Boxwood Leafminer and Psyllid: Confirmation and Systemic Control

Boxwood Leafminer and Psyllid: Confirmation and Systemic Control

Tan, brown leaves with no larvae inside indicate leafminers have completed their generation and emerged. Cupped leaves suggest psyllid damage. Both pests weaken boxwoods but rarely kill them.

Action Plan

1. Confirm diagnosis with your Extension office or nursery using fresh samples.
2. Prune out and destroy heavily damaged foliage to reduce next year's population.
3. Apply imidacloprid (Bayer Tree & Shrub) as a soil drench in early spring for systemic control of both pests.
4. Monitor for psyllid nymphs on new growth; spray with insecticidal soap if needed.

Healthy, well-fertilized boxwoods tolerate light infestations with minimal aesthetic impact.