Abstract
AbstractDieback caused byErwinia psidiiis currently one of the most important emerging diseases in eucalypt plantations in Brazil. However, little is known in terms of the host range of this pathogen or the potential sources of resistance against the disease it causes. In this study, we inoculated plants of species from nine families to gain insight into the host range ofE. psidii. Plants of all inoculated species of Myrtaceae exceptAcca sellowianaexhibited disease symptoms and therefore represent potential hosts for the pathogen under natural conditions. In addition, the response of fourCorymbiaspecies, 29Eucalyptusspecies and three interspecificEucalyptushybrids to inoculation withE. psidiiwas evaluated. AllCorymbia henryi,Corymbia maculata,Eucalyptus thozetiana,Eucalyptus cloeziana,Eucalyptus viminalis,Eucalyptus dalrympleanaandEucalyptus pilularisplants were highly resistant to the pathogen, whereas differential disease resistance was observed in the other species. This study provides important information on sources of resistance toErwinia psidiiwith potential use in the development of clones with enhanced resistance in eucalypt species of economic importance.
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