Boxwood psyllid
5 host plants
On boxwood foliage you will see cupped or sagging leaves beginning in late spring, with tiny whitish insects visible on undersides and small white flocculent material (waxy coating) covering them. Heavy infestations cause stunted or distorted new growth and plant decline. Look for this pest on boxwood species during May and June.
Prune out cupped or severely distorted new growth in spring to remove overwintering nymphs before maturity. Apply horticultural oil in late March or early April, coating thoroughly to target dormant nymphs. If new infestations appear in late May, apply insecticidal soap to new growth when nymphs active. Some cultivars show natural resistance.