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.
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|Oystershell scale on pine - 25K||Oystershell scale - 25K|