Cassino, P.C.R., & Gonçalves, M.L. 1976 The occurrence of Orthezia preaelonga Douglas on citrus plants in the municipality of Vassouras (preliminary note).. Agronomia, Brazil 31: 5-8.

Notes: O. praelonga developed about 600 meters above sea level, withstood low winter temperature (3°C) and spread to all parts of the tree.