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.
