Wood Acres Tree Specialists MD, DC, VA
call for tree service-1-888-464-3926
10315 Kensington Parkway, Kensington MD 20895-3358
Leaf Notes Blog
Tree & shrub care services
General Tree Work:
Plant Health Care:

Aborvitae Leafminer

John A. Weidhass, Virginia Polytechnic Institute and State University, Bugwood.org

Argyresthia thuiella (Packard) - Larva(e)The adult moths are small (wingspan 5-6mm), silvery tan in appearance, and are active starting approximately mid-June into early July. Eggs are laid on the foliage, from which the larvae soon hatch, and then they chew their way into the leaves. These entrance holes are only noticeable under magnification. Larvae will feed within the foliage until autumn, whereupon they will over-winter within these mines. Feeding will resume in the spring and pupation will begin by late May. Browning of the foliage from all arborvitae leafminer species feeding activity will not appear until late January or February and is therefore often misdiagnosed as being winter injury.

Browned foliage tips that are hollow, contain frass (the dried, brown pellets of the caterpillar’s excrement), and perhaps a living larva are the key telltale signs of leafminer presence. On the other hand, if the brown tips are not hollow, then the cause is due to winter injury, disease or some other factor.

Pro-active tree & shrub care
Insect & Tree Pest Index Tree & Shrub Disease Index Tree & Shrub Damage Index Monthly Plant Health Care Report
Tree & Shrub Care info
Affiliations
Maryland Aborist Association   Tree Care Association Accreditation   ISA Certified Master Arborist ISA Certified Arborist
Maryland Arborist
Association
Tree Care Industry
Association
International Society
of Arboriculture
Master Arboist
On Staff
Copyright © 2010-2017 Wood Acres Tree Specialists - All Rights Reserved