Fire blight of pome fruits in Jordan: disease development and response of different fruit cultivars to the disease

Al-Dahmashi, M.S; Khlaif, Hamed

doi:10.1016/j.scienta.2003.10.007

Cited by 11 publications

(5 citation statements)

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“…described severity of fire blight in natural conditions for numerous pear cultivars and species from the National Collection of Romania. Al-Dahmashi and Khlaif (2004) reported that quince varieties 'Assansah' and 'Humice', pear varieties 'Comice' and 'Coscia', and apple varieties 'Royal Gala', 'Golden Mor Spur' and 'Fuji' were susceptible, and that apple variety 'Delbarestival' and pear variety 'Williams' were moderately susceptible to fire blight.…”

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confidence: 99%

Levels of fire blight (Erwinia amylovora) susceptibility of native apple, pear and quince germplasm from Lake Van Basin, Turkey

2011

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Fire blight resistance of apple, pear and quince genetic resources from Lake Van Basin (eastern Turkey) was tested using Erwinia amylovora strain Ea Van. Shoot tips of 92 native accessions (48 accessions for apple, 38 accessions for pear and 6 accessions for quince) were wounded for inoculation, and artificially inoculated with pathogenic bacteria under greenhouse conditions. The levels of resistance of accessions were classified in comparison with control varieties according to the genotype susceptibility index (GSI%) scores based on the lesion length on shoots of each genotype. Fire blight resistance of accessions consisted of five classes: resistant (R), moderately resistant (MR), moderately susceptible (MS), susceptible (S) and highly susceptible (HS). GSI% scores differed significantly among accessions from each fruit species (p<0.01). GSI values ranged from 12.4% to 64.1% for apple genotypes, from 17.2% to 55.1% for pear genotypes, and from 17.8% to 43.4% for quince genotypes. No resistant genotypes of apple, pear and quince were observed. Seven accessions of apple, two accessions of pear and one accession of quince were MR. 25 accessions of apple, 14 accessions of pear and one accession of quince were MS. These findings indicate a considerable variation in fire blight resistance and could contribute to breeding efforts regarding fire blight resistance in apple, pear and quince.

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Levels of fire blight (Erwinia amylovora) susceptibility of native apple, pear and quince germplasm from Lake Van Basin, Turkey

2011

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Section: Resultsmentioning

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“…The susceptibility of PI1/6 to fire blight was probably due to its parent Kontoula which is very susceptible to this disease (unpublished data). BC Williams has been reported as a moderately susceptible cultivar to fire blight (Al-Dahmashi, Khlaif 2004;Severin et al 1999). Hodnocení afinity odrůd hrušní BC Williams a PI1/6 se 49 genotypy kdouloní a jejich citlivosti ke spále růžokvětých ABSTRAKT: Práce je zaměřena na hodnocení roubové snášenlivosti odrůd BC Williams a PI1/6 se 49 genotypy kdouloní.…”

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“…Over the last few years the pear cultivation has been limited in Greece because of fire blight, which is a very destructive disease caused by the bacterium Erwinia amylovora. Some researchers reported that the cultivar BC Williams is moderately susceptible to fire blight (Al-Dahmashi, Khlaif 2004;Severin et al 1999), while others described it as susceptible (Bagnara et al 1994). The aim of this study was to evaluate the compatibility of the pear cultivars BC Williams and PI1/6 with 49 quince genotypes.…”

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Evaluation of BC Williams and PI1/6 pear cultivars for their compatibility with 49 quince genotypes and their susceptibility to fire blight: Short communicaton

Thomidis¹,

Tsipouridis²

2006

Hort. Sci. (Prague)

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ABSTRACT:In this study, the compatibility of the pear cultivars PI1/6 and BC Williams with 49 quince genotypes was evaluated. The results showed that the cv. PI1/6 had a good compatibility with several of the quince genotypes, and the cv. BC Williams only with a few of them. Differences were also found in their susceptibility to fire blight (Erwinia amylovora). The cultivar PI1/6 was very susceptible, while the cultivar BC Williams was relatively tolerant. RESULTS AND DISCUSSIONThe compatibility between rootstock and cultivar is a crucial factor that should be considered before making the decision to establish a pear orchard. The quince rootstocks are widely used in pear orchards, because of their good adaptation in Greek soil and climate conditions; they are also suitable Values are the mean of 5 consecutive years (Rivalta et al. 1989a,b;Sansavini et al. 1997).The results also showed that the cultivar PI1/6 was very susceptible (mean of index = 7.8), while the cultivar BC Williams was rather tolerant (mean of index = 4.3) ( Table 2). Ten of the PI1/6 trees died during the experiments; in contrast, no BC Williams tree died. The susceptibility of PI1/6 to fire blight was probably due to its parent Kontoula which is very susceptible to this disease (unpublished data). BC Williams has been reported as a moderately susceptible cultivar to fire blight (Al-Dahmashi, Khlaif 2004;Severin et al. 1999). Hodnocení afinity odrůd hrušní BC Williams a PI1/6 se 49 genotypy kdouloní a jejich citlivosti ke spále růžokvětých ABSTRAKT: Práce je zaměřena na hodnocení roubové snášenlivosti odrůd BC Williams a PI1/6 se 49 genotypy kdouloní. Část těchto genotypů měla dobrou afinitu s novou řeckou odrůdou PI1/6 a několik z nich i s odrůdou BC Williams. Rozdíly mezi těmito odrůdami byly nalezeny i po stránce jejich citlivosti ke spále růžokvětých (Erwinia amylovora). Odrůda PI1/6 byla velmi citlivá, zatímco odrůda BC Williams byla vůči této chorobě relativně tolerantní.

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“…All species from the Rosaceae family except European plum (Prunus domestica) supported epiphytic populations of the pathogen, whereas nonrosaceous plants were generally poor supporters of epiphytic growth. Similarly, rosaceous ornamental shrubs like Cotoneaster, Crataegus, Malus, Pyracantha and Sorbus taxa in the vicinity of orchards can also serve as important inoculum sources, but still, despite warnings and regulations, no sufficient attention is paid to them (Thomson et al 1975;Al-Dahmashi and Khlaif 2004;Bubán 2007). Even though populations of E. amylovora present on flowers of alternate hosts may not cause disease, the flowers of rosaceous non-disease-host species could serve as potential sites of inoculum increase during their periods of bloom, because vectors of E. amylovora, principally bees, visit many kinds of flowers in landscape areas between pear and apple orchards (Johnson et al 2006;Bubán 2007).…”

Section: Hosts Of Fire Blightmentioning

confidence: 99%

Floral traits affecting fire blight infection and management

Farkas

Mihalik

Dorgai³

et al. 2011

Trees

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Erwinia amylovora, the causative agent of fire blight, colonizes primarily the flowers of the sub-family Maloideae. Commercially important fruit tree species such as apple (Malus domestica) and pear (Pyrus communis) are also affected by the disease. Epiphytic bacterial populations develop on the stigma, from where the pathogen colonizes the hypanthium, aided by moisture. Under favorable conditions, nectar provides a rich medium for growth, which allows bacterial invasion of tissues through the stomata of the nectary. The paper reviews various floral traits that may play a role in the onset and progression of the infection. Flower age, stigma morphology and longevity, the size of epiphytic bacterial population, morphology of the hypanthium, anatomy of the nectary, dynamics of nectar secretion, as well as the volume, concentration and composition of the nectar are discussed in detail, comparing traits of susceptible versus tolerant apple and pear cultivars. Management programs, aiming at the suppression of E. amylovora on floral parts by antibiotics, chemical compounds, natural substances or biological control agents, are also discussed.

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Fire blight of pome fruits in Jordan: disease development and response of different fruit cultivars to the disease

Cited by 11 publications

References 11 publications

Levels of fire blight (Erwinia amylovora) susceptibility of native apple, pear and quince germplasm from Lake Van Basin, Turkey

Levels of fire blight (Erwinia amylovora) susceptibility of native apple, pear and quince germplasm from Lake Van Basin, Turkey

Evaluation of BC Williams and PI1/6 pear cultivars for their compatibility with 49 quince genotypes and their susceptibility to fire blight: Short communicaton

Floral traits affecting fire blight infection and management

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