Search for Resistance to Verticillium-Wilt and Leaf Spot in Olive

Ciccarese, F.; Ambrico, A.; Longo, O.; Schiavone, D.

doi:10.17660/actahortic.2002.586.153

Cited by 12 publications

(6 citation statements)

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“…Although studies on the resistance to VW in olive (Ciccarese et al 2002;López-Escudero et al 2004) established different levels of susceptibility between olive cultivars, in this study no significant differences in pathogen prevalence among cultivars were found. Therefore these results suggest that several factors are more important than olive cultivar for disease development: irrigation, plant density, plant age, and other factors more difficult to quantify, such as olive Pathogen prevalence affecting different ages of olive trees in irrigated and non-irrigated orchards management and environmental conditions.…”

Section: Plant Densitycontrasting

confidence: 70%

Agricultural factors affecting Verticillium wilt in olive orchards in Spain

et al. 2008

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In recent years, the spread of Verticillium wilt in olive orchards, caused by the soil-borne pathogen Verticillium dahliae, is often related to intensive modern farming of highly productive cultivars, planted at high densities, usually irrigated, and under a mechanised system. The effects of agricultural factors associated with olive orchards were investigated in an important olive-growing area in southern Spain, as tools in predicting outbreaks of the disease. A stratified double-sampling technique was designed to determine the number of olive orchards needed to survey. A sampling survey was conducted from 2002 to 2005 in 873 olive orchards randomly selected, the owners were interviewed for details of agronomic factors, and orchards were inspected for the presence or absence of the disease. Polymerase chain reaction assays were carried out for identifying V. dahliae pathotypes. Pathogen prevalence showed a significant linear correlation with the mean plant density (r 2 = 0.93), associated predominantly with a less virulent non-defoliating pathotype (r 2 =0.96). Overall, irrigation × high density caused disease incidence to peak in super-high-density olive-tree-planting systems. Olive orchards that had V. dahliae, however, did not differ in pathogen prevalence regardless of the olive cultivars. Young olive orchards were significantly more affected by V. dahliae than were old ones, particularly orchards with trees 8 to 12 years old. Irrigation increased pathogen prevalence and disease incidence in very young orchards (<7 years old). The prevalence of the non-defoliating pathotype was statistically high in young orchards whereas the prevalence of a highly virulent defoliating pathotype was high in old orchards.

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Section: Plant Densitycontrasting

confidence: 70%

Agricultural factors affecting Verticillium wilt in olive orchards in Spain

et al. 2008

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“…A conidial suspension was prepared by flooding the colonies with sterile distilled water and filtering the suspension through four layers of muslin gauze to separate mycelial and conidial fractions. The concentration of conidia was adjusted with sterile distilled water to 4 × 10 6 CFU/ml (Tsror (Lahkim) et al., 1998; Ciccarese et al., 2002). The olive twigs were placed in test tubes containing the conidia suspension, while the control twigs were placed in sterile water (modified from Tsror (Lahkim) and Erlich, 1996).…”

Section: Inoculation Of Olive Twigsmentioning

confidence: 99%

Vegetative Compatibility and Pathogenicity of Verticillium dahliae Kleb. Isolates from Olive in Israel

Tsror

Levin

2003

Journal of Phytopathology

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Fifty‐two isolates of Verticillium dahliae from olive trees grown at different locations in Israel were assigned to vegetative compatibility groups (VCGs), using nitrate non‐utilizing (Nit) mutants. A higher frequency of nit1/nit3 mutants (95%) was obtained compared with NitM (5%), with 81% of the isolates being assigned to VCG4B and 19% to VCG2A. The pathogenicity of 14 randomly selected isolates (seven of each VCG) was tested on olive twigs (cv. Picual) and tomato. VCG4B and VCG2A isolates were similarly aggressive on olive. However, VCG2A isolates were more aggressive on tomato (line 139) than the VCG4B isolates as indicated by a higher colonization index.

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“…Some studies showed that very few olive cultivars have resistance properties (Wilhelm & Taylor 1965;Hartmann et al 1971;Schnathorst & Sibbett 1971;Tjamos 1993;Sesli et al 2010). In Spain, studies on olive resistance to Verticillium wilt (Ciccarese et al 2002;López-Escudero et al 2004) led to establishment of different levels of susceptibility among olive cultivars. No significant differences in pathogen prevalence among olive cultivars were found (Rodriguez et al 2008).…”

Section: Discussionmentioning

confidence: 99%

Reaction of selected apple cultivars to wilt pathogen Verticillium dahlia

Karajeh¹,

Owais²

2012

Plant Prot. Sci.

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Karajeh M.R., Owais S.J. (2012): Reaction of selected apple cultivars to wilt pathogen Verticillium dahlia. Plant Protect Sci., 48: 99-104.The reaction of five apple cultivars to olive wilt caused by Verticillium dahliae Kleb was evaluated. Five apple cultivars (Royal Gala, Delicious Anabri, Double Red, Golden Delicious, Granny Smith) and one olive cultivar (Nabali Mohassan) were inoculated with V. dahliae and grown under partially controlled greenhouse conditions. Typical symptoms of the disease were developed on the inoculated olive seedlings. However, all tested apple cultivars did not show the typical symptoms of Verticillium wilt except cv. Delicious Anbari, which showed 8.31% disease severity. The average percentage of disease severity was 61.2% in Nabali Mohassan. The pathogen was positively re-isolated from the inoculated seedlings of cvs Nabali Mohassan and Delicious Anbari after 12 months from the inoculation date. Results indicate that an apple plantation to replace dead or severely diseased olive trees infested with Verticillium wilt is an appropriate low-cost and environmentally sound IPM alternative approach to control Verticillium wilt.

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Search for Resistance to Verticillium-Wilt and Leaf Spot in Olive

Cited by 12 publications

References 0 publications

Agricultural factors affecting Verticillium wilt in olive orchards in Spain

Agricultural factors affecting Verticillium wilt in olive orchards in Spain

Vegetative Compatibility and Pathogenicity of Verticillium dahliae Kleb. Isolates from Olive in Israel

Reaction of selected apple cultivars to wilt pathogen Verticillium dahlia

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