower swath 2 rows
swath line each plot (SW 65 feet)
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1
3
2
NC
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Plot 65 ft.
Row 1
Row 10
Center row
Card Plant heights
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DropletScan? used to analyze droplets
Kromekote Paper
Water Sensitive Paper
Software lock-key
Color Scanner
Computer
System Components
Color Printer
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Analysis Procedure

• Scanned and recorded
• 990 canopy papers
• Area Coverage
• droplet size characteristics
• Spread factor determined by Protocol established
  at USDA ARS in College Station.
• Statistical analysis with SAS
• Proc Mixed
• T grouping for LS Means
• Alpha .05

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Results and Discussion
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Coverage
.05
All treatments Headline _at_ 6 ounces/acre

1. Premium COC _at_ 16 oz
2. Between _at_ 8 oz
3. Downdraft _at_ 4 oz
4. USEX0108 _at_ 4 oz
5. USEX0108 _at_ 8 oz

• 6. USEX0208 _at_ 4 oz
• USEX0208 _at_ 8 oz
• USEX0308 _at_ 4 oz
• USEX0308 _at_ 8 oz
• SRN-28 Between _at_ 8 oz

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Coverage
.05
All treatments Headline _at_ 6 ounces/acre

1. Premium COC _at_ 16 oz
2. Between _at_ 8 oz
3. Downdraft _at_ 4 oz
4. USEX0108 _at_ 4 oz
5. USEX0108 _at_ 8 oz

• 6. USEX0208 _at_ 4 oz
• USEX0208 _at_ 8 oz
• USEX0308 _at_ 4 oz
• USEX0308 _at_ 8 oz
• SRN-28 Between _at_ 8 oz

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Coverage
.05
All treatments Headline _at_ 6 ounces/acre

1. Premium COC _at_ 16 oz
2. Between _at_ 8 oz
3. Downdraft _at_ 4 oz
4. USEX0108 _at_ 4 oz
5. USEX0108 _at_ 8 oz

• 6. USEX0208 _at_ 4 oz
• USEX0208 _at_ 8 oz
• USEX0308 _at_ 4 oz
• USEX0308 _at_ 8 oz
• SRN-28 Between _at_ 8 oz

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Coverage
.05
All treatments Headline _at_ 6 ounces/acre

1. Premium COC _at_ 16 oz
2. Between _at_ 8 oz
3. Downdraft _at_ 4 oz
4. USEX0108 _at_ 4 oz
5. USEX0108 _at_ 8 oz

• 6. USEX0208 _at_ 4 oz
• USEX0208 _at_ 8 oz
• USEX0308 _at_ 4 oz
• USEX0308 _at_ 8 oz
• SRN-28 Between _at_ 8 oz

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Yield
18.6 Bu/acre difference
.05
Variety Midwest Seed Genetics 76865 VT3
All treatments Headline _at_ 6 ounces/acre

• 6. USEX0208 _at_ 4 oz
• USEX0208 _at_ 8 oz
• USEX0308 _at_ 4 oz
• USEX0308 _at_ 8 oz
• SRN-28 Between _at_ 8 oz
• Untreated check

1. Premium COC _at_ 16 oz
2. Between _at_ 8 oz
3. Downdraft _at_ 4 oz
4. USEX0108 _at_ 4 oz
5. USEX0108 _at_ 8 oz

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Disease
No Significant Difference Found
.05
Ratings provided by Carl Bradley U of IL
All treatments Headline _at_ 6 ounces/acre

• 6. USEX0208 _at_ 4 oz
• USEX0208 _at_ 8 oz
• USEX0308 _at_ 4 oz
• USEX0308 _at_ 8 oz
• SRN-28 Between _at_ 8 oz
• Untreated check

1. Premium COC _at_ 16 oz
2. Between _at_ 8 oz
3. Downdraft _at_ 4 oz
4. USEX0108 _at_ 4 oz
5. USEX0108 _at_ 8 oz

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Summary
Bottom

• Significant differences in coverage were measured
  in all three collector positions.
• Treatments 6, 2, 4, and 1 provided the highest
  coverage in the bottom of the canopy.
• USEX0208 _at_ 4 oz
• Between _at_ 8 oz
• USEX0108 _at_ 4 oz
• Premium COC _at_ 16 oz
• Treatments 10 and 3 had the lowest bottom
  coverage.
• SRN-28 Between _at_ 8 oz
• Downdraft _at_ 4 oz

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Summary
Middle

• Treatments 4, 6, and 3 provided the greatest
  coverage in the middle canopy (ear leaf).
• USEX0108 _at_ 4 oz
• USEX0208 _at_ 4 oz
• Downdraft _at_ 4 oz
• Treatment 9 had the lowest coverage in the middle
  canopy.
• USEX0308 _at_ 8 oz

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Summary
Upper

• Treatments 7, 4, 5, and 10 provided the greatest
  coverage in the upper canopy.
• USEX0208 _at_ 8 oz
• USEX0108 _at_ 4 oz
• USEX0108 _at_ 8 oz
• SRN-28 Between _at_ 8 oz
• Treatment 1 had the lowest coverage in the upper
  canopy.
• Premium COC _at_ 16 oz
• Treatments 4, 6, and 2 tended to provide the best
  TOTAL coverage throughout the canopy.

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Summary
Yield

• No significant yield differences between adjuvant
  treatments.
• There was a significant difference in yield when
  comparing to the untreated check (18.6 bu/a).
• Disease pressure was present.
• Common rust, anthracnose, gray leaf spot
• No significant difference among treatments or the
  untreated check.

Disease
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Acknowledgements
Applicator - Landowner - Producer -
Manufacturers -Technicians - Others