The Florida red scale Chrysomphalus aonidum and date palm scale Parlatoria blanchardii (Hemiptera Diaspididae) are considered as a sever insect pests on the  ornamental plants in different gardens in Egypt. This work aimed to study the biology of these pests on their host plants; Madagascar dragon tree Dracaena tricolor and Butchers broom Ruscus aculeatus under different temperatures (22, 25, 27 and 30°C). The obtained results showed that increase in temperature reduced the developmental time for all stages of both species. The duration of C. aonedium female nymphs at 22, 25, 27, 30 ºC ranged between 33.8±3.3 days at 30ºC and 36.5±4.5 days at 22 ºC. The total male nymph's duration periods were 46.2±7.6, 42.6±3.0, 42.0 ±6.5 and 39.1±4.1 days at 22, 25, 27 and 30oC, respectively. The adult female lived for 18.2±2.5, 17.3±1.9, 15.9±2.8, and 15.5±2.5 days at 22, 25, 27 and 30ºC respectively. While the duration of female nymphs' stage of P. blanchardii were 39.5±2.8, 27.9±2.3, 27.3±1.9and 25.5±2.4 days at 22, 25, 27 and 30°C respectively. The longest of developmental time of male nymphs (24.2±2.7 days) which was recorded at 22°C while the shortest one was 19.8±3.6 days, which obtained at 30°C. The adult female longevity was 48.6±2.8, 47.7±3.4, 46.7±5.1, and 45.0±3.2 days at 22, 25, 27 and 30ºC respectively.