> ## 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.

# Diagnose and Respond to Red Ring Disease in Oil Palm

> Identify Red Ring disease from progressive frond death, characteristic red-brown ring in the trunk cross-section, and its palm weevil vector, and manage it with weevil trapping, sanitation, and clean planting material.

Red Ring disease is caused by the nematode *Bursaphelenchus cocophilus* and is transmitted primarily by the American palm weevil (*Rhynchophorus palmarum*). The disease name comes from the characteristic red-brown ring visible when the trunk of an infected palm is cut in cross-section. It kills palms within months once symptoms appear and is a serious problem across the American tropics.

**Regional priority:** High in Latin America (Colombia, Ecuador, Brazil, Venezuela, Central America). Not present in Southeast Asia or Africa.

## When oil palm is most vulnerable

Any age from immature onward. Palms in the 3 to 15 year range are most commonly affected. Recent planting near infected coconut, ornamental palm, or oil palm sites is a strong risk factor.

## How Red Ring shows in satellite data

* **Individual-palm decline** in high-resolution imagery, progressing from crown yellowing to full collapse over 2 to 4 months.
* **Scattered pattern** across the plantation rather than clustered - vector-driven distribution follows weevil movement.
* Not distinguishable from other systemic diseases (Bud Rot, Fusarium Wilt) in imagery. Ground diagnosis is required.
* **Weevil trap catch data** paired with imagery gives a much stronger picture than either alone.

<Warning>
  Red Ring is confirmed only by cutting the trunk. Do not misdiagnose from crown symptoms alone - Bud Rot, Fusarium Wilt, and Red Ring all present with crown decline.
</Warning>

## Field symptoms

* **Progressive frond yellowing** starting with the mid-canopy fronds and progressing up and down.
* **Shortened and stunted new fronds** emerging from the crown.
* **Reduced bunch production** in the months leading to full decline.
* **Death within 2 to 4 months** of first visible symptoms.
* **Red-brown ring** 3 to 5 cm inside the trunk, visible in cross-section - the diagnostic sign.
* **Palm weevil bore holes** and frass near the trunk base.

## Reduce the damage by

* **Trap and remove palm weevils** - pheromone-baited traps combined with plant volatiles significantly reduce vector populations. Trap density and maintenance are the key controls.
* **Sanitation felling** - fell and destroy infected palms as soon as diagnosis is confirmed. Do not leave infected trunk material on site - it becomes a weevil breeding site.
* **Destroy weevil breeding sites** - remove decaying palm material, fallen trunks, and pruning debris from the block.
* **Do not prune excessively** or leave large wounds - weevils are attracted to fresh wounds and volatiles.
* **Coordinated regional weevil management** - one estate cannot control weevil populations alone if neighbors leave breeding sites intact.
* **Screen planting material** for weevil damage and possible nematode carriage.
* **No effective chemical treatment** for infected palms - focus resources on vector control.

## Set an alert for early warning

<Tip>
  Turn the diagnosis into a trigger. Red Ring alerts should combine weevil trap data with imagery review, not imagery alone.
</Tip>

Recommended settings for Red Ring on oil palm:

* **Weekly weevil trap review** in endemic zones.
* **Palm-cluster NDVI drop alert** - trigger on scattered individual palm decline (not clustered - use pattern to distinguish from Ganoderma).
* **Sanitation compliance reminder** - schedule regular verification that felled palms have been destroyed and breeding sites cleared.

## Related

* [Oil Palm Diagnosis](/guides/Crop/Oil-Palm/oil-palm-diagnosis)
* [Palm Weevil](/guides/Crop/Oil-Palm/biotic/insects/palm-weevil) - the vector; must be managed together.
* [Bud Rot](/guides/Crop/Oil-Palm/biotic/diseases/bud-rot) - overlapping regional presence and crown symptoms.
* [Set up automated crop alerts](/guides/alerts-notifications)