Divisi
Coffee leaf miner
Leucoptera coffeella · Insect
The coffee leaf miner is a tiny silvery-white moth (Leucoptera coffeella) whose grub spends its whole young life hidden inside the leaf of your coffee bush. The moth glues its eggs onto the top of a leaf; the grub that hatches bores straight into the leaf skin and tunnels between the upper and lower surfaces, eating the green flesh, so you never see the grub itself — only the dead brown blister it leaves behind. It then spins a small white cocoon under the leaf and turns into the next moth, and in hot, dry weather it races through several fast generations, browning and dropping the tree's leaves.
Why it matters
When the miner takes hold, its grubs kill the very leaves your coffee needs to feed itself and fill its cherries, and a heavy attack can cost you up to a third (30%) of your harvest while also weakening next year's bearing wood. It is hard to stop once it is established because the grub feeds sealed inside the leaf, where sprays cannot reach it, and it breeds fast through several generations in a single hot, dry season. Worse, blasting the bushes with strong poison kills the tiny wasps that normally keep it down, so the miner comes back stronger than before. Your best defence is to keep the trees healthy, keep their tiny helpers alive, and catch a build-up early.
When to act
Around 20-30 percent of upper-canopy leaves carrying active mines.
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 coffee leaf miner field guide
- Identify it
- Scout for it
- Control it
13 field-guide sections in the app
The full guide to coffee leaf miner — 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 coffee leaf miner?
The damage you see first: irregular brown, papery blister-patches on the _top_ of the leaf, as if a small area was scalded and dried out. Hold the leaf up to the sun and a real mine is hollow and see-through — a little tunnel between the two skins of the leaf — and inside you may spot the tiny grub or its dark specks of droppings (frass). Badly mined leaves brown right over, curl, and drop off, thinning the tree.
When should I take action against coffee leaf miner?
Around 20-30 percent of upper-canopy leaves carrying active mines.
How do I control coffee leaf miner?
PREVENT — shade and vigour (your everyday base): grow your coffee under balanced shade rather than open, full sun, because the miner loves hot, sun-baked, dry bushes. Feed, mulch and water the trees so they stay strong and vigorous — a healthy tree carries a little mining without losing yield, and shade keeps the leaves cooler and less inviting to the moth.
Which crops does coffee leaf miner affect?
Among the crops covered here: Arabica coffee.
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.
Check what grows on your farm