Calamondin 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 Calamondin (Citrus x microcarpa), using what its sources say about pests and diseases, humidity and watering and 6 problems recorded for it.
Sources last read 14 September 2026.
Native range: Asia. Also sold as Calamansi, calamondin orange, Panama orange, Philippine lemon and Philippine lime.
What Calamondin’s sources say that bears on this
- Pests and diseases
- Can be troubled by citrus mealybug, citrus whitefly and citrus leafminer.NC State Extension · read 13 September 2026In a greenhouse, mealybugs, caterpillars, aphids, fluted scale, soft scale, greenhouse red spider mite and citrus red spider mite can occur. Diseases: usually none.RHS · read 13 September 2026
- Humidity
- ASHRAE recommends indoor relative humidity between 30% and 60%Penn State Extension · read 13 September 2026
- Watering
- While growing in spring and summer, water generously and mist every day. Use a citrus fertiliser all year round as directed by the manufacturer; give little water in winter.RHS · read 13 September 2026
How this shows up on a Calamondin
Curled, sticky new leaves with green or black insects: aphids
The youngest growth of the calamondin is sticky and distorted, and a closer look finds colonies of small, pear-shaped insects.
RHS lists aphids among the pests it may attract. They feed on the sap of soft new growth, which distorts it, and they multiply quickly without mating.
Telling it apart: What the white bits are. Aphids leave papery cast skins; mealybugs leave wax with an insect inside.
RHS · read 13 September 2026Fine pale speckling on the leaves, then webbing at the tips: spider mites
Speckling spreads over the calamondin 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. Heated rooms suit them: dry, warm air speeds each generation, and the damage builds within weeks.
Telling it apart: Webbing. Only mites spin fine silk at the shoot tips.
RHS · read 13 September 2026Holes chewed in the leaves, with droppings: a caterpillar pest
The calamondin loses leaf tissue quickly. Caterpillars hide on the undersides or inside rolled leaves.
RHS lists caterpillars among the pests it may attract. They grow fast and eat more as they grow, so damage accelerates.
Telling it apart: Holes or notches. Caterpillars eat through the leaf; vine weevil adults bite notches from the edge.
RHS · read 13 September 2026Small white flying insects under the leaves
The leaves of the calamondin yellow and grow sticky, sometimes dusted black, and white insects rest on the undersides.
NC State Extension lists whitefly among the pests it may attract. Adults and young feed on sap from the undersides and shed honeydew, and warm indoor conditions keep them breeding.
Telling it apart: Stickiness with flying insects. Whitefly has both; fungus gnats fly but leave no honeydew.
NC State Extension · read 13 September 2026Sticky leaves and immobile shell-like insects on the stems
Rows of small, hard scales sit where the veins of the calamondin are thickest, and the surface below them is glossy with honeydew.
RHS lists scale insects among the pests it may attract. The insect settles under a waxy shell and feeds on sap for life, so a colony builds quietly along the stems.
Telling it apart: Stickiness below the bumps. Scale drips honeydew; a leaf spot is dry.
RHS · read 13 September 2026White, cottony tufts in the joints of the leaves: mealybugs
Look into the tightest angles of the canopy: white woolly patches there are mealybug colonies, often with a sticky sheen on the leaves below them.
RHS lists mealybugs among the pests it may attract. Mealybugs pierce the stem and draw sap, which weakens new growth and leaves a sticky residue.
Telling it apart: Whether the white comes with stickiness. Mealybugs leave honeydew; dust and mildew do not.
RHS · read 13 September 2026Possible causes, likeliest first for a Calamondin
Most likely spider mites
Ranked higher because Calamondin's recorded problems point this way.
- Fine pale speckling on the leaves, then webbing at the tips: spider mites RHS
Why: Spider mites feed on individual leaf cells, and each emptied cell shows as a pale speck.
What to try:
- Move the calamondin 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 Calamondin's recorded problems point this way.
- White, cottony tufts in the joints of the leaves: mealybugs RHS
Why: Mealybugs are soft insects that cover themselves in white wax, which gives the cottony look.
What to try:
- Move the calamondin 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
Ranked higher because Calamondin's recorded problems point this way.
- Sticky leaves and immobile shell-like insects on the stems RHS
Why: Scale insects settle in one place under a hard or waxy shell and feed on sap.
What to try:
- Move the calamondin 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 calamondin does not move.
Less likely for a Calamondin, still possible
Questions
- What usually causes pests on a Calamondin?
- For Calamondin: spider mites, mealybugs and scale insects.
- How can I tell which one it is on my Calamondin?
- 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 Calamondin's sources say about its pests and diseases?
- NC State Extension: Can be troubled by citrus mealybug, citrus whitefly and citrus leafminer. RHS: In a greenhouse, mealybugs, caterpillars, aphids, fluted scale, soft scale, greenhouse red spider mite and citrus red spider mite can occur. Diseases: usually none.
- What does this look like on a Calamondin?
- The youngest growth of the calamondin is sticky and distorted, and a closer look finds colonies of small, pear-shaped insects. Telling it apart: What the white bits are. Aphids leave papery cast skins; mealybugs leave wax with an insect inside.
- Is Calamondin safe to handle while I check it?
- Its sources list it as toxic to cats, dogs and people. Wash your hands after handling the roots or sap, and keep trimmings away from pets.
Other plants that show pests
LemonFine pale speckling on the leaves, then webbing at the tips: spider mites
AvocadoPale stippled leaves and tiny moving dots underneath: a mite pest
Bay laurelRagged, eaten leaves and rolled leaves: an insect pest
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
Something else wrong with the Calamondin?
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.