Goethe, R. 1897 Die kleine runde Schildlaus auf Birn- und Apfelbäumen (Diaspis ostreaeformis Curtis). [The small round scale insect on pear and apple trees (Diaspis ostreaeformis Curtis).].. Berichte Lehranstalt Gefsenheim 66-74.

Notes: Brief description, biology, natural enemies and chemical control are discussed. Detailed illustrations are provided. Aspidiotus perniciosus is also mentioned as vulnerable to petroleum emulsion.