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 (Laudonia & Sasso 2012, Ide et al. 2011, Wilcken et al. 2010).
Adult T. peregrinus are small; 2 to 3mm in length. Their bodies are flattened and light brown with darker brown patches. The antennae have darker tips and their mandibular plates are long, broad and curved on the outer margin (Carpintero & Dellapé 2006, Noack et al 2011, Laudonia & Sasso 2012).
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.