> ## Documentation Index
> Fetch the complete documentation index at: https://badixth-dc85e378.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Oil Palm Diagnosis: Decide What a Field Change Means and What to Do

> The starting point for interpreting oil palm field changes across a 25-year stand. Covers all three pillars: abiotic stress, nutrient disorders, and biotic stress, plus a scout-first decision tree keyed to what you see on individual palms.

Oil palm is a 25-year crop with individual palms yielding bunches every 10 to 14 days. Diagnosis works at three scales at once: whole block, palm cluster, and individual palm. Use this guide to move from a field observation or a satellite alert to a specific cause and a specific action.

For the standard census and inspection sequence a scout should follow on the ground, see [Field Walk Protocol](/guides/Crop/Oil-Palm/field-walk-protocol).

## The three pillars

<CardGroup cols={3}>
  <Card title="Abiotic Stress" icon="sun" href="/guides/Crop/Oil-Palm/abiotic/drought">
    Water deficit, waterlogging, peat subsidence, acid sulfate, salinity, wind, lightning, fire. Slow, block-scale, weather-driven.
  </Card>

  <Card title="Nutrient Disorders" icon="flask" href="/guides/Crop/Oil-Palm/nutrient/potassium">
    N, P, K, Mg, Ca, B, Cu, Fe, Zn, and toxicities. Frond-color signatures are unusually specific in oil palm.
  </Card>

  <Card title="Biotic Stress" icon="bug" href="/guides/Crop/Oil-Palm/biotic/diseases/ganoderma">
    Diseases, insect pests, and weeds. Individual-palm and cluster-scale. Ground confirmation essential.
  </Card>
</CardGroup>

## Scout-first decision tree

Use what you see first to pick the pillar. The scout looks at four things on each palm, in this order.

### 1. Block-level pattern

| What you see across the block                            | Likely pillar                                                 |
| -------------------------------------------------------- | ------------------------------------------------------------- |
| Whole block uniformly off, matches weather or soil map   | **Abiotic** or block-wide nutrient                            |
| Gradient across the block following topography           | **Abiotic** (drainage) or soil-linked nutrient                |
| Scattered individual palms declining, no clear pattern   | **Biotic** - trunk disease (Ganoderma)                        |
| Spreading focus of dying palms, expanding month to month | **Biotic** - contagious disease (Bud Rot, Fusarium, Red Ring) |
| Fronds chewed, defoliated, or skeletonized               | **Biotic** - insects (bagworms, nettle caterpillars)          |
| Spears broken, bored, or rotten                          | **Biotic** - Rhino beetle, palm weevil, or Bud Rot            |

### 2. Frond color and position (nutrient decision tree)

Frond color patterns in oil palm are so specific they are often named after the deficiency. Match what you see to the table.

| What you see                             | Where on the palm    | Likely cause                                                                  |
| ---------------------------------------- | -------------------- | ----------------------------------------------------------------------------- |
| Overall pale green, whole canopy         | All fronds           | [Nitrogen](/guides/Crop/Oil-Palm/nutrient/nitrogen)                           |
| Confluent orange spots, older fronds     | Mid to lower canopy  | [Potassium](/guides/Crop/Oil-Palm/nutrient/potassium) (mineral soils)         |
| Bright orange whole fronds, older first  | Mid to lower canopy  | [Magnesium](/guides/Crop/Oil-Palm/nutrient/magnesium) (light and sandy soils) |
| Hooked, fish-tail, or little-leaf fronds | Young spear fronds   | [Boron](/guides/Crop/Oil-Palm/nutrient/boron)                                 |
| Mid-crown yellow-green fronds            | Mid canopy           | [Copper](/guides/Crop/Oil-Palm/nutrient/copper) (peat and sandy soils)        |
| Chlorotic youngest fronds                | Spear and just below | [Iron](/guides/Crop/Oil-Palm/nutrient/iron) (high-pH soils)                   |
| Older fronds bronze or purple            | Lower canopy         | [Phosphorus](/guides/Crop/Oil-Palm/nutrient/phosphorus)                       |

### 3. Trunk (disease decision tree)

| What you see                                       | Likely cause                                                                  |
| -------------------------------------------------- | ----------------------------------------------------------------------------- |
| Bracket fungus at base + one-sided frond collapse  | [Ganoderma / Basal Stem Rot](/guides/Crop/Oil-Palm/biotic/diseases/ganoderma) |
| Bracket fungus mid-trunk                           | [Upper Stem Rot](/guides/Crop/Oil-Palm/biotic/diseases/upper-stem-rot)        |
| Wilting spreads outward from one palm, no brackets | Fusarium Wilt or Bud Rot                                                      |
| Spear rot with necrotic center                     | Bud Rot                                                                       |
| Ring of red-brown tissue when trunk is sliced      | Red Ring                                                                      |
| Bore holes with frass at trunk                     | Palm Weevil                                                                   |

### 4. Spear and youngest fronds (growing-point decision tree)

| What you see                          | Likely cause                        |
| ------------------------------------- | ----------------------------------- |
| Spear pulls out easily, rotten inside | Bud rot, or late-stage rhino beetle |
| V-shaped notches in unopened frond    | Rhino beetle feeding                |
| Hooked, deformed young frond          | Boron deficiency                    |
| Chlorotic young frond                 | Iron deficiency or Crown Disease    |

## Stand-age vulnerability

Different stresses matter at different ages. Use this alongside the pattern tables.

<Warning>
  **These are not the stand-age classes a band resolves against.** This table groups ages by *what goes wrong*; [Oil Palm Ecosystems](/guides/Crop/Oil-Palm/oil-palm-ecosystems) groups them by *what the canopy is doing*, and the boundaries do not line up. A 7-year-old block is **yield build-up** here and **prime mature** there; a 16-year-old block is **peak yield** here and **late mature** there.

  **The ecosystems page is the authority for anything that resolves a band.** Use the mapping below to cross from one to the other, and never quote a class from this table as if it keyed a band.

  | This page                     | Resolves to, on the ecosystems page                                                               |
  | ----------------------------- | ------------------------------------------------------------------------------------------------- |
  | Nursery (\< 12 months)        | 0 – 1 year, newly planted                                                                         |
  | Immature (1 to 3 years)       | 1 – 3 years, immature                                                                             |
  | Yield build-up (3 to 8 years) | **spans two** — 3 – 6 young mature, and the first two years of 6 – 15 prime mature                |
  | Peak yield (8 to 18 years)    | **spans two** — the rest of 6 – 15 prime mature, and the first three years of 15 – 25 late mature |
  | Decline (18+ years)           | **spans two** — the rest of 15 – 25 late mature, and > 25 senescent                               |

  Three of the five classes straddle a band boundary. **A block in one of those three has no single band**, and the platform resolves it from stand age directly rather than from this table.
</Warning>

| Stand age                     | What matters most                                                               |
| ----------------------------- | ------------------------------------------------------------------------------- |
| Nursery (\< 12 months)        | Cercospora, anthracnose, nursery blast, boron, iron, rats                       |
| Immature (1 to 3 years)       | Rhino beetle, rats, Imperata, boron, drought, waterlogging                      |
| Yield build-up (3 to 8 years) | Potassium, magnesium, drought, Ganoderma (early), bagworms, nettle caterpillars |
| Peak yield (8 to 18 years)    | Potassium, magnesium, Ganoderma, drought lag effects, bunch pests               |
| Decline (18+ years)           | Ganoderma cluster expansion, replanting decisions                               |

## How satellites contribute

Oil palm imagery works at three scales at once. Match the tool to the question.

| Scale           | Best for                                             | Typical alert                                                |
| --------------- | ---------------------------------------------------- | ------------------------------------------------------------ |
| Block / canopy  | Slow abiotic and nutrient decline, block-wide stress | NDVI or EVI monthly trend below stand-age baseline           |
| Palm cluster    | Spreading disease foci (Ganoderma, Bud Rot)          | Localized zonal NDVI drop expanding month to month           |
| Individual palm | Single declining or dead palms                       | Very-high-resolution or drone imagery; crown count anomalies |

<Warning>
  Oil palm change is slow. A weekly NDVI review is over-monitoring for most abiotic and nutrient issues. Monthly is usually enough, except during outbreak or replanting phases.
</Warning>

## Decision flow

<Steps>
  <Step title="Read the block-level pattern">
    Uniform, gradient, scattered, or spreading? Use the block-level table to pick the pillar before you walk in.
  </Step>

  <Step title="Walk to suspect palms and inspect">
    Follow the [Field Walk Protocol](/guides/Crop/Oil-Palm/field-walk-protocol). Check crown, frond color and position, trunk, and spear in that order.
  </Step>

  <Step title="Match symptoms to a specific cause">
    Use the frond, trunk, and spear tables above to move from symptom to page.
  </Step>

  <Step title="Act, record, and set a monitoring alert">
    Apply the recommended action, record the palm or block, and use the [Alerts](/guides/alerts-notifications) page to configure a follow-up so the same issue is flagged earlier next time.
  </Step>
</Steps>

## Related

* [Healthy NDVI ranges for oil palm across planting environments](/guides/Crop/Oil-Palm/oil-palm-ecosystems) - stand-age baselines to compare against.
* [Field Walk Protocol](/guides/Crop/Oil-Palm/field-walk-protocol) - the standard scout inspection sequence.
* [Set up automated crop alerts](/guides/alerts-notifications) - configure the triggers that surface these stresses.
* [Analyze crop performance across a full season](/guides/seasonal-analysis) - the right tool for slow oil palm decline.

<Note>
  This diagnosis covers the three major stress groups plus a scout-first decision tree. Rare stresses (nutrient interactions, replanting-transition problems, physiological disorders) can be added as short reference pages later.
</Note>