Composición química del aceite esencial de 13 especies de Eucalyptus y su relación con la infestación del psílido del escudo Glycaspis brimblecombei Moore (Homoptera:psilidae)

ALEJANDRO LUCIA; EDUARDO ZERBA; MASUH HECTOR

Puerto Iguzaú

Congreso; 4to Congreso Forestal Argentino y Latinoamericano; 2013

Secretaría de Agricultura, Ganadería y Pesca del a Nación

1. Glycaspis brimblecombei is a pest insect that affects Eucalyptus (Myrtaceae) genus and was firstly detected in Argentina in 2005. The main objective of this study is to determine the level of infestation in different Eucalyptus species and the correlation to the chemical composition of their essential oils (EOs). In an experimental plantation of 13 Eucalyptus species, the natural presence of the psyllid in the abaxial face of the leaves was determined and the mean number of individuals per specie was calculated. The essential oils were extracted by hydrodistillation and analyzed for their chemical composition by gas chromatography-mass spectrometry. 2. The results showed that 7 out of 13 species were not affected by G. brimblecombei (E. dunnii, E. globulus maidenii, E. globulus ssp. globulus, E. viminalis, E. cinerea, E. sideroxylon and E. gunnii). E. tereticornis and E. camaldulensis were the most affected whereas the infestation in E. grandis x E. tereticornis and E. grandis x E. camaldulensis was intermediate. E. saligna y E. grandis were the less affected species. 3. The relative concentration of the compounds 1,8-cineole, α and β-phellandrene in the essential oils are highly correlated to the rate of infestation with G. brimblecombei (Nº Lerps =-9,39 + 0,55 * 1,8-cineole (%) + 58,19 * β-phellandrene (%) - 92,39 * α-phellandrene (%). R2: 99,9; F: 3550,5; Pvalue Model: 0,0003).