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Aphid-like insects of the family Adelgidae that are found exclusively on conifers. They feed on the sap of the host tree and cause cone-like growths, which can stunt or kill twigs and, in severe infestations, disfigure ornamental trees.

Froth, resembling spit, produced by the larvae of froghopper insects, to provide them with thermal and moisture control, and to hide them from predators. The larvae suck sap from the plant, but generally do little harm.

the ground, trapping the insects before they can do any damage.