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Planting, Seeding & Spraying Equipment

Orchard Sprayers

Tree fruit needs spray that reaches through leaves, fruit and branches, often at heights a field boom cannot match. Orchard sprayers are built for that vertical target.

Key points

  • Orchards need spray delivered up, sideways and through the canopy.
  • Air-blast, tower and handgun units each suit different tree sizes and acreage.
  • Calibrate for tree row volume and check coverage with water-sensitive paper.
  • Close nozzles that spray over the canopy, and watch wind and buffers to cut drift.
  • Use ROPS with a seat belt, keep shields on and follow all label intervals.

What makes orchard spraying different from field spraying?

A field crop is a flat target. An orchard is a tall, three-dimensional one, with dense leaves, fruit clusters and wood that all need to be covered. Droplets must travel sideways and upward and then into the canopy, and the canopy changes size through the season.

The pesticide label is the law, and it lists approved crops, timings and application limits. Your extension fruit specialist knows which pests and diseases matter in your region and when to scout.

What types of orchard sprayers are there?

Air-blast sprayers use a fan to push droplets into the tree. They are common in larger plantings. Tower and multi-head sprayers direct air from vertical outlets. Handgun sprayers on a hose reel or tank fit a few trees or backyard plantings. Some growers use tunnels or shielded designs aimed at reducing drift, so ask a dealer and your extension office what suits your plantings.

Which one fits depends on tree size, row spacing, terrain, tank volume and how often you spray.

How do tree size and row spacing guide your choice?

A 5-acre planting of dwarf trees on a trellis has a narrow canopy wall, while old standard trees have wide, tall crowns. The sprayer must be sized to the target. Too little airflow leaves the tops dry, too much blows spray past the tree and into the next row or off the property.

Row width matters for tractor clearance and turning. Measure your narrowest row and your steepest slope before you shop, and tell the dealer.

How do you calibrate an orchard sprayer?

Calibration here means matching output, travel speed, nozzle selection and air direction to the tree row, not just measuring gallons per acre. Extension fruit programs publish methods to figure tree row volume and to set nozzles so more spray goes where the canopy is.

Use water-sensitive paper clipped at different heights and depths in the tree to check coverage. Adjust nozzle position and closing off nozzles that spray over the top or into the gap between trees. Recalibrate as the canopy fills out.

How do you reduce drift in an orchard?

Turn off nozzles that point above the canopy, especially on the outside rows, and slow your travel speed enough that the air actually reaches the middle of the tree. Avoid spraying in strong wind or during inversions. Check label buffer requirements near water, homes and neighboring crops.

Early in the season, when leaves are small, less airflow and lower volume may be appropriate. Matching air and volume to canopy size, as extension guidance describes, helps both coverage and drift.

What safety points apply to orchard spraying?

A tractor pulling an air-blast sprayer should have ROPS with a fastened seat belt, and the PTO shaft shielding must stay in place. Slopes and soft ground in an orchard increase rollover risk, so know your limits and follow the tractor manual.

Wear the protective equipment the label requires. Keep pickers, children and visitors out of treated rows according to the restricted entry interval. Store and mix chemicals as the label directs, and keep records of every application.

What maintenance keeps an orchard sprayer reliable?

Clean the tank, lines and filters after each use. Inspect hoses, fittings, nozzles, fan blades and the PTO driveline. Check pump oil and gearbox oil with the manufacturer's recommended fluids and intervals in the manual. Winterize pumps and lines before freezing weather. For gearbox, pump or driveline problems, call the dealer service department or a qualified mechanic.

When to get help: Your state extension fruit specialist can help you set up and calibrate for your tree type and spacing. Call a dealer service department or qualified mechanic for PTO, gearbox or pump problems.

Sources and further reading

Organization homepages are linked so you can search them for current guidance on this topic.

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