What's Wrong With My Plant Leaves? Free Disease Identifier

What the plant disease identifier looks for

Damaged leaves show patterns, and those patterns point to causes. This free tool reads leaf spots and lesions, powdery or downy mildew, rust-colored pustules, blight, yellowing, browning at the margins, and holes or trails from pests. It weighs where the damage sits and how it spreads, then names the most likely diseases or pests behind what it sees.

• Spots, rings, or lesions and the color of their edges.
• Powdery white coating or fuzzy growth on leaf surfaces.
• Rust-orange pustules, black patches, or mosaic mottling.
• Chewed edges, holes, webbing, or sticky residue from insects.

How to photograph a diseased leaf

The tool works best when the symptoms fill the frame. Shoot the affected area up close in bright, indirect daylight so colors stay true, then step back for one photo of the whole plant. A plain background and sharp focus on the spots, coating, or discoloration help the tool tell one cause from another.

• Get a close-up where the symptom is clearest and in focus.
• Keep colors accurate with daylight, not colored indoor bulbs.
• Include a healthy part of the leaf for comparison.
• Add a wide shot showing how many leaves are affected.

Reading a likely diagnosis and common lookalikes

Results are a likely diagnosis, not a guaranteed one. Several problems mimic disease: sun scorch browns leaf edges like blight, nutrient deficiency yellows leaves like some infections, and herbicide drift can twist growth in confusing ways. Read the symptom pattern the tool matched, then check whether watering, light, or recent sprays could explain what you see.

A photo cannot culture a pathogen or test your soil, so it will not name every fungus, bacterium, or virus with certainty. Some diseases look identical on the leaf and differ only under a microscope. Use the result to narrow the possibilities and to decide what to inspect or test next.

General care pointers, and when it's bigger than one plant

Once you have a likely cause, general garden hygiene helps more than a single spray. Remove and bin badly affected leaves, water at the base to keep foliage dry, improve airflow between plants, and clean tools between cuts. These are general pointers, not a guaranteed cure — the right treatment depends on the exact cause and your local conditions.

When a problem threatens a food crop, spreads fast, or hits many plants at once, it is worth expert eyes. Your local cooperative extension service can identify regional diseases and pests and recommend approved, area-specific controls that a photo tool cannot.

When to escalate: better photos, the app, or an expert

Start with a sharper photo if the first result seems off — focus, daylight, and a close-up of the symptom fix most uncertain reads. Continue in the Leaf Identifier app to track a plant's progress over several photos. For crop-critical, fast-spreading, or stubborn problems, contact your local extension service or a plant pathologist for hands-on diagnosis.