Arborvitae Archives
Insects and diseases that can affect Arborvitae (Thuja).
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Bagworms
Bagworm is a caterpillar that molts into a moth in the adult stage. They are easiest to identify by the bags they construct as they feed. Damage includes needle discoloration and injury.
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Bark Beetle
Bark beetles, family Scolytidae, are common pests of conifers (such as pines, Arborvitae, Fir, Juniper, Leyland Cypress) and some attack broadleaf trees. Over 600 species occurring the United States and Canada with approximately 200 in California alone. The most common species infesting pines in urban landscapes
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Fletcher Scale
The Fletcher Scale, sometimes referred to as the arborvitae soft scale, is a common pest of arborvitae and yew.
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Japanese Cedar Longhorn Beetle
The Japanese cedar longhorned beetle is an exotic insect that bores into trees of the cypress family.
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Kabatina and Phomopsis Twig Blight
The disease is most severe in nursery stock and seedlings where plants are grown closely together.
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Pestalotiopsis
Pestalotiopsis is a type of needle blight fungal disease that is primarily found on arborvitae (Thuja). It is usually considered a secondary disease that attacks foliage that has been injured or weakened by unfavorable weather or growing conditions. The disease may kill the smaller twigs where the infected needles died
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Spruce Spider Mite
The Spruce Spider Mite is considered one of the most destructive spider mites in the United States.