WSU Extension


Magnesium deficiency 
Pear trellis rust 
Phomopsis twig blight 
Phytophthora root rot 
Cypress tip moth 
Juniper scale 
Juniper tip midge 
Juniper webworm 
Spruce spider mite 

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Caption: Juniper cypress tip moth
Photo by: A.L. Antonelli
Juniper : Leafminers
(revision date: 6/19/2015)

Various species of leafminers may occur on junipers. In general, the damage they produce is very similar to that of the cypress tip moth. Damage is typically limited to tips of twigs, which are fed upon from the inside. Damaged leaves and twigs turn brown and webbing and dark pellets of frass (excrement) may be visible. Heavy infestations can cause severe damage.
Management Options

Non-Chemical Management
  • Several naturally-occurring parasites help control leafminer populations. Try to avoid use of broad-spectrum insecticides to conserve the parasites.
  • Remove damaged portions of plant to improve appearance (when practical).
Select non-chemical management options as your first choice!

Chemical Management

Apply thoroughly to new growth as a protective spray. Apply at end of May and again in mid-June. Follow label instructions for products applied as a drench. Homeowners should not make foliar applications to trees over 10 ft tall. Consult a commercial pesticide applicator for treatment of trees and shrubs over 10 ft. tall.

Listed below are examples of pesticides that are legal in Washington. Always read and follow all label directions.
  • Bonide Systemic Insect Control
    Active ingredient: acephate  |  EPA reg no: 239-2461-4
  • This list may not include all products registered for this use.

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Caption: Juniper cypress tip moth
Photo by: A.L. Antonelli
Caption: Arborvitae cypress tip moth damage
Photo by: R.S. Byther
Caption: Arborvitae cypress tip moth damage
Photo by: A.L. Antonelli