Pest identification
What's eating my pencil cactus (firestick)?
Mealybugs
Signs: White cottony clusters at branch forks; sticky honeydew and sooty mould
Control: Apply 70% isopropyl alcohol with a cotton swab at all forks; wear gloves to protect from sap
Spider mites
Signs: Fine webbing on pencil-thin stems; pale, dull green colouration; leaf tips yellowing
Control: Rinse with lukewarm water; apply neem oil or insecticidal soap; raise humidity
Scale insects
Signs: Hard tan bumps on older woody stems; sticky deposit below the colony
Control: Scrub off with a brush dipped in rubbing alcohol; follow with horticultural oil spray
Keep pencil cactus (firestick) pest-free
Healthy plants resist pests best. Get the basics right:
Pencil Cactus (Firestick) pests — FAQ
What is eating my pencil cactus (firestick)?
Pencil Cactus (Euphorbia tirucalli) is targeted mainly by mealybugs and spider mites indoors. Its toxic milky latex deters many pests, making infestations less frequent than on true cacti. Spider mites thrive in dry winter air. Scale occasionally appears on woody stems. Always wear gloves when treating — the sap causes skin and eye irritation.
How do I get rid of mealybugs on pencil cactus (firestick)?
White cottony clusters at branch forks; sticky honeydew and sooty mould Apply 70% isopropyl alcohol with a cotton swab at all forks; wear gloves to protect from sap
How do I get rid of spider mites on pencil cactus (firestick)?
Fine webbing on pencil-thin stems; pale, dull green colouration; leaf tips yellowing Rinse with lukewarm water; apply neem oil or insecticidal soap; raise humidity
How do I get rid of scale insects on pencil cactus (firestick)?
Hard tan bumps on older woody stems; sticky deposit below the colony Scrub off with a brush dipped in rubbing alcohol; follow with horticultural oil spray