Chlorosis of the leaves resulting in silvering or bronzing. High infestations may cause defoliation, branch dieback, and in extreme cases canopy thinning and tree mortality (Jacobs & Neser 2005).

Thaumastocoris peregrinus has multiple generations per year. Eggs are laid on the leaf surface, often in clusters. There are five nymphal instars. Adults can live up to 40 days and females produce approx. 60 eggs.

An egg parasitoid wasp, Cleruchoides noackae (Mymaridae) has been released as a biological control agent, with the first releases in 2013.