- Oetting 1984
- Biology of the cactus scale, Diaspis echinocacti (Bouché). Annals of the Entomological Society of America 77: 88-92.
- Ofek 1997
- The control of the oriental red scale, Aonidiella orientalis Newstead and the California red scale, A. aurantii (Maskell) (Homoptera: Diaspididae) in mango orchards in Hevel Habsor (Israel). Alon Hanotea 51: 212-218.
- Ohgushi, Nishino 1968
- Preliminary report on the forecasting of the arrowhead scale appearance on the basis of the seasonal thermal index. Proceedings of the Association for Plant Protection of Kyushu 14: 42-43.
- Ohkubo 1980
- Ecology and control of the arrowhead scale, Unaspis yanonensis Kuwana. Review of Plant Protection Research 13: 1-11.
- Onder 1982
- Investigations on the biology, food-plants, damage and factors affecting seasonal population fluctuations of Aonidiella species (Homoptera: Diaspididae) injurious to citrus trees in Izmir and its surroundings. Arastirma Eserleri Serisi No. 43: 1-171.
- Ossiannilsson 1992
- The Psylloidea (Homoptera) of Fennoscandia and Denmark. Fauna Entomologica Scandanavica 26: 1-346.
- Ouvrard 2000
- 18S RNA secondary structure and phylogenetic position of Peloriidae (Insecta, Hemiptera). Molecular Phylogenetics and Evolution 16 (3): 403-417.
- Ozawa 1994
- The occurrence of white peach scale, Pseudaulacaspis pentagona (Targioni), in tea fields and its chemical control. III. Effect of various pesticides in the control of the scale. Proceedings of the Kanto-Tosan Plant Protection Society No. 41: 257-259.