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Floral and Nursery Crop Research Initiative Update. ATRU, Application Technology Engineering Group, Wooster, Ohio. Dr. Richard C. Derksen. Research Objectives/Goals:. Identify common methods growers use for treating nursery and greenhouse crops - PowerPoint PPT Presentation
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ATRU, Application Technology Engineering Group, Wooster, Ohio
Dr. Richard C. Derksen
Floral and Nursery Crop Research Initiative Update
Research Objectives/Goals:
• Identify common methods growers use for treating nursery and greenhouse crops
• Establish cooperative research programs with producers
• Assess and develop methods for improving efficacy in nurseries and greenhouses
• Identify means for reducing drift risk in nursery production areas
Research Objective:
To evaluate sprayer operating parameters that may improve the effectiveness of sprays made to nursery crops
•Parameters evaluated:–Form of spray delivery–Air outlet speed–Fan orientation–Application rate–Ground speed
Experimental Nursery Sampling Sites
TargetHeight
1 m
2 m
3 m
Row 1Row 2Row 3
Q2
Q2
Q2
Q1
Q1
Q1
Q1
Q3
Q3
Q2Q1
Q1Q3
Q3
On-farm nursery sprayer trials:• The conventional, axial fan, sprayer can not
treat multiple rows effectively
• A second-pass is a very effective method for producing relatively uniform spray deposits
• CF reduced volume sprays can increase field capacity and provide similar within block treatment
• Reducing CF fan speed can improve near-sprayer performance
Apple Scab Management Sprayer Trial• Three sprayer treatments:
– High volume (57 gpa), Conventional sprayer– Low volume (20 gpa), Conventional sprayer, low drift nozzles– Low volume (20 gpa), Crossflow sprayer
• Big drop off in coverage beyond 2nd row• Significantly less coverage on backside of tree canopies• Some droplet deposits did not contain active ingredients
Drift Measurement Test Site Layout
128 METERS POSITION 7
256 METERS POSITION 8
LEAF TARGET X
NOTE 1: THE DISTANCE BETWEEN POSITIONS ARE MEASUREDAT AN ANGLE FROM THE TREE LINE.
64 METERS POSITION 6
PASS NO.
8 METERS POSITION 3
4 METERS POSITION 2
LEGEND
DOUBLE STAPLEX SAMPLER
SINGLE STAPLEX SAMPLER
GROUND TARGET
APPLE TREE
BIVANE
TOWER
Control
Tree 61Small Tree
Tree 86
32 METERS POSITION 5
16 METERS POSITION 4
86X
X
Line 1X
X
Line 2
61
Tree 90
Line 3X
X
90
Electrostatic Systems Sprayer, EPS-5
DRAMM Mini-Coldfogger
High volume sprayer,many nozzles to choose from
Greenhouse Application Equipment Trials:
Spray quality assessments: Bench plants, Top of canopy, Upperside surface
Autofogger ESS (electrostatic)
Coldfogger (one side only) Coldfogger (two sides)
Greenhouse trial findings:
• High volume application equipment is able to deposit more material onto target foliage than the ESS or DRAMM
• The increased quantity from high volume sprays does not result in increased efficacy
• DRAMM and ESS are more effective equipment, but are being used with a less effective application volume
• High volume, hydraulic sprayer is less effective but its problems are being overcome by a more effective application volume
• Demonstrate to growers how use equipment most efficiently in their operations
• Demonstrate new equipment options to producers
• Report findings through research journals, popular press, and producer meetings and workshops
Technology transfer objectives/goals:
On-Farm Nursery Sprayer Surveys
On-Farm Nursery Sprayer Calibrations
Results:
• Few equipment operators knowledgeable about equipment operation
• Non-functioning pressure gauges found
• Wide-range of travel speeds used
• Several different kinds of nozzles used
On Farm Coverage/Penetration Evaluations
On-Farm Coverage/Penetration Evaluations
Greenhouse workshops: Lectures and hands-on experiences
Future plans:
• Greenhouse fungicide trials comparing delivery techniques and surfactants
• Identify means to reduce damage to beneficial nematodes delivered through sprayers
• Nursery field trials comparing efficacy for low-drift and high-drift risk sprayer set-ups
• Evaluate effect of canopy development on spray movement
• Work with producers to optimize sprayer operation and minimize off-site impact