Ronna, E. 1934a Pragas e molestias das plantas herbaceas: defesa sanitaria. [Pests and diseases of herbaceous plants: sanitary protection.]. Boletim (Escola de Agronomia "Eliseu Magiel", Pelotas, Rio Grande do Sul, Brazil) No. 14.

Notes: Orthezia and Margarodes spp. mentioned, among others.