Feeding preference of Thaumastocoris peregrinus on several Eucalyptus species and the relationship with the profile of terpenes in their essential oils |
| |
| Authors: | M Santadino A Lucia A Duhour M Riquelme C Naspi H Masuh G Liljesthröm C Coviella |
| |
| Institution: | 1.Laboratorio de Zoología Agrícola, Departamento de Tecnología y Programa de Ecología Terrestre, INEDES. UNLu – CONICET,Buenos Aires,Argentina;2.Centro de Investigaciones de Plagas e Insecticidas UNIDEF- CITEDEF-CONICET,Buenos Aires,Argentina;3.Laboratorio de Ecología, Departamento de Ciencias Básicas, Programa de Ecología Terrestre e INEDES, UNLu– CONICET,Buenos Aires,Argentina;4.CEPAVE, UNLP – CONICET,Buenos Aires,Argentina |
| |
| Abstract: | 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. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
