Resistance of Olive Tree to Spilocaea oleagina

Resistance of Olive Tree to Spilocaea oleagina

Amal Zine El Aabidine, Yves Baissac, Abdelmajid Moukhli, Christian Jay-Allemand, Bouchaib Khadari and Cherkaoui El Modafar | View Article To understand the resistance of the olive tree to the leaf-spot disease caused by Spilocaea oleagina, the constitutive and postinfectional synthesis phenolic compounds of the leaves were analyzed by HPLC in 110 genotypes F1 (susceptible cultivar “Picholine marocaine” x resistant cultivar “Picholine du Languedoc”) presenting of the differential behaviours to this disease (highly resistant, resistant, intermediate, susceptible & highly susceptible genotypes). The HPLC analysis distinguished 15 majors phenolic compounds according to their chromatographic and spectral characteristics into five phenolic families (hydroxycinnamic derivatives, flavonoids, verbascoside derivatives, tyrosol derivatives, oleuropein...
Characterization and Pathogenicity of Botryosphaeriaceae Species

Characterization and Pathogenicity of Botryosphaeriaceae Species

Juan Moral, Concepción Muñoz-Díez, Nazaret González, Antonio Trapero, and Themis J. Michailides | View Article Species in the family Botryosphaeriaceae are common pathogens causing fruit rot and dieback of many woody plants. In this study, 150 Botryosphaeriaceae isolates were collected from olive and other hosts in Spain and California. Representative isolates of each type were characterized based on morphological features and comparisons of DNA sequence data of three regions: internal transcribed spacer 5.8S, β- tubulin, and elongation factor. Three main species were identified as Neofusicoccum mediterraneum, causing dieback of branches of olive and pistachio; Diplodia seriata, causing decay of ripe fruit and dieback of olive branches; and Botryosphaeria dothidea, causing dalmatian disease on unripe olive fruit in...
Epidemiology, histopathology and aetiology of olive anthracnose

Epidemiology, histopathology and aetiology of olive anthracnose

P. Talhinhas, C. Mota-Capita˜o, S. Martins, A. P. Ramos, J. Neves-Martins, L. Guerra-Guimara˜es, V. Va´rzea, M. C. Silva, S. Sreenivasaprasad and H. Oliveira | View Article Anthracnose is an important disease affecting mature olive fruits, causing significant yield losses, and poor fruit and oil quality. In Portugal, high anthracnose incidence was recorded during 2003–2007 with 41%of 908 orchards surveyed displaying disease symptoms. In another 14% of the orchards, the pathogen was recorded in symptomless plants. Disease severity was on average 36%, frequently reaching 100%. In Portugal, anthracnose is endemic to neglected orchards of susceptible cultivars, but under favourable conditions it can also severely affect less susceptible...
First report of olive anthracnose caused by Colletotrichum gloeosporioides in Tunisia

First report of olive anthracnose caused by Colletotrichum gloeosporioides in Tunisia

Ali Rhouma, Mohamed Ali Triki and Monji Msallem | View Article Ripe and overripe olive fruits (cv. Meski, Manzanilla and Picholine) showing circular spots 1 to 10 mm in diameter, slightly depressed and reddish-brown in color, were collected from local markets and orchards located in the regions of Takelsa, Zarzis and Rgueb in Tunisia. Colletotrichum gloeosporioides was isolated from symptomatic fruits and Koch’s postulates were fulfilled. This is the first report of Colletotrichum gloeosporioides causing anthracnose of olives in...
Genetic variation in Spilocaea oleagina populations from New Zealand olive groves

Genetic variation in Spilocaea oleagina populations from New Zealand olive groves

Friday O. Obanor, Monika Walter, E. Eirian Jones, Judith Candy and Marlene V. Jasper | View Article Olive leaf spot caused by the fungus, Spilocaea oleagina, is the most important leaf disease of olives in many olive-growing regions worldwide with yield losses of up to 20%. The genetic structure of S. oleagina populations was investigated with universally primed-polymerase chain reaction (UP-PCR) techniques. Ninety-eight S. oleagina isolates were collected from 12 known and 4 unknown cultivars from olive groves in five New Zealand...