INEDES   24797
INSTITUTO DE ECOLOGIA Y DESARROLLO SUSTENTABLE
Unidad Ejecutora - UE
artículos
Título:
Feeding preference of Thaumastocoris peregrinus on several Eucalyptus species and the relationship with the profile of terpenes in their essential oils
Autor/es:
MASUH, H.; DUHOUR, A.; COVIELLA, C.; COVIELLA, C.; NASPI, C.; NASPI, C.; LUCIA, A.; LUCIA, A.; LILJESTHRÖM, G.; RIQUELME, M.; SANTADINO, M.; LILJESTHRÖM, G.; RIQUELME, M.; SANTADINO, M.; MASUH, H.; DUHOUR, A.
Revista:
PHYTOPARASITICA
Editorial:
SPRINGER
Referencias:
Año: 2017 vol. 45 p. 395 - 406
ISSN:
0334-2123
Resumen:
The feeding preference by Thaumastocoris peregrinus, Carpintero and Dellapé (Heteroptera: Thaumastocoridae) on different Eucalyptus species was evaluated through choice tests in a paired comparisons design. Twenty individuals per combination were tested over a 48 h period, and each one was offered leaves of two species at a time, in all possible combinations. Preference was determined by counting the number of insect excrements on each plant as a proxy for effective feeding, and then ranked through a paired comparison matrix. A linearity index was calculated to test for hierarchy preferences and, after that, a cardinal index (David?s score) was calculated to assign a preference value for each species. The essential oils were extracted from leaves of each Eucalyptus species, and their chemical composition determined through GC-MS. The results show a significant and strictly linear feeding preference ranking between the species tested. The order of preference between species was E. viminalis > E. grandis > E. tereticornis > E. dunnii > E. maidenii > E. globulus. The qualitative and quantitative chemical compositions of the essential oils of these Eucalyptus species differed. A significant correlation was found between the feeding preferences and the concentrations of 1,8-cineole as a repellent and p-cymene as a feeding stimulant. These results underline the importance of selecting the right Eucalyptus species in areas infested by T. peregrinus.