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Thaumastocoris peregrinus (Hemiptera,Thaumastocoridae) and Glycaspis brimblecombei Moore (Hemiptera, Psylloidea), are eucalyptus pest native to Australia. They were also detected within the main European and North African infested areas. This study, carried out in CRSN/Lwiro, Kabare, South Kivu in eastern of the DRC, aimed to assess the origins and the seasonal incidences of eucalyptus dieback during the two consecutive years 2015 and 2016 dry (March to August or Season B) and rainy seasons. Two species are responsible of eucalyptus dieback in CRSN/Lwiro of hemiptera order, Thaumastocoris peregrinus Carpintero & Dellapé in Thaumastocoridae family and Glycaspis brimblecombei Moore (1964) in Psyllidae family were captured and identified. The number of healthy eucalyptus is very high during the rainy season and the attack of the insect is very high in the dry season and the infested plants and relative abundance of eucalyptus are very high during dry season to compare to rainy period. Near future activity should focus on the question whether the parasitoid and eucalyptus species strength to G. brimblecombei, T. peregrinus are already present in DRC or should be introduced.