Scale Insects
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About this condition
Shell-like insects that attach to stems and leaves and feed by sucking plant sap. Their honeydew secretions can trigger sooty mold, causing both aesthetic damage and plant weakening.
Common symptoms
- Brown, white, or gray shell-like bumps may be found fixed to stems and leaves
- Leaves and stems may feel sticky to the touch from honeydew secretions
- A black sooty coating (sooty mold) may appear on leaf surfaces
- Leaves may yellow and fall, and the plant may gradually weaken
Common causes
- Introduction of adults or crawlers on newly purchased plants or soil
- Proliferation in poorly ventilated indoor environments
- Crowded planting with no natural predators present
- Late detection due to infrequent inspection of stems and leaf undersides
Prevention (growing conditions & routine care)
Regularly inspect stems and leaf undersides for early detection. Newly purchased plants should be quarantined before placing them near others. Avoid crowding and ensure good airflow around plants.
Related guide
→ Browse the species guide for this animalWhen to see a vet
Consider acting within a few daysWhat can a nursery or grower do?
Specialist nurseries and growers can help identify the scale species, assess the severity of infestation, and advise on corrective environmental measures such as reducing plant density and improving air circulation.
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Other problems with this plant
Root RotAct promptly (isolate, remove the cause)Spider MitesConsider acting within a few daysMealybugsConsider acting within a few daysLeaf ScorchMonitor; consult a specialist if it worsensPowdery MildewConsider acting within a few daysAnthracnoseConsider acting within a few daysCold Damage / Chilling InjuryConsider acting within a few days