Madagascar dragon tree 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 Madagascar dragon tree (Dracaena marginata), using what its sources say about pests and diseases and humidity and 3 problems recorded for it.
Sources last read 14 September 2026.
Native range: Mauritius (seasonally dry tropical). Also sold as dragontree.
What Madagascar dragon tree’s sources say that bears on this
- Pests and diseases
- In a greenhouse, scale insects, thrips and greenhouse red spider mite attack it. Disease is uncommon.RHS · read 13 September 2026
- Humidity
- ASHRAE recommends indoor relative humidity between 30% and 60%Penn State Extension · read 13 September 2026
How this shows up on a Madagascar dragon tree
Pale stippled leaves and tiny moving dots underneath: a mite pest
Speckling spreads over the Madagascar dragon tree until the blades 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: Webbing. Only mites spin fine silk at the shoot tips.
RHS · read 13 September 2026Silvery patches dotted with tiny black spots: thrips
The surface of the blades of the Madagascar dragon tree 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 2026Sticky leaves and immobile shell-like insects on the stems
The Madagascar dragon tree is sticky to the touch and yellows slowly. Along the veins on the undersides sit small shell-like scales that lift off with a fingernail.
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 2026Possible causes, likeliest first for a Madagascar dragon tree
Most likely spider mites
Ranked higher because Madagascar dragon tree'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 madagascar dragon tree 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 scale insects
Ranked higher because Madagascar dragon tree'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 madagascar dragon tree 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 madagascar dragon tree does not move.
Most likely mealybugs
Why: Mealybugs are soft insects that cover themselves in white wax, which gives the cottony look.
What to try:
- Move the madagascar dragon tree 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.
Less likely for a Madagascar dragon tree, still possible
Questions
- What usually causes pests on a Madagascar dragon tree?
- For Madagascar dragon tree: spider mites, scale insects and mealybugs.
- How can I tell which one it is on my Madagascar dragon tree?
- 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 Madagascar dragon tree's sources say about its pests and diseases?
- RHS: In a greenhouse, scale insects, thrips and greenhouse red spider mite attack it. Disease is uncommon.
- What does this look like on a Madagascar dragon tree?
- Speckling spreads over the Madagascar dragon tree until the blades look washed out and bronze, with fine threads at the growing points. Telling it apart: Webbing. Only mites spin fine silk at the shoot tips.
- Is Madagascar dragon tree safe to handle while I check it?
- Its sources list it as toxic to cats and dogs. Wash your hands after handling the roots or sap, and keep trimmings away from pets.
Other plants that show pests
Asparagus fernCurled, sticky new fronds with green or black insects: aphids
Cast iron plantIrregular notches bitten from leaf edges by an insect pest
DracaenaFine pale speckling on the blades, then webbing at the tips: spider mites
Lucky bambooSilver-flecked leaves and marked or distorted flowers: an insect pest
Ponytail palmHard, rounded scale on the undersides of the blades
Snake plantHard, rounded scale on the undersides of the blades
Something else wrong with the Madagascar dragon tree?
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.