Comparative study regarding in vitro infections with Erwinia amylovora and Pseudomonas syringae pv. syringae on pomaceae species

Abstract

The knowledge about pome fruit trees bacterioses and their evolution in orchards is a major objective for plant protection. Erwinia amylovora and Pseudomonas syringae pv. syringae cause on attacked organs of Pomaceae species similar dieback symptoms in vegetative and flowering shoots of quince, pear and apple in spring. Both bacteria can produce disastrous diseases in orchards and are therefore of great economic importance. Biological materials represented by vegetative shoots, leaves and fruits of Pyrus spp., Malus spp., Cydonia spp. were used after isolation of different E. amylovora and Ps. syringae pv. syringae strains for in vitro infections. Results presented in this study established that for in vitro inoculation of Pomaceae species similar symptoms in case of leaves and, respectively different symptoms for vegetative shoots and fruits occurred. The occurrence time was the only difference, because Ps. syringae pv. syringae spread faster than E. amylovora. The vegetative shoots inoculated with E. amylovora, in comparison to Ps. syringae pv. syringae, were more damaged and for both bacteria the highest values for attack degree were recorded in case of pear species, followed by quince and apples, respectively.