Abstract
Eucalyptus camaldulensis is an essence of the family Myrtaceae. It resists a certain salt content and the sea wind. Despite that, it subject to many factors of degradation as parasitic and harmful insects. In the last years, an insect is detected on the foliage of Eucalyptus camaldulensis trees in Algeria (North-East region). The results made it possible evidence the presence of one harmful species Leptocybe invasa Fisher & La Salle 2004 (Hymenoptera: Eulophidae), this parasite has been detected in 2006, The Chronology of Gall’s emergence of Leptocybe invasa and its field infestation rate were followed since 2010, in Eucalyptus plantation in the North-East Region. Some statistical methods of Gall’s emergence of this pest is reviewed and discussed. First, after exploration, we selected the most affected trees, second, we organized the samples of each tree, we respected the orientation (North-South-East-West). For each study site 10 trees were marked. 30 leaves of each tree were removed, so it is 300 leaves for each site, which were analyzed. We used the method of time series that connects the time with the number of galls. This study is based on the number of galls observed, on both sides of the leaves. In order to highlight the degree of attack of pests. The outputs were made from October 2012 to October 2013, due to two outputs per month.
 Keywords: Eucalyptus, gall wasps, Eulophidae, gall inducers, Algeria.
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