Pest identification
What's eating my euphorbia cooperi?
Scale insects
Signs: Clusters of brown or tan bumps on the angular ridges and branch joints; sap loss causes yellowing patches.
Control: Scrape off with a toothbrush dipped in insecticidal soap; apply horticultural oil; repeat every two weeks.
Mealybugs
Signs: White cottony deposits in rib channels and near growth tips; honeydew and slow, distorted growth.
Control: Dab colonies with isopropyl alcohol on a cotton swab; follow up with a neem oil spray; repeat weekly.
Spider mites
Signs: Fine pale stippling across stem surfaces; delicate webbing visible in hot, dry indoor air.
Control: Increase humidity, rinse plant surfaces, apply miticide or neem oil, and repeat treatment every 7–10 days.
Keep euphorbia cooperi pest-free
Healthy plants resist pests best. Get the basics right:
Euphorbia cooperi pests — FAQ
What is eating my euphorbia cooperi?
Euphorbia cooperi, a large candelabra-form African Euphorbia grown as a statement houseplant, is most commonly attacked by scale insects on its thick angular stems and by mealybugs in the rib grooves. Spider mites also occur in dry conditions. Its highly toxic latex is a strong deterrent to chewing insects and mammals.
How do I get rid of scale insects on euphorbia cooperi?
Clusters of brown or tan bumps on the angular ridges and branch joints; sap loss causes yellowing patches. Scrape off with a toothbrush dipped in insecticidal soap; apply horticultural oil; repeat every two weeks.
How do I get rid of mealybugs on euphorbia cooperi?
White cottony deposits in rib channels and near growth tips; honeydew and slow, distorted growth. Dab colonies with isopropyl alcohol on a cotton swab; follow up with a neem oil spray; repeat weekly.
How do I get rid of spider mites on euphorbia cooperi?
Fine pale stippling across stem surfaces; delicate webbing visible in hot, dry indoor air. Increase humidity, rinse plant surfaces, apply miticide or neem oil, and repeat treatment every 7–10 days.