Utah State University Extension
Oystershell scale is a common pest of ash aspen maple lilac cottonwood and willow in Utah but it may infest over. Small gray or brown scales shaped like oyster shells are present as bumps on branches and twigs. . Oystershell scale blends in well with tree bark and often goes unnoticed until symptoms appear on their host UPPDL. Branch dieback can occur with heavy infestations..
Remove heavily infested branches and twigs This not only reduces the number of scales but. Oystershell scale are a type of armored scale. Natural enemies of oystershell scales may provide some degree of control. Hard scales are most easily controlled using systemic insecticides containing dinotefuran..
Oystershell scales overwinter as white eggs beneath the female cover Late May or early June the eggs hatch and tiny. Unlike most insects adult oystershell scales do not have legs eyes or antennae. Adult oystershell scales are enclosed in a shell made up of its own shed skins..
Oystershell scale is a common pest of. ..
Utah State University Extension
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