Given the worldwide importance of the of Deglet Nour variety, our study was set up to assess the impact of the bagging dates bunches and the cleaning of date palms against Ectomyelois ceratoniae Zeller, in this variety. Two phoenicicoles regions and three phonologic stages of the dates were considered during two crop campaigns 2013/2014 and 2014/2015. The infestation rates were estimated on: the dates of palm trees which underwent the cleaning and / or the bagging bunch by the polyethylen at once compared to a witness. A progressive temporary evolution of the infestation rates of dates was noted, from the stage Routab (early stage of maturation) up to the stage Tmar (stage of maturity of dates). In the region of Biskra, a low average rates of infestation were recorded to dates bagged of the cleaned palm trees, for both campaigns; with respectively 6.66 and 1.67 %. While fruits of witness trees showed average rates of infestation raised with 12, 5 and 10 %. At Ouargla region , for both campaigns, strong rates of infestation were estimated at the dates of palm trees cleaned to bagged bunches; with 16 and 12.5 %. The low rates are noticed at the palm trees which received the maintenance only. In the arid regions which are characterized by a low humidity of the air, case of the region of Ouargla, the absence of favorable conditions for the development of the date moth after the cleaning of the host which is offset by a favorable microclimate to the butterflies in the polyethylene bag.

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