Avocado spots on leaves: causes and what to do
8 results in the diagnosis tree begin with spots on the leaves, 5 of them marked likely when the answers fit. They are ordered here for Avocado (Persea americana), using what its sources say about light, soil moisture, humidity and pests and diseases and 3 problems recorded for it.
Sources last read 14 September 2026.
The avocado, alligator pear or avocado pear is an evergreen tree in the laurel family (Lauraceae). It is native to the Americas, with archaeological evidence of early human avocado use dating back thousands of years across various regions of Central and South America. Wikipedia, CC BY-SA 4.0
Native range: C. Mexico to Costa Rica (seasonally dry tropical). Also sold as aguacate, alligator pear, avocado pear, midshipman's butter, palta and vegetable marrow.
What Avocado’s sources say that bears on this
- Light
- Full sun, Partial shadeRHS · read 13 September 2026
- Soil moisture
- Moist but well-drained or Well-drainedRHS · read 13 September 2026
- Humidity
- ASHRAE recommends indoor relative humidity between 30% and 60%Penn State Extension · read 13 September 2026
- Pests and diseases
- Diseases: laurel wilt.NC State Extension · read 13 September 2026Mealybug, greenhouse red spider mite, thrips and greenhouse whitefly can be troublesome. Disease risks: Phytophthora root rot and fungal leaf spots.RHS · read 13 September 2026
How this shows up on an Avocado
Dry scorched spots after a move into a sunnier spot
Upper surfaces lose colour while the undersides stay green, and nothing below the top of the canopy is touched.
Its source names full sun, partial shade, yet a leaf grown in lower light has thinner tissue than one grown in sun, and it scorches if moved into strong light in one step.
Telling it apart: Whether it appeared after a move. Scorch follows a change in position within days.
RHS · read 13 September 2026Round leaf spots, some with a paler ring
Brown to black spots appear on the leaves of the avocado, often ringed with yellow, and enlarge until patches of the leaf die.
RHS lists leaf spot among the diseases it may get. Wet foliage, crowding and still air are what let the spots spread from leaf to leaf.
Telling it apart: Where the spots are. Disease scatters spots anywhere, often where water sits; cold damage and scorch mark one side.
RHS · read 13 September 2026Silvery patches dotted with tiny black spots: thrips
The surface of the leaves of the avocado looks scraped and silvered, and slender insects smaller than a grain of rice run or jump when disturbed.
RHS lists thrips among the pests it may attract. They rasp the surface cells and drink the contents, which leaves the silvered, empty tissue.
Telling it apart: The black specks. Silvering with black dots is thrips; pale dots without them point at mites.
RHS · read 13 September 2026Possible causes, likeliest first for an Avocado
Most likely thrips
Ranked higher because Avocado's recorded problems point this way.
- Silvery patches dotted with tiny black spots: thrips RHS
Why: Thrips rasp the leaf surface and drink what leaks out, which leaves silvery, papery streaks.
What to try:
- Move the avocado away from other plants.
- Wash the leaves thoroughly and remove badly damaged ones.
What would settle it: Tap a leaf over white paper. Thrips are slender, fast-moving and about the size of a comma; they are easy to see once they are on paper.
Most likely a leaf-spot infection
Ranked higher because Avocado's recorded problems point this way.
- Round leaf spots, some with a paler ring RHS
Why: Spots with a yellow ring around them are the mark of a fungus or bacterium spreading through the leaf, the ring being tissue that is dying ahead of it.
What to try:
- Remove the affected leaves and put them in the bin rather than the potting mix.
- Water the soil rather than the leaves, and stop misting.
What would settle it: Whether the spots grow. Mark the edge of one with a pencil dot and look again in a week; an infection advances, damage from a single event does not.
Most likely spider mites
Why: Spider mites feed on individual leaf cells, and each emptied cell shows as a pale speck.
What to try:
- Move the avocado away from other plants.
- Wash the leaves, top and underside, with a strong spray of water in a shower or sink.
What would settle it: Hold a sheet of white paper under a leaf and tap the leaf. Tiny specks that move across the paper are mites.
Less likely for an Avocado, still possible
Questions
- What usually causes spots on the leaves on an Avocado?
- For Avocado: thrips, a leaf-spot infection and spider mites.
- How can I tell which one it is on my Avocado?
- What do the marks look like? Pale, dry, bleached patches on the side facing the window; Brown or black spots, many with a yellow ring around them; Tiny pale speckles all over, sometimes with fine webbing underneath; A white powdery coating that wipes off; Silvery streaks with tiny black dots; Dark, soft, water-soaked patches.
- What do Avocado's sources say about its light?
- RHS: Full sun, Partial shade.
- What does this look like on an Avocado?
- Upper surfaces lose colour while the undersides stay green, and nothing below the top of the canopy is touched. Telling it apart: Whether it appeared after a move. Scorch follows a change in position within days.
Other plants that show spots on the leaves
Bay laurelDark spots with a yellow halo spreading across the leaves
Chinese banyanSilvery patches dotted with tiny black spots: thrips
Common figWashed-out patches that do not spread to the shaded side
Japanese mapleScorched patches on the side facing the wind
LemonBleached patches on the side facing the glass
Money treeDark spots with a yellow halo spreading across the leaves
Something else wrong with the Avocado?
What this does not cover
This page orders a decision tree's results using a plant's sourced care. It has not seen your plant, its pot or its window, and two problems at once are common: that is the usual reason a confident answer turns out wrong. The questions in the diagnosis tool narrow it further than a list can.