Pseudomonas syringae. pv.morsprunorum on wild cherry for timber production: outbreak and field susceptibility

Abstract

In central Italy, Pseudomonas syringae pv. morsprunorum was isolated from wild cherries {Prunus avium) that had been planted for timber production. Biochemical tests were consistent with those characterizing the pathovar. Pathogenicity tests yielded necrotic lesions, shot holes on the leaves and decoloration of the tissues beneath the twig periderm, but no symptoms on inoculated lilac and pear leaves. In addition, whole-cell protein profiles of the isolates and reference strains were remarkably homogenous when analysed by cluster analysis. All isolates were negative in ice-nucleation activity and in antifungal-compound production. The main symptoms observed in the field were cankers on twigs, branches and trunks, as well as withering of the shoots. Evaluation of the field susceptibility of 18 clones indicated that the following selections must be considered susceptible to the pathogen: Montemignaio, Piantata Catenaia, Puzzolo, Raggiolo, Pozzacce 2, Pozzacce 1, Paradision. AIpe 2 seems to be less susceptible.

Pseudomonas syringaeDiseases of Fruit Trees: Progress Toward Understanding and Control

“…morsprunorum, syringae, persicae, and avii in greenhouse-and field-grown plants (72,78,94). Challenges include the length of time involved, difficulties in screening for resistance, the acceptance by growers of new varieties, and the establishment of new orchards.…”

Evolution, genomics and epidemiology of Pseudomonas syringae

“…Epidemiological studies of P. syringae have traditionally focused on the distribution of P. syringae in the environment, linking disease emergence and progression with environmental variables to generate predictive models, and identifying major sources of inoculum (e.g. plant debris and soil) for outbreak events (Beattie and Lindow, ; Bonn and Gitaitis, ; Bonn et al ., ; Ercolani et al ., ; Fryda and Otta, ; Hirano and Upper, , Hollaway et al ., ; Langston et al ., , McCarter et al ., ; Mirik et al ., ; Sahin, ; Scortichini and Tropiano, ; Scortichini et al ., ; Voloudakis et al ., ; Wechter et al ., ). Although significant advances in the identification and functional characterization of virulence factors have been made in the last decade, interest in P. syringae epidemiology largely stalled until recent technological advances and the discovery of the global distribution of P. syringae and its association with global water cycles (Cai et al ., ; Morris et al ., , 2010, 2013; Vinatzer et al ., ).…”

Genomic characterization of three novelPseudomonasphages within the subfamily ofAutographivirinaeisolated from organic waste

“…Pseudomonas syringae is a gram-negative, rod-shaped bacterium. Strains of P. syringae are ubiquitous epiphytic plant pathogens and different strains can infect a wide range of important agricultural plant species, causing diseases such as bacterial canker of wild cherries [1] and kiwifruit [2], bacterial speck of tomato [3] and leaf blight in wheat [4]. The widespread problem with P. syringae in agricultural plants calls for an inexpensive, sustainable method for preventing or treating bacterial infections.…”