First report of <i>Diplodia corticola</i> in Greece on kermes oak (<i>Quercus coccifera</i>)

Tsopelas, P.; Slippers, Bernard; Gonou-Zagou, Zacharoula; Wingfield, Michael J.

doi:10.1111/j.1365-3059.2009.02244.x

Cited by 19 publications

(16 citation statements)

References 2 publications

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“…31 Diplopimarane (1) showed a molecular formula of C 19 H 26 O 3 , as deduced from its HR-ESIMS, which was consistent with seven hydrogen deficiencies. The preliminary investigation of its 1 H and 13 C NMR spectra (Table 1), in agreement with its MS data, and by comparison with those of sphaeropsidin A (9) 21 showed that it could be a nor-entpimarane. Detailed investigation of its 1 H NMR spectrum (Table 1) showed, as with sphaeropsidin A, the significant presence of the double doublet (J = 17.6 and 11.0 Hz), the two broad doublets (J = 11.0 and 17.6 Hz), and the singlet of the vinyl and the tertiary methyl groups at C-13 at δ 6.04 and 5.34 and 5.31, and 1.25, respectively.…”

Section: ■ Results and Discussionmentioning

confidence: 93%

Diplopimarane, a 20-nor-ent-Pimarane Produced by the Oak Pathogen Diplodia quercivora

et al. 2014

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In this study a new 20-nor-ent-pimarane, named diplopimarane, was isolated together with sphaeropsidins A (9) and C (10), and (+)-epiepoformin (11) from organic crude extracts of Diplodia quercivora, a recently described oak pathogen originally found on declining Quercus canariensis trees in Tunisia. Diplopimarane was characterized as (1S,2R)-2,8,8-trimethyl-2-vinyl-1,2,3,4,5,6,7,8-octahydrophenanthrene-1,9,10-triol by spectroscopic, X-ray, optical, and chemical methods. It exhibited a wide range of activities including remarkable phytotoxicity on nonhost plants such as tomato cuttings, moderate antifungal activity against important plant pathogens, and moderate zootoxicity against Artemia salina. Its derivatives (2-4 and 6) were also tested for their phytotoxic and zootoxic activities. All these derivatives proved to be active against A. salina at 200 μg/mL, while 2 and 6 were also active on tomato cuttings. The other secondary metabolites (9, 10, and 11) herein reported for D. quercivora exhibited phytotoxic, antifungal, and zootoxic activity. This is the first report on the secondary metabolites secreted in vitro by this oak pathogen that could be key components of its adaptative strategies.

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Section: ■ Results and Discussionmentioning

confidence: 93%

Diplopimarane, a 20-nor-ent-Pimarane Produced by the Oak Pathogen Diplodia quercivora

et al. 2014

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“…; Tsopelas et al. ). Furthermore, D. corticola was recently reported as a pathogen of Vitis vinifera L. (grapevine) in California Italy, Spain and Texas (Carlucci and Frisullo ; Úrbez‐Torres et al.…”

Section: Discussionmentioning

confidence: 97%

Diplodia corticola and Phytophthora cinnamomi: the main pathogens involved in holm oak decline on Caprera Island (Italy)

et al. 2013

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Summary Since 2008, severe and widespread tree decline and mortality has been observed at the main growing Quercus ilex L. (holm oak) forest on Caprera Island, Italy. To clarify the symptomatology and aetiology of this phenomenon, field surveys and isolations from symptomatic trees were carried out in summer 2010. Affected trees exhibited crown thinning, branch dieback, sunken cankers, epicormic shoots, exudates on branches and trunk, root losses and sudden death symptoms. Four fungal species belonging to Botryosphaeriaceae family, namely Botryosphaeria dothidea, Diplodia corticola, D. seriata and Neofusicoccum parvum, were isolated from cankers on trunk and branches, whereas three species of Phytophthora, namely P. cinnamomi, P. cryptogea and P. gonapodyides, were isolated from fine roots and rhizosphere soil samples. Isolates were identified using both morphological analysis and DNA‐based techniques. Pathogenicity trials on holm oak seedlings showed that all the isolated species are pathogenic. D. corticola proved to be the most aggressive species. Our results provide the first evidence for a combined involvement of D. corticola and P. cinnamomi in the aetiology of holm oak decline in Italy and suggest that these pathogens are not only important contributing factors in the onset of long‐term tree decline, but also may cause the rapid devastation of extensive oak ecosystems.

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“…Attacks of D. corticola, originally misidentified as Diplodia mutila, were reported on cork oak trees in Italy, Morocco, Portugal, Spain, and Tunisia (Alves et al 2004). The pathogen also affects other Mediterranean oak species such as Quercus afares, Q. canariensis, Q. coccifera, and Q. ilex (Linaldeddu et al 2009aTsopelas et al 2010). In recent years, D. corticola has caused concern in the United States, where it colonized aggressively Q. agrifolia, Q. rubra, and Q. virginiana (Aćimović et al 2016;Dreaden et al 2011;Lynch et al 2013).…”

Section: Stem Branch and Twig Pathogensmentioning

confidence: 99%

Endemic and Emerging Pathogens Threatening Cork Oak Trees: Management Options for Conserving a Unique Forest Ecosystem

et al. 2016

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Cork oak (Quercus suber) forests are economically and culturally intertwined with the inhabitants of the Mediterranean basin and characterize its rural landscape. These forests cover over two million hectares in the western Mediterranean basin and sustain a rich biodiversity of endemisms as well as representing an important source of income derived from cork production. Currently cork oak forests are threatened by several factors including human-mediated disturbances such as poor or inappropriate management practices, adverse environmental conditions (irregular water regime with prolonged drought periods), and attacks of pathogens and pests. All these adverse factors can interact, causing a complex disease commonly known as “oak decline.” Despite the numerous investigations carried out so far, decline continues to be the main pathological problem of cork oak forests because of its complex etiology and the resulting difficulties in defining suitable control strategies. An overview of the literature indicates that several pathogenic fungi and oomycota can play a primary role in the etiology of this syndrome. Therefore, the aim of this review is to analyze the recent advances achieved regarding the bio-ecology of the endemic and emerging pathogens that threaten cork oak trees with particular emphasis on the species more directly involved in oak decline. Moreover, the effect of climate change on the host-pathogen interactions, a task fundamental for making useful decisions and managing cork oak forests properly, is considered.

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First report of Diplodia corticola in Greece on kermes oak (Quercus coccifera)

Cited by 19 publications

References 2 publications

Diplopimarane, a 20-nor-ent-Pimarane Produced by the Oak Pathogen Diplodia quercivora

Diplopimarane, a 20-nor-ent-Pimarane Produced by the Oak Pathogen Diplodia quercivora

Diplodia corticola and Phytophthora cinnamomi: the main pathogens involved in holm oak decline on Caprera Island (Italy)

Endemic and Emerging Pathogens Threatening Cork Oak Trees: Management Options for Conserving a Unique Forest Ecosystem

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