Divisi
Coconut mite
Aceria guerreronis · Mite
Photo: Hartford Hammond Keifer · Public domain
Coconut mite (Aceria guerreronis) is a mite so tiny you will never see it with your eyes. It lives in hidden colonies packed under the perianth — the 'cap' of hard, overlapping scales where a young coconut joins its stalk — feeding on the soft growing skin of the nut. As the nut swells, that feeding leaves pale triangular scars that harden into brown, corky, cracked patches, so nuts finish small, lopsided and light on flesh, and many drop before they mature. The mites drift on the wind and crawl onto fresh flowers and young nuts, so an attack creeps across a stand of palms bunch after bunch. It attacks only coconut.
Why it matters
Coconut mite can quietly steal up to a third (30%) of your nut harvest. The nuts it attacks come out small, cracked and light, so you get less copra (the dried coconut flesh you sell for oil) and less coconut water, and many young nuts simply drop before they ripen. It is so hard to beat once it settles in because the mites live hidden under the cap at the base of the nut, where sprays and even your own fingers cannot easily reach them, and because they blow from palm to palm on the wind, one infested palm slowly seeds your whole stand. Your two real weapons are catching it early and keeping your palms strong enough to shrug it off.
When to act
Pale triangular scarring visible on nuts under the perianth, or nut drop rising above normal.
This guidance is general, compiled from published agronomic references including FAO and CABI. Thresholds and timing shift with your crop, your variety and the season.
In much of the region a spray is simply called mushonga — medicine. But a chemical group you cannot name is one you cannot rotate, and a product you did not write down has no pre-harvest interval you can observe. Mushonga, and other farming words →
The full coconut mite field guide
- Identify it
- Scout for it
- Control it
12 field-guide sections in the app
The full guide to coconut mite — every symptom to check, how and when to walk your field looking for it, and the controls that actually work, ranked. Built into your crop plan, so you are told to look before it costs you a harvest.
Crops it affects
Frequently asked questions
How do I identify coconut mite?
The damage shows first — and it is the only thing you will actually see. On a young green nut, look right where it joins the stalk, just under the perianth (the 'cap' of hard, overlapping scales). A fresh attack shows as pale, whitish triangular patches creeping out from under the cap, like a pale triangle pointing down the nut. As the nut grows, those scars turn brown, corky and cracked, sometimes weeping a little gum, and the whole nut ends up small, lopsided and rough.
When should I take action against coconut mite?
Pale triangular scarring visible on nuts under the perianth, or nut drop rising above normal.
How do I control coconut mite?
Prevent first — keep every palm strong. A well-fed, well-watered palm shrugs the mite off far better than a stressed one, and the mite does its worst when dry-weather stress has already weakened the palm's own defences. Give balanced fertiliser and, wherever you can, water during dry spells so the palms stay vigorous. Strong palms are your single most reliable lever against this pest.
Which crops does coconut mite affect?
Among the crops covered here: Coconut.
Catch it before it costs you a harvest
Divisi builds scouting into your crop plan — it tells you when to walk your field, what to look for at that stage, and what to do when you find it. Free for farmers, works offline.
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