Glycaspis brimblecombei Moore (Hem.: Aphalaridae) is an invasive species for the Mediterranean area on several species of Eucalyptus, especially E. camaldulensis, the River Red Gum, hence its common name. It was reported in Italy, in Campania, Lazio and Basilicata in June 2010, and is spreading quickly in most of the country. Infestations of G. brimblecombei are most easily recognized by the very peculiar conical white coverings (lerps) secreted by the preimaginal stages. Damages consist in lymph subtraction and leaf drop, honeydew and lerps also cause inconveniences in urban environment. The Red gum lerp psyllid is considered a serious pest that may cause severe defoliation and tree mortality on some Eucalyptus spp. The specific parasitoid Psyllaephagus bliteus Riek (Hym.: Encyrtidae), was accidentally introduced in Italy in 2011 and recorded in Campania since 2012. The monitoring was carried out from the first year of introduction of the psyllid and continued after the introduction of the parasitoid. Initially only the population dynamics of the psyllid was monitored assessing the average number of psillyd for leaf in different time ranges with similar temperature values. In order to determine the active parasitism, after the parasitoid introduction, with the dissections of the psyllid it was obtained the parasitization dynamic. A model, based on the classical Volterra predator-pray equations, was also developed in the first year of introduction to follow the host-parasitoid dynamics in relation of the environmental condition.The study proposes an accurate method for population monitoring of the psyllid and its parasitoid. Observations prove that both species are well established in the new environmental condition and overwinter in all stages. Moreover, the use of different values of the host growth rate in the Lotka-Volterra model describes the overall trend of the unstable dynamics that characterise the parasitoid-host interaction, although the specific oscillations are not observed.
The Red gum lerp psyllid Glycaspis brimblecombei Moore: a monitoring approach / Margiotta, Marina; Laudonia, Stefania. - (2015), pp. 27-27. (Intervento presentato al convegno SISEF 10° Congresso Nazionale Firenze, 15-18/09/2015 .Sostenere il pianeta, boschi per la vita Ricerca e innovazione per la tutela e la valorizzazione delle risorse forestali tenutosi a Firenze nel 15 -18/09/2015).
The Red gum lerp psyllid Glycaspis brimblecombei Moore: a monitoring approach
MARGIOTTA, MARINA;LAUDONIA, STEFANIA
2015
Abstract
Glycaspis brimblecombei Moore (Hem.: Aphalaridae) is an invasive species for the Mediterranean area on several species of Eucalyptus, especially E. camaldulensis, the River Red Gum, hence its common name. It was reported in Italy, in Campania, Lazio and Basilicata in June 2010, and is spreading quickly in most of the country. Infestations of G. brimblecombei are most easily recognized by the very peculiar conical white coverings (lerps) secreted by the preimaginal stages. Damages consist in lymph subtraction and leaf drop, honeydew and lerps also cause inconveniences in urban environment. The Red gum lerp psyllid is considered a serious pest that may cause severe defoliation and tree mortality on some Eucalyptus spp. The specific parasitoid Psyllaephagus bliteus Riek (Hym.: Encyrtidae), was accidentally introduced in Italy in 2011 and recorded in Campania since 2012. The monitoring was carried out from the first year of introduction of the psyllid and continued after the introduction of the parasitoid. Initially only the population dynamics of the psyllid was monitored assessing the average number of psillyd for leaf in different time ranges with similar temperature values. In order to determine the active parasitism, after the parasitoid introduction, with the dissections of the psyllid it was obtained the parasitization dynamic. A model, based on the classical Volterra predator-pray equations, was also developed in the first year of introduction to follow the host-parasitoid dynamics in relation of the environmental condition.The study proposes an accurate method for population monitoring of the psyllid and its parasitoid. Observations prove that both species are well established in the new environmental condition and overwinter in all stages. Moreover, the use of different values of the host growth rate in the Lotka-Volterra model describes the overall trend of the unstable dynamics that characterise the parasitoid-host interaction, although the specific oscillations are not observed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
