Answer: If it's long and looks puffy like styrofoam, it's probably Tent Caterpillar. If it's round or oval, it might be Oystershell Scale. Tent Caterpillars lay egg masses and cover them with a protective layer that's well cemented down. Scale insects attach themselves to a host and remain in place until they die. The females protect their offspring under their shell and when they're mature enough to feed on their own, they march up and down the limb, fence rail or trunk, looking for a likely place to attach themselves. Adult scales can be squished in place or picked off. They can also be suffocated with an application of horticultural oil (generally sprayed in late winter on dormant trees and shrubs). The Tent Caterpillar egg masses can be picked off and destroyed. Hope we've identified the problem for you!
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