Pest identification
What's eating my senita cactus?
Mealybugs
Signs: White woolly masses among bristle-spines at stem tips; slow growth; sticky honeydew dripping onto lower foliage
Control: Remove manually with alcohol-dipped cotton swabs; spray the entire plant with neem oil emulsion; isolate from other cacti during treatment
Scale insects
Signs: Hard tan or brown discs attached to ribs and areoles; yellowing around attachment points; honey-like residue
Control: Dislodge with a soft brush dipped in soapy water; follow with horticultural oil spray; re-inspect after two weeks
Spider mites
Signs: Pale bronzing or russet mottling on stem skin; dusty webbing across spines in low-humidity settings
Control: Rinse plant thoroughly, increase ambient humidity marginally; treat with insecticidal soap or a dilute neem oil spray twice, seven days apart
Keep senita cactus pest-free
Healthy plants resist pests best. Get the basics right:
Senita Cactus pests — FAQ
What is eating my senita cactus?
Senita Cactus (Lophocereus schottii) kept indoors is most commonly attacked by mealybugs hiding in the dense grey bristle-spines at the stem tips. Scale insects and spider mites also appear in dry conditions. The bristly cephalium zones require close inspection as pests are easily concealed.
How do I get rid of mealybugs on senita cactus?
White woolly masses among bristle-spines at stem tips; slow growth; sticky honeydew dripping onto lower foliage Remove manually with alcohol-dipped cotton swabs; spray the entire plant with neem oil emulsion; isolate from other cacti during treatment
How do I get rid of scale insects on senita cactus?
Hard tan or brown discs attached to ribs and areoles; yellowing around attachment points; honey-like residue Dislodge with a soft brush dipped in soapy water; follow with horticultural oil spray; re-inspect after two weeks
How do I get rid of spider mites on senita cactus?
Pale bronzing or russet mottling on stem skin; dusty webbing across spines in low-humidity settings Rinse plant thoroughly, increase ambient humidity marginally; treat with insecticidal soap or a dilute neem oil spray twice, seven days apart