Abstract
In this study, which takes place in the northeast of Algeria at the region of Guelma between January 2016 and June 2017, we were able to follow the spatio-temporal evolution of the main hemipteran pests in an orchard of citrus (orange variety). This monitoring showed the presence of 12 hemipteran species, their appearance in the orchard is closely linked to the sap flow. The most abundant species was Aleurothrixus floccosus. The number of the other species that found was very small or absent in most of the time. We also noted that Aonidiella aurantii and Chrysomphalus dictyospermi had a preference to develop in the center of the tree while the other species found, which are: Dialeurodes citri, Aphis gossypii, Aphis spiraecola, Lepidosaphes beckii, Parlatoria ziziphi, Saissetia olea, Coccus hesperidum, Coccus pseudomagnoliarum and Icerya purchasi, were found in the sunniest parts of the tree.
Highlights
IntroductionSeveral hemipteran species are associated with citrus, the most common being whiteflies (Onillon & Abbassi, 1973; Benmessaoud-Boukhalfa & Chebrou, 2014), aphids (Benhalima-Kamel et al, 1994; Lebbal & Laamari, 2016), scales (Campolo et al, 2014; Dao et al, 2017) and leafhoppers (Zina et al, 2013)
The results obtained during the 18 months of monitoring, showed the presence of the following species: Aleurothrixus floccosus, Dialeurodes citri, Aphis gossypii, A.spiraecola, and eight species of scales which are Aonidiella aurantii, Lepidosaphes beckii, Parlatoria ziziphi, Chrysomphalus dictyospermi, Saissetia olea, Coccus hesperidum, C. pseudomagnoliarum and Icerya purchasi
The temporal monitoring of these species showed that the California red scale had a peak of development during March 2016 and the woolly whitefly showed a main large peak during February 2016
Summary
Several hemipteran species are associated with citrus, the most common being whiteflies (Onillon & Abbassi, 1973; Benmessaoud-Boukhalfa & Chebrou, 2014), aphids (Benhalima-Kamel et al, 1994; Lebbal & Laamari, 2016), scales (Campolo et al, 2014; Dao et al, 2017) and leafhoppers (Zina et al, 2013). The damage of these insects on the tree is important, either directly by their sucking sap or indirectly, as a vector of virus causing viral disease, like in the case of the aphid Toxoptera citricida Kirkaly, 1907 vectoring the causing agent of tristeza (Tang et al, 1999). We want to know the pest species richness of the study orchard and the spatio-temporal variations of the pests in this region
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