What's eating my euphorbia schoenlandii?

Euphorbia schoenlandii is a rare, clustering succulent where mealybugs are the most likely indoor pest, sheltering in the joints between the clustered heads. Root mealybugs pose a risk if overwatered. Spider mites can occur in dry conditions. Inspect the crown and base carefully during seasonal repotting.

White cottony deposits at cluster joints and around growing tips; sticky honeydew may accumulate on lower offsets. Dab individual colonies with alcohol on a cotton swab; apply neem oil spray to the entire plant cluster and repeat in 10 days.

Stunted new growth and loose, unthrifty appearance; white waxy powder visible at root zone when unpotted. Unpot, rinse roots, treat with neem drench, dry for several days, then replant in fresh cactus mix.

Pale speckling and webbing on stem surfaces, most visible in bright light; occurs mainly in low-humidity winter conditions. Improve humidity and apply insecticidal soap spray; repeat weekly for three to four treatments.