Effect of inoculum concentration, isolates and leaf age on bacteria canker disease development in sweet cherry (Prunus avium L.) cultivars

Assessment of sweet cherry (Prunus avium L.) genotypes for response to bacterial canker disease

“…For example, 'Sweetheart', 'Rainier' and 'Bing' were more susceptible to Pss than other cultivars. This concurs with Bedford et al (2003), Mgbechi-Ezeri et al (2013) and Roche (2001) who had previously reported that 'Rainier' was susceptible in detached leaf and twig assays, while (Spotts et al 2010b) demonstrated that 'Rainier' was tolerant in an orchard experiment. A likely reason for the discrepancy in reports may be the environment where studies were conducted and/or the bacterial strain used in the studies.…”

“…The cultivars 'Rainier', and 'Sweetheart' were more susceptible to bacterial canker compared to 'Bing' and 'Chelan' This result agrees with previous findings where cv. 'Rainier', 'Sweetheart' and 'Bing' were susceptible to bacterial canker in detached leaf assays in the laboratory (Bedford et al 2003;Mgbechi-Ezeri et al 2013;Roche 2001). Compared to mid-rib and carborundum inoculations, the shoot inoculation method resulted in the greatest differentiation of disease response among the advanced selections and their parent, 'PMR-1', as well as, among the common market cultivars.…”

“…This suggests that although the advanced selections showed necrotic symptoms after inoculation with Pss, they still had some level of resistance not present in the cultivars and thus, could be considered as sources of resistance to Pss in the sweet cherry breeding program. Previous studies (Mgbechi-Ezeri et al 2013;Spotts et al 2010b) reported that 'Regina' shows resistance to bacterial canker as demonstrated by visual expressions of necrotic symptoms in the field, greenhouse and in a detached leaf assay. In this study, we also found that the advancement of P. syringae pv.…”

“…Six advanced selections 'AA', 'BB', 'CC', 'DD', 'EE', 'GG' (from'PMR-1' 9 'Rainier' or the reciprocal cross) (Olmstead et al 2001) and their parent, 'PMR-1', were chosen for this study based on their low disease response to bacterial canker in a previous detached leaf assay (Mgbechi-Ezeri 2016). Also, chosen for evaluation were five market-leading cultivars ('Regina', 'Sweetheart', 'Rainier', 'Bing' and 'Chelan'), which are known to be moderately to highly susceptible to bacterial canker (Bedford et al 2003;Mgbechi-Ezeri et al 2013;Spotts et al 2010b). All plant materials originated from the United States, and are maintained by the Washington State University sweet cherry breeding program (WSU-SCBP) located at Irrigated Agriculture Research and Extension Center, Prosser, WA.…”

Sweet cherry research world overview 2015-2017

“…The effect of the inoculum concentration and leaf age on bacteria canker disease development in sweet cherry cultivars in the USA were studied (Mgbechi-Ezeri et al 2017), where the mean score in the detached leaf assay was significantly greater than the attached leaf assay. The data provide a foundation for screening a wider sweet cherry germplasm for resistance or susceptibility to bacterial canker.…”