Nakano, O., Parra, J.R.P., & Pereira, A.R. 1975 Efeitos climáticos na ocorrência de Orthezia insignis Browne, 1887 em cafezais do Paraná. [Climatic effects on the occurrence of Orthezia insignis Browne, 1887 (Homoptera - Ortheziidae) as coffee pest plantations in Parana state.]. Bragantia 34: I-III.
Notes: The peculiarity of this occurrence was that it disappeared much later without any insecticide control. This research tries to explain this phenomenon by comparing climatological records with the needs of this pest.