DBH-Based Drilling Patterns for Aquilaria Trees

DBH-Based Drilling Patterns for Aquilaria Trees
DBH-based drilling patterns are critical for standardizing agarwood inoculation, optimizing resin formation, and preventing over-wounding of Aquilaria trees. Below is a field-ready guide structured by DBH (Diameter at Breast Height), aligned with professional agarwood induction systems like your BarIno™ sequential platform.

1. DBH: 5–10 cm (Young Trees – Early Induction)

Objective: Initiate resin response without stressing the tree

• No. of Holes: 4–8 holes
• Pattern: Single spiral (upward)
• Hole Spacing: 5–8 cm vertically
• Depth: 3–5 cm (not exceeding 1/3 trunk diameter)
• Angle: 30–45° downward
• Coverage: One side of trunk only

Notes:

• Use only Phase 1–2 inoculants (e.g., microbial priming like Fusarium oxysporum)
• Avoid full circumference drilling at this stage

---

2. DBH: 10–20 cm (Juvenile Trees – Expansion Phase)

Objective: Expand resin zones and introduce multi-point colonization

• No. of Holes: 10–20 holes
• Pattern: Zigzag or double-helix
• Hole Spacing: 8–10 cm
• Depth: 5–7 cm
• Angle: 45° downward
• Coverage: 2–3 sides of trunk

Notes:

• Suitable for Phase 2–3 (e.g., FusaPrime™, FusaTrinity™)
• Begin vertical stacking layers

3. DBH: 20–40 cm (Mature Trees – Production Phase)

Objective: Maximize resin yield across trunk

• No. of Holes: 20–40 holes
• Pattern: Full spiral or grid pattern
• Hole Spacing: 10–12 cm
• Depth: 7–10 cm
• Angle: 45–60° downward
• Coverage: Full circumference

Notes:

• Apply Phase 3–4 inoculants (FusaTrinity™, FusaBlaze™)
• Ensure even radial distribution

4. DBH: >40 cm (Old Trees – Intensive Resin Induction)

Objective: Full commercial resin saturation

• No. of Holes: 40–80+ holes
• Pattern: Dense grid + multi-layer spiral
• Hole Spacing: 10–15 cm
• Depth: 8–12 cm
• Angle: 45–60°
• Coverage: Entire trunk + primary branches

Notes:

• Deploy full BarIno™ 5-phase system (ending with ResinRush™)
• Allow rest periods between phases (3–6 months)

Technical Best Practices

Drilling Rules

• Always drill at downward angle → prevents water accumulation
• Maintain sterile drill bits (avoid contamination)
• Seal holes if needed (wax or bio-plugs)

Avoid Overstress

• Do not exceed 8–12% trunk volume injury
• Avoid drilling during:
  • Heavy rain season
  • Active flushing stage

Environmental Timing (Philippines Context)

• Best inoculation window: Dry season (Nov–May)
• Ideal temp: 25–32°C

Quick DBH Reference Table

DBH Range	Holes	Pattern	Depth	Coverage	Phase
5–10 cm	4–8	Spiral	3–5 cm	1 side	Phase 1–2
10–20 cm	10–20	Zigzag	5–7 cm	2–3 sides	Phase 2–3
20–40 cm	20–40	Spiral/Grid	7–10 cm	Full	Phase 3–4
>40 cm	40–80+	Dense grid	8–12 cm	Full + branches	Phase 4–5

Pro Insight (For Your BarIno™ System)

You can standardize this into your Schedule A-1 DBH Drilling Map:

• Convert DBH → automated hole count formula
• Map phase-based inoculant layering
• Integrate with AgriTrace™ tracking (hole tagging + resin mapping)

---