Avocado pests, webbing or sticky leaves: causes and what to do
6 results in the diagnosis tree begin with pests, 5 of them marked likely when the answers fit. They are ordered here for Avocado (Persea americana), using what its sources say about pests and diseases, humidity and watering and 4 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
- 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
- Humidity
- ASHRAE recommends indoor relative humidity between 30% and 60%Penn State Extension · read 13 September 2026
- Watering
- Avocado can also be kept as a houseplant, particularly where the climate is less suitable, starting from a seed that has sprouted in water or one sown straight into soil. Its seeds sprout fast and easily, with or without toothpicks crossed over a glass of water to hold them.NC State Extension · read 13 September 2026
How this shows up on an Avocado
Pale stippled leaves and tiny moving dots underneath: a mite pest
Speckling spreads over the avocado until the leaves look washed out and bronze, with fine threads at the growing points.
RHS lists spider mites among the pests it may attract. Mites empty the leaf cells one by one, which is what the pale dots are, and they breed fastest in warm, dry air.
Telling it apart: Where the damage starts. Mites stipple the whole leaf in fine dots; sun scorch bleaches the side facing the window.
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 2026Small white flying insects under the leaves
Brushing the avocado lifts a cloud of tiny white insects. The undersides of the leaves carry pale, scale-like young, and the surfaces below are sticky.
RHS lists whitefly among the pests it may attract. The young stay fixed under the leaves feeding, so the population keeps growing after the adults are cleared.
Telling it apart: Stickiness with flying insects. Whitefly has both; fungus gnats fly but leave no honeydew.
RHS · read 13 September 2026Sticky leaves and white fluff where they meet the stem: mealybugs
Clusters of white wax sit where each leaf joins the stem and along the undersides of the avocado. Lifted with a cotton swab, each tuft holds a soft, pale insect, and the leaves below are sticky.
RHS lists mealybugs among the pests it may attract. The wax keeps them dry and hard to reach, so they multiply in the sheltered joints of the canopy.
Telling it apart: Wipe a tuft with a cotton swab. An insect smears or crawls; a mineral deposit or a hair does not.
RHS · read 13 September 2026Possible causes, likeliest first for an Avocado
Most likely spider mites
Ranked higher because Avocado's recorded problems point this way.
- Pale stippled leaves and tiny moving dots underneath: a mite pest RHS
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.
Most likely mealybugs
Ranked higher because Avocado's recorded problems point this way.
- Sticky leaves and white fluff where they meet the stem: mealybugs RHS
Why: Mealybugs are soft insects that cover themselves in white wax, which gives the cottony look.
What to try:
- Move the avocado away from other plants.
- Wipe off every insect you can see with a cotton swab dipped in rubbing alcohol, testing a single leaf first.
What would settle it: Touch a tuft with a cotton swab. If a small, pale, oval insect is underneath, it is a mealybug.
Most likely scale insects
Why: Scale insects settle in one place under a hard or waxy shell and feed on sap.
What to try:
- Move the avocado away from other plants.
- Scrape the scales off with a fingernail or a soft brush, then wipe the stems and leaves.
What would settle it: Push a bump gently with a fingernail. Scale comes away and leaves a mark; a bump that is part of the avocado does not move.
Less likely for an Avocado, still possible
Questions
- What usually causes pests on an Avocado?
- For Avocado: spider mites, mealybugs and scale insects.
- How can I tell which one it is on my Avocado?
- What can you see? Fine webbing, and tiny pale speckles on the leaves; White, cottony tufts in the leaf joints; Small brown or pale bumps on stems and leaves that do not move; Clusters of small, soft insects on the new growth; Tiny dark flies around the soil; Sticky, shiny residue, but no insect I can see.
- What do Avocado's sources say about its pests and diseases?
- NC State Extension: Diseases: laurel wilt. RHS: Mealybug, greenhouse red spider mite, thrips and greenhouse whitefly can be troublesome. Disease risks: Phytophthora root rot and fungal leaf spots.
- What does this look like on an Avocado?
- Speckling spreads over the avocado until the leaves look washed out and bronze, with fine threads at the growing points. Telling it apart: Where the damage starts. Mites stipple the whole leaf in fine dots; sun scorch bleaches the side facing the window.
Other plants that show pests
Bay laurelRagged, eaten leaves and rolled leaves: an insect pest
CalamondinCurled, sticky new leaves with green or black insects: aphids
Chinese banyanPale stippled leaves and tiny moving dots underneath: a mite pest
Coffee plantFine pale speckling on the leaves, then webbing at the tips: spider mites
Common figDull, finely mottled leaves and faint webs: spider mites
Crape myrtleClusters of small soft insects on the shoot tips and buds: aphids
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.