Bay laurel 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 Bay laurel (Laurus nobilis), using what its sources say about pests and diseases and humidity and 2 problems recorded for it.
Sources last read 14 September 2026.
Laurus nobilis is an aromatic evergreen tree or large shrub with green, glabrous (smooth) leaves. It is in the flowering plant family Lauraceae. Wikipedia, CC BY-SA 4.0
Native range: Medit. (subtropical). Also sold as bay, Bay Leaf Tree, Bay Tree, Grecian Laurel, Laurel and Laurel Tree.
What Bay laurel’s sources say that bears on this
- Pests and diseases
- Can be troubled by yellow poplar weevil. Diseases: laurel wilt.NC State Extension · read 13 September 2026Can be troubled by tortrix moth, soft scale, horse chestnut scale and bay sucker. Diseases: a leaf spot, powdery mildews and, rarely, honey fungus.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 Bay laurel
Ragged, eaten leaves and rolled leaves: an insect pest
The bay laurel 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: Whether tissue is missing. Chewing pests remove it; sap-feeders only discolor it.
RHS · read 13 September 2026Small raised bumps along the stems and veins, with sticky leaves: scale insects
Flat or domed bumps, tan to dark, line the stems and the midribs of the bay laurel. They do not move, and the leaves beneath them are sticky or dusted black.
RHS lists scale insects among the pests it may attract. Each scale sits in one place drawing sap and dripping honeydew, which is why the leaves below turn sticky.
Telling it apart: Whether the bumps sit on the veins. Scale follows the sap; spots from disease scatter across the leaf.
RHS · read 13 September 2026Possible causes, likeliest first for a Bay laurel
Most likely scale insects
Ranked higher because Bay laurel's recorded problems point this way.
- Small raised bumps along the stems and veins, with sticky leaves: scale insects RHS
Why: Scale insects settle in one place under a hard or waxy shell and feed on sap.
What to try:
- Move the bay laurel 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 bay laurel 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 bay laurel 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
Why: Mealybugs are soft insects that cover themselves in white wax, which gives the cottony look.
What to try:
- Move the bay laurel 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 Bay laurel, still possible
Questions
- What usually causes pests on a Bay laurel?
- For Bay laurel: scale insects, spider mites and mealybugs.
- How can I tell which one it is on my Bay laurel?
- 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 Bay laurel's sources say about its pests and diseases?
- NC State Extension: Can be troubled by yellow poplar weevil. Diseases: laurel wilt. RHS: Can be troubled by tortrix moth, soft scale, horse chestnut scale and bay sucker. Diseases: a leaf spot, powdery mildews and, rarely, honey fungus.
- What does this look like on a Bay laurel?
- The bay laurel loses leaf tissue quickly. Caterpillars hide on the undersides or inside rolled leaves. Telling it apart: Whether tissue is missing. Chewing pests remove it; sap-feeders only discolor it.
- Is Bay laurel 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
AvocadoPale stippled leaves and tiny moving dots underneath: a mite 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 Bay laurel?
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.