Abstract The date palm is the main agricultural base in the southern region of the Saharan Atlas, Algeria and especially at Biskra , Algeria .This crop is threatened by insect pests, such as the white date palm scale Parlatoria blanchardi (Targioni-Tozzetti, 1868) (Hemiptera?Diaspididae). This devastating pest causes premature dryness of the date palm trees, and leads to total loss of the palm. During this study, the white date palm scale completes four cycles or four generations per year. The first generation occurs in early summer during the two study seasons, 2017 and 2018. The second generation is mentioned in mid-July in 2017 and mid-August in 2018. The third generation appears at the end of September in 2018 and mid-October,2018. The fourth generation is mentioned at the end of December in 2017 and mid-January in 2018. Keywords Date palm, Biskra, oasis, date scale, population , dynamic, temperature, humidity

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