What's eating my balearic box?

Balearic box is one of the larger Buxus species and is fully susceptible to box tree moth caterpillars — research confirms equal vulnerability to B. sempervirens. Boxwood leafminer and psyllid also attack it. Its larger leaf size makes leafminer blistering especially visible. The same integrated management approach applies as for other Buxus.

Caterpillars rapidly destroy foliage — windowing, then full skeletonization — with diagnostic webbing inside the plant canopy. Confirmed equally susceptible to box tree moth as European common box. Monitor with pheromone traps from spring. Remove caterpillars by hand or apply spinosad or pyrethrin-based sprays, repeating every 2–3 weeks. Multiple generations per year in warm climates demand sustained vigilance.

Larvae mine between leaf surfaces, causing pronounced blister-like, pale or orange-yellow patches. Larger Balearic box leaves make the blistering easier to spot than on smaller-leaved species. Apply a systemic imidacloprid drench in spring. Prune and dispose of heavily mined shoots. Foliar bifenthrin or malathion timed to adult fly emergence (May–June) also effective.

Nymphal feeding causes distorted, cupped shoot tips with waxy white secretions. Mostly cosmetic but disfigures the plant's formal appearance. Remove cupped shoot tips after adults leave in late spring. Spray nymphs with insecticidal soap or pyrethroid in early spring if infestation is heavy.