Coconut eriophyid mite
A microscopic mite under the young nut’s bracts — triangular scars, corky cracked distorted nuts, heavy button shedding and smaller copra.
- Pest type
- Microscopic mite
- Attacks
- Young nut surface (under bracts)
- Worst in
- Developing nuts; stressed palms
- Main risk
- Scarred nuts; button shedding; small copra
Overview
The coconut eriophyid mite is a microscopic mite that has become a widespread pest of coconut. The mites live packed in colonies in the narrow, sheltered space under the tender bracts (perianth) at the base of young, developing nuts, where they rasp and feed on the soft nut surface, protected from sprays and weather.
Their feeding first shows as a pale triangular patch under the perianth; as the nut grows this becomes brown, corky, warty and cracked scarring, and the nut may be distorted and undersized. Heavy infestation causes immature nuts ("buttons") to drop and reduces the size of the nut and the copra inside. Because the mite shelters under the bracts where sprays struggle to reach, management leans on tree nutrition and vigour, biological agents and root/crown treatments rather than simple cover spraying.
How to identify it
- A pale triangular patch under the perianth (bracts) at the base of young nuts, where the mites feed.
- As nuts grow, brown, corky, warty, cracked scarring spreading from under the bracts, with distorted, undersized nuts.
- Heavy shedding of immature nuts ("buttons").
- The mites themselves are microscopic and not visible to the naked eye — the scarring pattern is the diagnostic.
The damage it does
- Corky, cracked, scarred and distorted nuts with a downgraded appearance and lower market value.
- Reduced nut size and less copra inside — a direct yield and quality loss.
- Heavy button (immature nut) shedding in a severe infestation.
- Damage that is hard to reverse on a nut once scarring is set, so prevention on developing nuts matters.
When to act
- Protect the developing nuts, since the mite attacks the young nut under the bracts; act before scarring is widespread.
- Keep palms well-nourished and unstressed, as healthy palms tolerate and suffer less from the mite.
- Because the mite is sheltered under the bracts, prioritise approaches that reach it (root feeding, crown treatment, biologicals) over surface sprays.
Organic & cultural control
- Keep palms vigorous with balanced nutrition and irrigation — well-managed, unstressed palms are markedly less affected, and good potassium/micronutrient nutrition is emphasised.
- Apply neem-based products and encourage/introduce predatory mites and entomopathogenic fungi (e.g. Hirsutella) where available, as recommended.
- Remove and destroy heavily affected fallen buttons and maintain garden hygiene.
- Follow the recommended integrated package for the mite rather than relying on a single measure.
Chemical control
- Because the mite shelters under the bracts, recommended delivery methods (such as root feeding or crown application of an approved acaricide/product, per the official protocol) reach it better than a surface spray.
- Any treatment on a food-bearing palm must follow the official recommendation and safety intervals precisely.
- Integrate chemical/biological treatment with good nutrition and hygiene rather than relying on it alone.
- Confirm the current recommendation and method for your area with your local KVK or the coconut development board.
Crops most at risk
Where this problem is called out in our crop guides — open a crop for the full package of practices.
Frequently asked questions
My coconuts have brown corky cracked scars and are distorted. What is it?
That corky, cracked, warty scarring — often starting as a triangular patch under the bracts at the base of young nuts — with distorted, undersized nuts is the coconut eriophyid mite. The mites are microscopic and live packed under the perianth, rasping the young nut surface. Keep palms vigorous and follow the recommended integrated management, since sprays struggle to reach under the bracts.
Why are the mites so hard to control with sprays?
Because they live in colonies packed into the narrow space under the tender bracts (perianth) at the base of the nut, sheltered from surface sprays and weather. That is why management leans on keeping palms well-nourished and vigorous, on biological agents, and on recommended delivery methods (like root feeding or crown treatment) that can reach the sheltered mite, rather than simple cover spraying.
Does tree health really affect eriophyid mite damage?
Yes — well-managed, well-nourished, unstressed palms are markedly less affected and recover better, and good nutrition (with emphasis on potassium and micronutrients) and adequate irrigation are a core part of the recommended management. So maintaining palm vigour is not just general good practice here; it is a genuine control measure against the mite.
Symptoms and control measures follow ICAR, KVK and state agricultural-university package-of-practices; any named chemical is a registered use. Always read the product label and confirm the dose for your crop and zone. editorial policy.