Pest identification
What's eating my pachycereus schottii?
Mealybugs
Signs: White waxy clusters concentrated around the bristly apex hairs and areoles; honeydew attracts sooty mould; plant growth slows
Control: Remove with alcohol-dipped cotton buds; spray entire plant with diluted neem oil every 7–10 days; isolate from other cacti
Scale insects (soft and armoured)
Signs: Flat or rounded bumps on ribs and stem skin; feeding depletes sap and leaves yellow halos; heavy infestations cause stem cracking
Control: Scrub scales off with a soft toothbrush and soap solution; apply horticultural oil; systemic insecticide for heavy infestations
Spider mites
Signs: Pale, dry stippling on the green stem skin; fine webbing at areoles; worse in low-humidity indoor environments in summer
Control: Increase humidity slightly around the plant; spray with insecticidal soap; move away from heat sources or radiators
Keep pachycereus schottii pest-free
Healthy plants resist pests best. Get the basics right:
Pachycereus schottii pests — FAQ
What is eating my pachycereus schottii?
Pachycereus schottii (senita cactus) as a houseplant is most frequently troubled by mealybugs tucking into its woolly spine clusters near the apex. Scale insects can crust the ribs, and spider mites attack during hot, dry indoor spells. Root mealybugs are a risk in poorly draining compost.
How do I get rid of mealybugs on pachycereus schottii?
White waxy clusters concentrated around the bristly apex hairs and areoles; honeydew attracts sooty mould; plant growth slows Remove with alcohol-dipped cotton buds; spray entire plant with diluted neem oil every 7–10 days; isolate from other cacti
How do I get rid of scale insects (soft and armoured) on pachycereus schottii?
Flat or rounded bumps on ribs and stem skin; feeding depletes sap and leaves yellow halos; heavy infestations cause stem cracking Scrub scales off with a soft toothbrush and soap solution; apply horticultural oil; systemic insecticide for heavy infestations
How do I get rid of spider mites on pachycereus schottii?
Pale, dry stippling on the green stem skin; fine webbing at areoles; worse in low-humidity indoor environments in summer Increase humidity slightly around the plant; spray with insecticidal soap; move away from heat sources or radiators