Camellia 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 Camellia (Camellia japonica), using what its sources say about pests and diseases, humidity and watering and 2 problems recorded for it.
Sources last read 14 September 2026.
Camellia japonica, known as common camellia, or Japanese camellia, is a species of flowering plant from the genus Camellia in the tea family Theaceae. It is native to China and Japan, and grows naturally in forests at altitudes of around 300–1,100 metres (980–3,600 ft). Wikipedia, CC BY-SA 4.0
Native range: China (Shandong, E. Zhejiang), Korea (Jejudo), C. & S. Japan to Taiwan (subtropical). Also sold as Common Camellia, Japanese Camellia, Japanese rose, Peony Camellia and rose camellia.
What Camellia’s sources say that bears on this
- Pests and diseases
- Can be troubled by cottony camellia scale, other camellia pests, peony scale, bifasciculate scale, walnut scale, Indian wax scale and camellia scale.NC State Extension · read 13 September 2026Can be troubled by vine weevil, scale insects and aphids. Diseases: camellia leaf blight, camellia petal blight on flowers, Camellia gall, Camellia yellow mottle virus, Phytophthora root rot 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
- Watering
- Plants are slow to establish, so dig a big hole three to four times as wide as the root ball, but no deeper, so nearby trees and shrubs compete less for nutrients and water. Some flower bud drop can be natural, but overwatering or underwatering can also cause it.NC State Extension · read 13 September 2026
How this shows up on a Camellia
Small raised bumps along the stems and veins, with sticky leaves: scale insects
Rows of small, hard scales sit where the veins of the camellia are thickest, and the surface below them is glossy with honeydew.
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: Stickiness below the bumps. Scale drips honeydew; a leaf spot is dry.
RHS · read 13 September 2026Sticky buds and shoot tips crowded with small insects
Aphids gather on the undersides of new leaves and around buds on the camellia, leaving honeydew and shed skins behind.
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 2026Possible causes, likeliest first for a Camellia
Most likely scale insects
Ranked higher because Camellia'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 camellia 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 camellia does not move.
Most likely aphids
Ranked higher because Camellia's recorded problems point this way.
- Sticky buds and shoot tips crowded with small insects 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 camellia 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 Camellia, still possible
Questions
- What usually causes pests on a Camellia?
- For Camellia: scale insects, aphids and spider mites.
- How can I tell which one it is on my Camellia?
- 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 Camellia's sources say about its pests and diseases?
- NC State Extension: Can be troubled by cottony camellia scale, other camellia pests, peony scale, bifasciculate scale, walnut scale, Indian wax scale and camellia scale. RHS: Can be troubled by vine weevil, scale insects and aphids. Diseases: camellia leaf blight, camellia petal blight on flowers, Camellia gall, Camellia yellow mottle virus, Phytophthora root rot and, rarely, honey fungus.
- What does this look like on a Camellia?
- Rows of small, hard scales sit where the veins of the camellia are thickest, and the surface below them is glossy with honeydew. Telling it apart: Stickiness below the bumps. Scale drips honeydew; a leaf spot is dry.
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 Camellia?
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.