How to Manage Pests

Pests in Gardens and Landscapes

Monterey cypress scale—Xylococculus macrocarpae; Cypress bark mealybug or cypress
bark scale—Ehrhornia cupressi

The Monterey cypress scale or incense cedar scale occurs on Monterey cypress and incense cedar. Scales are very small and immobile. They occur on bark beneath wax. Cypress bark mealybug (pictured) resembles the preadult females of Monterey cypress scale. Nymphs and adults are round, bright red or orange, and surrounded by a ring of white wax. Both species occur on bark of incense cedar and Monterey cypress, and they look similar during certain life stages.

Damage

Leaves infested by the Monterey cypress scale become yellow and young trees decline. White waxy threads appear on bark. Foliage infested by the cypress bark mealybug becomes yellow and red and eventually may die.

Solutions

Only heavily infested or young trees may be harmed. If scales are abundant and damage cannot be tolerated, apply horticultural oil to the bark.

Cypress bark mealybug adult
Cypress bark mealybug adults

Cypress bark mealybug damage
Cypress bark mealybug damage


Statewide IPM Program, Agriculture and Natural Resources, University of California
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