The author collected the records of food plants of the horned scale, Ceroplastes pseudoceriferus Green and arranged them. The food plants of this scale amounted to 45 families, 110 species in Japan, including 62 species observed by the author. Rosaceae was ranked first in number of species and Theaceae was the second. For the purpose of mass culture of this scale preliminary study was undertaken by using the sprouts of potato (Solanum tuberosum L.) and the squash (Cucurbita moschata Duch. var. melonaeformis Makino) as host-supporting media in June, 1961. The crawlers of this scale were collected by a 'Shadow-light' box which was developed by Yasumatsu and transferred on the surface of the potato sprouts and squashes. A few scales matured on the potato sprouts and deposited on them in May, 1962, but none on the squashes. The potato sprouts and squashes seemed to be quite unsuitable host-supporting media for this scale. As reported by Kato (1962) the superiority of Erigeron canadensis L. Himemukashiyomogi) and Solidago Virga-aurea L. (Akinokirinso) as host-supporting media for this scale was ascertained.