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: R.S. Byther
Juniper : Cypress tip moth
(revision date: 3/22/2021)

The adult cypress tip moth (cypress tip miner) is a silver-tan moth approximately 1/4" in length. The larvae are green, about 1/8" long, and tunnel in the leaves and growing shoot tips. Damage is typically limited to tips of twigs. In late winter, damaged leaves begin to turn brown. The larva exits the mined areas in late winter or early spring to make a cocoon. The exit holes are dark and may resemble symptoms of leaf blight, a fungal disease. The cocoon is a white, somewhat papery structure made in the dead or living foliage. The adult moths appear on plants around May-June. Heavy infestations can cause severe damage.
Management Options

Non-Chemical Management
  • Use resistant plants. The following are reported to be least susceptible to damage: Juniperus chinensis var. sargentii cv. Glauca, J. chinensis cv. Kaizuka, J. scopulorum cv. Erecta Glauca, and Thuja plicata.
Select non-chemical management options as your first choice!

Chemical Management

Apply in late spring to early summer. In western Washington, this is usually around late June. 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.
  • Bayer Advanced Vegetable & Garden Insect Spray RTS
    Active ingredient: cyfluthrin  |  EPA reg no: 72155-39
  • Bonide Captain Jack's Deadbug Brew RTSpray [Organic]
    Active ingredient: spinosad (spinosyn A+D)  |  EPA reg no: 4-471
  • Safer Brand Caterpillar Killer/Trees, Shrubs, & Vegetables Conc
    Active ingredient: Bacillus thuringiensis subsp. kurstaki  |  EPA reg no: 42697-23
  • This list may not include all products registered for this use.

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