Arborvitae Leafminer


They can cause damage by tunneling in the tips of foliage causing them to turn yellow then brown. The yellowing appears in late summer and worsens by next spring. Damage is usually most severe on southern sun exposure side of plants. Mature caterpillars are 1/4 inch long, green with a reddish tinge and black heads. The adults are 1/3 inch long, light tan moths.