ecoLeaf symptoms

Leaf Spot

Dry, wet, or corky spots on indoor plant leaves — most commonly caused by fungal leaf spot, bacterial leaf spot, or overwatering-related edema.

Moderate RiskEasy to DiagnoseFungal or Bacterial

reportSeverity hint

Leaf spots spread to new leaves via water splash if watering habits are not corrected; established spots will not heal, but the plant usually recovers with prompt adjustment.

Key Symptoms

Match the visible pattern before looking for causes.

Circular dry spots on the leaves

Your leaves show roughly round, dry-looking spots ranging from pale tan to dark brown or black. They're usually the first sign you notice.

Spots that grow and merge into blotches

Over time individual spots can spread and run together into larger irregular patches that can kill the whole leaf.

Wet, greasy, or translucent spots

Some spots look shiny, wet, or see-through when you hold the leaf up to the light, and they often start along the leaf edges.

Raised bumps or rough corky scabs

On the undersides of leaves you may see raised blisters that dry out into rough, rust-colored, corky scabs that don't spread to other leaves.

Tiny black dots inside larger old spots

Inside the biggest, oldest spots you might see clusters of tiny black pinhead dots or a target-like ring pattern.

Start With What You See

Choose the situation that best matches your plant.

You have dry-looking, tan, brown, or black spots on the leaves, often roughly round, and the largest old spots show tiny black dots inside

Dry spots with tiny black fruiting dots are the classic sign of a fungal leaf spot. The fungus spreads from leaf to leaf by water splash.

Quick check

Look at the biggest old spot with a magnifying glass or a phone camera held very close — do you see tiny black dots inside the dead tissue?

Likely cause: Fungal Leaf Spot

See Treatmentarrow_forward

Spots look wet, greasy, or translucent when you hold the leaf up to the light, and they appeared or spread after water sat on the foliage

Wet-looking, greasy spots that ooze are typical of a bacterial leaf spot, which thrives when leaves stay wet in warm, humid air.

Quick check

Press the edge of one fresh spot with a clean tissue — does it feel wet and leave a sticky or cloudy smear?

Likely cause: Bacterial Leaf Spot

See Treatmentarrow_forward

Spots started as raised bumps or blisters on the undersides of the leaves, then turned into rust-colored, rough, corky scabs, and they don't spread to other leaves

Raised, corky bumps that don't spread are usually overwatering-related edema — constant water pressure burst the leaf cells. A soggy spell, or a heavy watering after a dry stretch, makes this very likely. It isn't contagious and won't move to other leaves.

Quick check

Feel the soil about 2 inches deep — is it still wet several days after your last watering?

Compare Common causesarrow_forward

Not sure, or the spots look like more than one of these at once

Walk through a short step-by-step diagnosis to narrow down whether the cause is fungal, bacterial, or watering-related.

Continue to Diagnostic flowarrow_forward

Common Causes

Start from the top. Match what you can observe, then use one check to confirm.

Fungal Leaf Spot

Best Match If

checkSpots are dry-looking and tan to reddish-brown or black, often roughly circular
checkTiny black pinhead dots sit inside the dead tissue of older spots
checkSome spots show a concentric ring or target-like pattern
checkSpots may run together into large irregular blotches that kill the whole leaf
checkNew spots keep appearing after water has been splashed or misted onto the leaves

Next Check

Look at the largest old spot through a magnifying glass (or a phone camera held very close). If you see tiny black dots inside the dead brown tissue, this is a fungal leaf spot.

Why It Happens

Fungal spores land on your leaves, and when the leaf surface stays wet from splashing water, misting, or high room humidity they germinate and grow into the leaf tissue. The fungus kills the patches of cells it feeds on, and the dead tissue turns into the spots you see. The infection spreads leaf to leaf by water splash, and over time older spots develop black fruiting dots or rings as the fungus matures.

Bacterial Leaf Spot

Best Match If

checkSpots look wet, greasy, or translucent when you hold the leaf up to the light
checkA fresh spot may release a sticky or cloudy ooze when pressed with a tissue
checkSpots are angular or V-shaped, staying between the leaf veins
checkSpots enlarge and run together quickly in wet or humid conditions but stop spreading when the plant is kept dry
checkSpots often start along the leaf edges, sometimes followed by leaf drop

Next Check

Press the edge of one fresh spot with a clean tissue. If it feels wet and leaves a sticky or cloudy smear on the tissue, a bacterial infection is the likely cause.

Why It Happens

Bacteria enter leaves through tiny openings along the leaf edges (hydathodes), usually when water is splashed or left sitting on foliage in warm, humid air. They multiply in the moisture between leaf cells, killing the tissue and filling it with water, which is why the spots look wet or greasy instead of dry. The infection can spread quickly in wet conditions, and in some plants it moves into the whole plant.

Overwatering (Edema)

Best Match If

checkSpots start as raised bumps or blisters, often on the undersides of leaves
checkOlder bumps turn into rust-colored, corky, rough-textured scabs
checkThe spots do not spread to other leaves or enlarge over time
checkThe soil went through a dry stretch followed by a heavy watering, or the pot sat in a water-filled saucer
checkThe plant is a succulent or thick-leaved type kept in low light, often during winter

Next Check

Feel the soil about 2 inches deep. If it is still wet several days after your last watering, moisture stress from overwatering is the likely cause.

Why It Happens

When roots take up water faster than the leaves can release it — after a heavy watering on very dry soil, or when the soil stays soggy in low light and cool air — water pressure inside leaf cells builds up until the cells burst. The burst cells collapse into blisters that dry into rust-colored corky scabs, the spots you see. This is not contagious: once you correct the watering, no new spots form.

Diagnostic Flow

Check these in order. If one answer lands on a likely conclusion, treat that as your stopping point before moving into the matching treatment.

Do the spots look dry and flat, rather than wet, greasy, or raised?

If noWet, greasy, or translucent when held up to the light

Likely cause

Bacterial Leaf Spot

Wet, greasy spots mean bacteria are multiplying inside the leaf tissue — keep the foliage dry and follow the bacterial leaf spot treatment.

If yesDry and flat — tan, brown, or black, and often roughly round

Dry, flat spots point toward a fungus — in the next step, check the largest old spot for tiny black dots inside the dead tissue.

If noRaised bumps or rough corky scabs, mainly on leaf undersides

Raised, corky blisters usually come from overwatering edema rather than an infection — keep going and the soil-moisture check in the final step will confirm it.

Not sureNot sure — hard to describe the look

Compare your spots with the causes list — the biggest clue is whether they feel dry, wet, or raised, and a one-time soil check helps separate edema.

Look at the largest, oldest spot up close — do you see tiny black dots inside the dead tissue?

If yesTiny black pinhead dots, or a ring/target pattern

Likely cause

Fungal Leaf Spot

Black fruiting dots inside the dead tissue mean the fungus is maturing and getting ready to spread — start the fungal leaf spot treatment and remove affected leaves.

If noNo dots — the spots look angular or hug the leaf edges

Angular spots that stay between the veins are more typical of bacteria — the next step's tissue press will help separate bacteria from the rest.

Not sureNot sure — the spots are too small to make out

Hold a phone camera very close to zoom in — and the next step, pressing a fresh spot, will still separate bacteria if you can't tell.

Press the edge of one fresh spot with a clean tissue — does it feel wet or leave a sticky smear?

If yesWet — leaves a cloudy, sticky smear on the tissue

Likely cause

Bacterial Leaf Spot

A wet, oozy spot confirms bacteria — the key is keeping the leaves dry and following the bacterial leaf spot treatment.

If noDry — leaves nothing on the tissue

Not bacterial — check the soil next to see whether overwatering (edema) fits instead.

Not sureNot sure — hard to tell, or I'd rather not press it

Skip the press if you prefer — the final soil-moisture check still helps rule edema in or out.

Feel the soil about 2 inches deep — is it still wet several days after your last watering?

If yesStill wet several days after watering

Likely cause

Overwatering (Edema)

Constantly wet soil makes leaves take up water faster than they can release it, bursting cells and forming corky bumps — let the soil dry out before watering again.

If noDry or just slightly moist

Overwatering doesn't fit the soil evidence — compare your spot type against the causes list to pick the best match.

Not sureNot sure — hard to tell if it's wet or dry

Poke a finger 2 inches down — if it's still hard to say, compare your symptoms with the causes list.

Treatment

Start with safe stabilizing actions, then follow the plan that matches the diagnosed cause.

Safe while diagnosing

These low-risk actions help stabilize the plant before you know the exact cause.

checkStop misting the leaves and keep splashes off the foliage for now
checkMove the plant a short distance away from your other houseplants so nothing is touching

Treatment plan by cause

Fungal Leaf Spot

Use this plan if spots are dry-looking and tan to reddish-brown or black, often roughly circular, or tiny black pinhead dots sit inside the dead tissue of older spots.

Today

Pick off every leaf that is mostly or fully spotted and dispose of it
Move the plant to a spot with better air circulation
Water the soil directly so water never sits on the leaves
Clear any fallen spotted leaves off the soil surface

Next a few weeks

Water early in the day each time, so any moisture dries off the leaves before night
Check the leaves about every 3-4 days and pick off any new spotty leaf the moment you see it
Keep the plant where air moves freely until no new spots appear for 2 weeks

What to expect

New spots should stop appearing within 1-2 weeks once the leaves stay dry
Spotted areas are dead tissue and won't turn green again — watch for clean new leaves as the real sign of recovery
If new spots still appear after 2 weeks, remove the spotted leaves and spray with a houseplant-labeled fungicide like copper soap — spray it outdoors and let the plant dry before bringing it back in

Don't do this

Well-meant fixes that can make the problem harder to diagnose.

Misting the leaves regularly to 'raise humidity' for your tropical plant

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Misting barely raises humidity and keeps the leaf surface wet for hours — and wet leaves are exactly what fungal and bacterial leaf spots need to germinate and spread. Extension guidance for leaf spot is to keep the foliage dry and reduce leaf wetness. If the plant really needs more humidity, use a humidifier or a tray of damp pebbles instead.

Cutting the brown spot out of a leaf with scissors to 'save the rest of the leaf'

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Cutting wounds live leaf tissue, and wounds are an entry point for fungi and bacteria. It also risks dragging spores or bacteria around on the blade to other leaves. Remove the whole damaged leaf instead — the spotted tissue is dead and won't recover anyway.

Grabbing a fungicide or neem oil and drenching the whole plant the moment you see one spot

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Spraying before you know the cause does nothing for established spots, and it keeps the foliage wet, which helps the disease spread. Extension sources say to remove the affected leaves and dry out the environment first; fungicides are only an extra step after that, and there is no spray that cures a bacterial infection — RHS advises against fungicides on houseplants altogether.

Watering a spotted plant more because it looks sick

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Leaf spots are driven by moisture, not thirst: fungal and bacterial spots love wet leaves and humid air, and edema happens from too much water, not too little. Overwatering is the number one way houseplants die. Let the soil dry out and water only when the top 2 inches are dry.

Stripping the plant of all its leaves so it can 'start over clean'

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The plant needs its mostly-green leaves to photosynthesize and recover — RHS warns that removing them can delay recovery. Cut off only leaves that are completely brown, dead, or fully spotted, and leave the healthy ones in place.