1. Age and Size
- Mature enough to respond: Typically ≥5–7 years old
- Sufficient trunk diameter: Minimum 10–15 cm at breast height (DBH)
- Avoid very young or very old trees—they may not respond well or may die
Farmer Tip: Older trees can produce more resin but may be slower to respond.
2. General Health
Look for:
- Healthy green foliage
- No yellowing, wilting, or dieback
- Strong branch structure
- No signs of nutrient deficiency (yellowing leaves, poor growth)
Avoid: Trees with weak growth, poor canopy, or signs of stress
3. Absence of Pests & Diseases
- Check for insect boring, termites, or scale insects
- Ensure no fungal rot or widespread trunk decay
- Trees with active disease may not survive inoculation
Field Check: Tap the trunk—hollow or soft spots indicate internal decay
4. Bark Condition
- Look for intact, healthy bark
- Avoid trees with:
- Excessive cracks
- Dead patches
- Natural wounds or scars that are oozing sap
Why: Healthy bark ensures inoculants can colonize the tree efficiently
5. Environmental Conditions
- Well-drained soil, moderate shade or sunlight
- Not waterlogged or extremely dry
- Trees exposed to extreme stress may respond poorly or die
6. Prior Inoculation History
- If previously inoculated:
- Check for resin quality and quantity
- Avoid trees with failed past inoculations unless carefully monitored
7. Tree Vitality Score (Optional)
Quick farmer scoring method (1–5 scale):
| Score | Criteria |
|---|---|
| 5 | Strong growth, healthy canopy, no pests, >10 cm DBH |
| 4 | Good growth, minor pest signs, good canopy |
| 3 | Average growth, minor stress signs, can inoculate with care |
| 2 | Weak growth, some disease, not recommended |
| 1 | Severely stressed or diseased, do not inoculate |
Tip: Only trees scoring 3 or above should be considered for inoculation.
Farmer Reminder
“Healthy trees respond faster, survive longer, and produce more resin.”