Carnation 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 Carnation (Dianthus caryophyllus), using what its sources say about pests and diseases and humidity and 2 problems recorded for it.
Sources last read 14 September 2026.
Dianthus caryophyllus, commonly known as carnation or clove pink, is a species of Dianthus native to the Mediterranean region. While its exact natural range is uncertain due to extensive cultivation over the last 2,000 years, wild carnations are most common in the Mediterranean region. Wikipedia, CC BY-SA 4.0
Native range: Balkan Pen. (temperate). Also sold as Border Carnation, carnadine, clove carnation, clove gilliflower, Clove Gilly-flower and clove pink.
What Carnation’s sources say that bears on this
- Pests and diseases
- Aphids and slugs can attack it. Disease risks: Fusarium wilt, a virus, a rust and powdery mildews.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 Carnation
Clusters of small soft insects on the shoot tips and buds: aphids
The youngest growth of the carnation 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 favor tender tips and buds, so the damage concentrates where the plant is growing.
Telling it apart: What the white bits are. Aphids leave papery cast skins; mealybugs leave wax with an insect inside.
RHS · read 13 September 2026Ragged holes and slime trails: a slug or snail pest
The carnation shows ragged holes in new leaves; slugs or snails shelter under the pot rim or nearby by day.
RHS lists slugs and snails among the pests it may attract. New shoots are their preference, so the damage concentrates on young growth.
Telling it apart: Slime. Silvery trails point at slugs or snails; droppings point at caterpillars.
RHS · read 13 September 2026Possible causes, likeliest first for a Carnation
Most likely aphids
Ranked higher because Carnation's recorded problems point this way.
- Clusters of small soft insects on the shoot tips and buds: aphids RHS
Why: Aphids cluster on soft new growth and flower buds, where the sap is easiest to reach.
What to try:
- Rub them off with fingers, or rinse them off in a sink or shower.
- Repeat every few days while new ones appear.
What would settle it: Look for the pale shed skins among the insects. Aphids molt as they grow, and the skins are left behind in the colony.
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 carnation 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 carnation 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 Carnation, still possible
Questions
- What usually causes pests on a Carnation?
- For Carnation: aphids, spider mites and mealybugs.
- How can I tell which one it is on my Carnation?
- 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 Carnation's sources say about its pests and diseases?
- RHS: Aphids and slugs can attack it. Disease risks: Fusarium wilt, a virus, a rust and powdery mildews.
- What does this look like on a Carnation?
- The youngest growth of the carnation 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 Carnation 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
African violetIrregular notches bitten from leaf edges by an insect pest
Barberton daisyCurled, sticky new leaves with green or black insects: aphids
Bearded irisRagged holes and slime trails: a slug or snail pest
Bigleaf hydrangeaClusters of small soft insects on the shoot tips and buds: aphids
Bird of paradiseDull, finely mottled leaves and faint webs: spider mites
Blue passion flowerPale stippled leaves and tiny moving dots underneath: a mite pest
Something else wrong with the Carnation?
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.