Snake plant 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 Snake plant (Dracaena trifasciata), using what its sources say about pests and diseases, humidity and watering and 4 problems recorded for it.
Sources last read 14 September 2026.
Dracaena trifasciata is a species of flowering plant in the family Asparagaceae, native to tropical West Africa from Nigeria east to the Congo. It is most commonly known as the snake plant, Saint George's sword, mother-in-law's tongue, and viper's bowstring hemp, among other names. Wikipedia, CC BY-SA 4.0
Native range: S. Nigeria to WC. Trop. Africa, Tanzania (seasonally dry tropical). Also sold as Golden Birds Nest, Good Luck Plant, mother-in-law's nose, Mother-in-law's Tongue, three-striped dragon tree and viper's bowstring hemp.
What Snake plant’s sources say that bears on this
- Pests and diseases
- Can be troubled by banded greenhouse thrips, fern scale and longtailed mealybug.NC State Extension · read 13 September 2026Vine weevil can attack it. Disease is uncommon.RHS · read 13 September 2026
- Humidity
- ASHRAE recommends indoor relative humidity between 30% and 60%Penn State Extension · read 11 September 2026
- Watering
- It needs soil that drains well and careful watering; avoid overwatering, which rots the roots. From spring to autumn, let the soil dry between waterings.NC State Extension · read 13 September 2026
How this shows up on a Snake plant
Hard, rounded scale on the undersides of the blades
Rows of small, hard scales sit where the veins of the snake plant are thickest, and the surface below them is glossy with honeydew.
NC State Extension 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: Flick a bump with a fingernail. Scale comes away and leaves a mark; a natural bump on the stem does not move.
NC State Extension · read 13 September 2026Irregular notches bitten from leaf edges by an insect pest
The clump rocks loose in its pot and droops, and the root ball holds curled white grubs among chewed roots.
RHS lists vine weevil among the pests it may attract. Grubs hatch in the potting mix and eat the roots out of sight, so a plant in a pot can collapse with little warning.
Telling it apart: The shape of the damage. Weevils bite notches from the edge; caterpillars eat holes anywhere.
RHS · read 13 September 2026Silvery streaks with black specks on the blades: thrips
The surface of the blades of the snake plant looks scraped and silvered, and slender insects smaller than a grain of rice run or jump when disturbed.
NC State Extension lists thrips among the pests it may attract. They feed on leaves and in flowers, and hide in buds, which makes them hard to spot.
Telling it apart: Whether the marks are silver. Thrips leave a sheen; sun scorch leaves dry, bleached tissue.
NC State Extension · read 13 September 2026Small white woolly insects tucked into the leaf joints
The snake plant carries white, cottony specks in its crevices, and growth slows. Leaves beneath the colonies turn sticky and, in time, dull or yellow.
NC State Extension lists mealybugs among the pests it may attract. They feed on sap and shed the excess as sticky honeydew, and a colony tucked into the joints spreads before it is noticed.
Telling it apart: Wipe a tuft with a cotton swab. An insect smears or crawls; a mineral deposit or a hair does not.
NC State Extension · read 13 September 2026Possible causes, likeliest first for a Snake plant
Most likely mealybugs
Ranked higher because Snake plant's recorded problems point this way.
- Small white woolly insects tucked into the leaf joints NC State Extension
Why: Mealybugs are soft insects that cover themselves in white wax, which gives the cottony look.
What to try:
- Move the snake plant 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 Snake plant's recorded problems point this way.
- Hard, rounded scale on the undersides of the blades NC State Extension
Why: Scale insects settle in one place under a hard or waxy shell and feed on sap.
What to try:
- Move the snake plant 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 snake plant does not move.
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 snake plant 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 a Snake plant, still possible
Questions
- What usually causes pests on a Snake plant?
- For Snake plant: mealybugs, scale insects and spider mites.
- How can I tell which one it is on my Snake plant?
- 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 Snake plant's sources say about its pests and diseases?
- NC State Extension: Can be troubled by banded greenhouse thrips, fern scale and longtailed mealybug. RHS: Vine weevil can attack it. Disease is uncommon.
- What does this look like on a Snake plant?
- Rows of small, hard scales sit where the veins of the snake plant are thickest, and the surface below them is glossy with honeydew. Telling it apart: Flick a bump with a fingernail. Scale comes away and leaves a mark; a natural bump on the stem does not move.
- Is Snake plant 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
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
Madagascar dragon treePale stippled leaves and tiny moving dots underneath: a mite pest
Ponytail palmHard, rounded scale on the undersides of the blades
Something else wrong with the Snake plant?
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.