Pest identification
What's eating my melocactus peruvianus?
Mealybugs
Signs: White woolly masses in or around the cephalium; disruption to flower and seed production
Control: Spot-treat with alcohol swabs around the cephalium edge; apply soil-drench systemic insecticide; avoid wetting the wool
Scale insects
Signs: Crusty brown bumps along the ribs and at spine bases on the main body
Control: Remove physically with a toothpick or alcohol-brushed cotton; follow up with neem oil on the cactus body
Root mealybugs
Signs: Weakening of the cactus despite good care; white deposits at roots when unpotted
Control: Treat root zone with dilute imidacloprid; repot annually in fresh, well-drained cactus mix
Keep melocactus peruvianus pest-free
Healthy plants resist pests best. Get the basics right:
Melocactus peruvianus pests — FAQ
What is eating my melocactus peruvianus?
Melocactus peruvianus, the Peruvian melon cactus, is most seriously damaged by mealybugs colonising its cephalium, which can halt flower and fruit production entirely. Scale insects and spider mites also affect the cactus body. The cephalium must be kept dry during any treatment to avoid rot.
How do I get rid of mealybugs on melocactus peruvianus?
White woolly masses in or around the cephalium; disruption to flower and seed production Spot-treat with alcohol swabs around the cephalium edge; apply soil-drench systemic insecticide; avoid wetting the wool
How do I get rid of scale insects on melocactus peruvianus?
Crusty brown bumps along the ribs and at spine bases on the main body Remove physically with a toothpick or alcohol-brushed cotton; follow up with neem oil on the cactus body
How do I get rid of root mealybugs on melocactus peruvianus?
Weakening of the cactus despite good care; white deposits at roots when unpotted Treat root zone with dilute imidacloprid; repot annually in fresh, well-drained cactus mix