Free · on your device · works offline
What is wrong with this leaf?
Photograph one sick leaf. LeafScan names the likely problem, says how sure it is, and shows what you can do, summarized from published expert sources.
- 1Photograph one leaf in even light.
- 2Fit the leaf inside the square.
- 3Compare the signs, then act.
Photo of the leaf
Photograph one leaf
The photo never leaves your device.
Drag or pinch so one leaf fills the square.
Add another leaf from the same plant. Results from all leaves are combined.
Loading the AI model…
Help narrow it down
Look closely at the leaf (or other leaves on the plant).
What it looks like
Does your leaf show these signs?
What you can do
In the Philippines · Sa Pilipinas
Other possibilities
Also common in the Philippines
LeafScan cannot recognize these from a photo yet. Compare the signs, and ask a plant clinic if they match.
Study log
Study mode is on. Fill in what you know and save; the photo and these details stay on this phone until you export them from History.
Was this result right?
Answer once a technician or plant clinic has checked it, or the plant shows clearer signs. You can also answer later under History. Saved only on this device.
Expert sources
Still not sure, or many plants are sick?
Ask a plant clinic for a second opinion:
- Bureau of Plant Industry (BPI), Crop Pest Management Division, Quezon City: diagnoses plant samples free of charge for farmers and students. Bring freshly collected sick plants (and whole insects) and fill in their diagnosis form. BPI service guide
- UPLB Pest Clinic: send fresh sick leaves by courier, and they email a diagnosis report, usually within 7 working days. How to send a sample
- DA Regional Crop Protection Center at your Department of Agriculture regional office. Some run a Plant Health Clinic.
- An agriculture teacher, or the agriculture college of a state university near you.
To send a sample: wrap several fresh sick leaves (and the stem if it is affected) in dry paper, put them in a plastic bag, and send them the same day. Include photos and this result.
This is a research prototype and can be wrong. Before you spray or remove plants, confirm the diagnosis with an agricultural technician or a plant clinic, and use only products registered with the Fertilizer and Pesticide Authority (FPA), or with DA-BAFS for organic and biological products, following the label.
Saved only on this device
History
Your last eight scans. Once you know the real cause, mark each one right or wrong to see how often LeafScan is right for you.
No scans yet. Results you check appear here.
Study log
Add who confirmed each photo once a teacher or plant clinic has checked it. Exports are a ZIP with the photos and a photo_log.csv in the study's columns.
What LeafScan knows
Supported plants
The plants and problems LeafScan can recognize, with healthy leaves of each plant.
No plant or problem matches that. LeafScan may not know it yet.
Guide
Using LeafScan well
How to take a photo it can read, what its answers mean, and where to get a second opinion.
Taking a good photo
- One leaf that fills most of the square, showing the side with the spots.
- Hold the phone flat above the leaf and keep still. Tilted or blurry photos are often wrong.
- Even light: shade or near a window, no harsh shadows or dark corners.
- Plain background if you can, such as paper, a table or your palm.
- If the result is not sure, add 2 or 3 leaves from the same plant. More leaves give a more reliable answer.
Reading the result
LeafScan was tested on 3,583 field photos from public datasets that it had never seen (not yet photos from Philippine farms). Each photo is checked three ways (your square, the square mirrored, and the whole photo) and the answers are combined. This is how often it was right at each level:
- High confidence 70% and above
- Right about 9 in 10 times. Still compare the signs before you act.
- Medium confidence 45 to 70%
- Right about 7 in 10 times. Answer the questions or add another leaf.
- Not sure below 45%
- Right only about 4 in 10 times. It does not mean the plant is healthy.
- Not recognized below 30%
- The photo may not be a leaf, or a plant LeafScan knows.
Tell LeafScan the plant if it guessed wrong. Use “Wrong plant?” on the result. On the same test photos, choosing the right plant raised accuracy from 77% to 91%.
Cucumber, squash and zucchini look alike. When LeafScan is not told the plant, it names the problem for the whole squash family (the same disease has the same cause and care on all three). On 301 test photos of these plants this raised right answers from 63% to 79%. Choose your plant to narrow it down.
Getting a second opinion
- Bureau of Plant Industry (BPI), Crop Pest Management Division, Quezon City: free diagnosis for farmers and students. Bring freshly collected sick plants (and whole insects) and fill in their diagnosis form; results that need a lab culture take about 1 to 6 days. BPI service guide
- UPLB Pest Clinic: send fresh sick leaves by courier, and they email a diagnosis report, usually within 7 working days. How to send a sample
- DA Regional Crop Protection Center at your Department of Agriculture regional office. Some run a Plant Health Clinic.
- An agriculture teacher, or the agriculture college of a state university near you.
Use “Show to a technician” on a result to send the leaf photos and LeafScan's answer together.
Philippine rules for treating plants
- Registered products only. Chemical pesticides must be registered with the Fertilizer and Pesticide Authority (FPA); organic and biological products (botanicals, microbials) are registered with DA-BAFS (RA 11511). Check the active ingredient, that your crop is on the label, and that the registration has not expired. Some pesticides are banned or restricted.
- Neem and soap sprays are insect controls, not disease cures. In the FPA list (30 September 2026), neem (azadirachtin) is registered only as an insecticide for certain crops, and insecticidal soap only for Cavendish banana. LeafScan suggests them only against the insects that spread viruses.
- Do not burn sick plants in the open. The Ecological Solid Waste Management Act (RA 9003) bans open burning of farm waste. Uproot sick plants, and bury them or seal them in a bag away from the field.
- Homemade plant sprays are not proven against diseases. In a DOST-PCAARRD and UPLB project, some local plant extracts killed insect pests, but plain extracts did not stop plant pathogens in lab tests, and none stopped bacterial wilt.
- Some diseases are under quarantine. Panama disease (Fusarium wilt) of banana, coconut cadang-cadang, cassava witches' broom and citrus huanglongbing have BPI or PCA rules against moving planting material. Do not move plants, suckers, cuttings or soil from a sick farm; report it to the DA regional office, BPI or PCA.
- Spraying comes last. Philippine guides and the national IPM program (KASAKALIKASAN) put sanitation, crop rotation, resistant varieties and healthy seedlings first.
Words farmers use · Mga salita
Philippine extension guides keep most disease names in English and describe the signs in Filipino. These words come from PhilRice, DA and ATI materials.
| English | Filipino | Cebuano |
|---|
Study mode (for the research team)
Turn this on while collecting photos for the study. After each check, a short form records where and how the photo was taken, and History gets a study log you can export as photos plus a photo_log.csv. Everything stays on this phone until you export it.
About LeafScan
A student research prototype: Developing a Prototype for Plant Disease Detection Using Image Recognition. A MobileNetV3 image recognition model runs entirely on your device with ONNX Runtime Web, so photos are never uploaded. Disease information is summarized from CABI, PlantVillage (Penn State) and university extension sources, with Philippine notes from PhilRice, DA regional offices, ATI, BPI, DOST-PCAARRD and UPLB, and scientific names checked against GBIF. Summaries have not yet been reviewed by a plant pathologist. Non-commercial use only.
Copyright. © 2026 the LeafScan student research team. The app's code, design, model and texts are not licensed for reuse: please do not copy, modify or republish them, or present LeafScan as your own work, without the team's permission. The knowledge-base summaries are shared under CC BY-NC-SA 4.0 as their sources require, and third-party parts keep their own licences (see LICENSE.md in the app's repository).