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IPM Scouting in Woody Landscape Plants

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Juniper scale - Carulaspis juniperi
IPM scouting in woody landscape plants > juniper scale
Hosts: Juniper, arborvitae and chamaecyparis. An infestation of this armored scale causes off-color foli-age, yellowing and dieback of juniper needles. Severely infested junipers may have little to no new growth. Female scales overwinter as adults with eggs; there is one generation per year. Look for crawler emergence beginning early to mid-June, around the time Washington hawthorn or Japanese tree lilac is in bloom.

Management: Several parasitic wasps are among the natural enemies of juniper scale. The overwintering adult female is vulnerable; otherwise the crawler stage should be targeted for treatment with insecticides.
Juniper scale Juniper scale
Juniper scale. Male scales are elongate; females are round and 1.5 mm in diameter.
Additional information
This information was developed from A Pocket IPM Scouting Guide for Woody Landscape Plants by Diane Brown-Rytlewski. Purchase this in a pocket-sized guide for reference in the orchard from MSU Extension (publication E-2839).
The MSU IPM Program maintains this site as an access point to pest management information at MSU. The IPM Program is administered within the Department of Entomology, fueled by research from the Michigan Agricultural Experiment Station, delivered to citizens through MSU Extension, and proud to be a part of Project GREEEN.
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Updated 7/09/07