Oystershell Scale

By The Old House Web

Oystershell Scale

List of files and visuals associated with this text.

This scale overwinters as an egg. The eggs hatch during a two week period in late May and the crawlers move to other parts of the plant.

The scales are gray with brown stripes or mainly gray. The insects suck sap from the tree. A heavy infestation will weaken the plant and heavily infested plants may drop leaves. The insects are not obvious and can build up to large numbers on trunks and twigs before being noticed.

Overwinter stages are controlled with dormant oil spray. Crawlers are controlled with Orthene, Sevin, Diazinon or malathion.

Visuals associated with this text.

Visual title - Visual size Visual title - Visual size
Oystershell scale on pine - 25K Oystershell scale - 25K
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