Impact de la faune entomologique sur le deperissement de L’Eucalyptus camaldulensis dans les regions de Setif et Bordj Bouarreridj

Abstract

The Eucalyptus camaldulensis is a species of the family Myrtaceae. Robust, resistant, native to Australia, it was introduced in Algeria during the colonization in 1860. Despite its robustness, this tree is subject to many factors including degradation, for some time, that of parasitic insects that mostly it fatal. Outputs performed on the ground (Zrazria, Ras El Oued, Sétif, and Beni Aziz) from October 2012 to October 2013), helped to advance the causes of dieback of Eucalyptus camaldulensis related insects. The results were used to highlight the Presence of 3 Harmful insects: Leptocybe invasa, Ophelimus maskelli (galllicoles insects Hymenoptera, Eulophidae) and Glycaspis brimblecombei (Hemiptera, Psyllidae). A host of other species has been studied to identify the presence of parasitoids such Closterocerus Chamaeleon (Hymenoptera) parasitoid of Ophelimus maskelli and Psyllaephagus bliteus (Hymenoptera, Encyrtidae) parasitoid of Glycaspis brimblecombei. These parasites of other insects live permanently or temporary. In all 7 orders in 18 families with 22 species determined. Three major orders, Hymenoptera, Coleoptera and Hemiptera alone represent 18 species, while Lepidoptera Zygentoma, Dermaptera and Diptera are represented by only one species. Statistical analysis of the time series showed that the two species gall Leptocybe invasa and Ophelimus maskelli are at their peak in June and July.