Induction density refers to how many wounds or inoculation sites are applied per tree or per trunk length/area. It’s a key factor influencing resin yield, quality, and tree health.
1. What Is Induction Density?
- Definition: The number of mechanical, microbial, or chemical induction points per tree
- Purpose:
- Maximizes resin coverage
- Balances tree stress vs resin yield
- Avoids excessive vascular blockage or tissue damage
More wounds ≠ always better resin — quality depends on spacing, depth, and tree capacity.
2. Recommended Induction Densities
| Tree Size / Diameter | Wounds per Trunk | Farmer Note |
|---|---|---|
| 8–12 cm | 2–4 | Small, young trees → moderate stress |
| 12–20 cm | 4–8 | Optimal for mature trees; balanced resin and growth |
| >20 cm | 8–12 | Large trees; can tolerate higher density, but watch tree health |
Spacing Guidelines:
- Vertical spacing: 15–25 cm apart
- Horizontal spacing: 10–20 cm apart around trunk circumference
- Avoid overlapping resin zones → prevents fusion and necrosis
3. Effects of Induction Density
| Density | Resin Yield | Tree Health | Risk |
|---|---|---|---|
| Low | Moderate | Good | Minimal stress |
| Moderate | High | Good | Optimal balance |
| High | Very high | Tree may slow growth | Over-stress, vascular blockage, tissue necrosis |
4. Farmer Tips
✔ Adjust number of wounds to tree age, diameter, and vigor
✔ Use hybrid induction methods (mechanical + microbial + chemical) to reduce number of wounds while maximizing resin
✔ Monitor trees for stress symptoms (leaf drop, wilting)
✔ Maintain records: wound location, date, and type of induction
Farmer Key Message
“More wounds do not always mean more resin.
Optimal spacing and density make the tree defend efficiently — higher quality, not just more resin.”