What Do Scale Insects Do

Scale insects feed by sucking sap from trees and shrubs through piercing-sucking mouth parts. Sap feeding by scale insects may cause yellowing or wilting of leaves, stunting or unthrifty appearance of the plants, and eventually death of all or part of the plant when infestations are heavy.

Are scale insects bad?

This is a pretty bad infestation of sap sucking insects called Scale. We haven’t ID’d to species, but they are damaging the plant and will cause black sooty mold to grow. The insects excrete a sugary, sticky excrement called honeydew that is a perfect “food” for the sooty mold fungus to grow in.

What causes scale insects on plants?

As scale insects feed on the sap of a plant, they excrete tiny droplets of a sugary liquid called honeydew. The droplets of honeydew fall and accumulate on foliage below, which can cause that foliage to look shiny and feel sticky. … Ants, wasps and other insects may be attracted to the sweet honeydew.