Watzl, O. 1934 Beobachtungen über den Lebenslauf der San José-Schildlaus in Mitteleuropa. [Observations on the San José scale insect in central Europe.]. Die Landeskultur No. 3: 64-66.

Notes: Detailed description, distribution, occurence compared in different regions in Austria, life cycle, biology and host plant information is given.