Observations on spot caused by Fusicladium oleagineum on olives (Olea europaea) in New South Wales, Australia

Sergeeva, Vera; Braun, Uwe; Spooner-Hart, Robert; Nair, N. Unnikrishnan

doi:10.1071/dn09011

Cited by 9 publications

(3 citation statements)

References 6 publications

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“…The age-related resistance may be associated with water-repellent waxes accumulated on leaves surface which prevent the formation of an optimal water film for the pathogen germination. In fact, older leaves are more cutinized than the younger ones and are more resistant to OLS [49,58]. The thicker cuticle of older leaves may block the penetration of the pathogen compared to younger leaves [59].…”

Section: Discussionmentioning

confidence: 99%

Differential Response of Olive Cultivars to Leaf Spot Disease (Fusicladium oleagineum) under Climate Warming Conditions in Morocco

Habbadi,

Maafa,

Benbouazza

et al. 2023

Horticulturae

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Olive leaf spot (OLS), also called olive scab and peacock eye, caused by Fusicladium oleagineum, is a major disease that causes significant damage to olive trees. However, we still lack information about how cultivar and environmental factors influence disease development. In this study, evaluation of the incidence and severity on twenty olive cultivars (Olea europaea L.), maintained in an ex situ collection in Morocco, was carried out monthly during the period from March to July 2021. Biochemical parameters were also evaluated for each cultivar including leaf chlorophyll, polyphenols and flavonoid contents. Results revealed that the OLS incidence was highly correlated with severity (r = 0.94) and found to be related to climatic conditions and cultivars. The studied cultivars were classified into four major groups, i.e., susceptible, moderately susceptible, moderately resistant and resistant. Finally, our investigations revealed a partial relationship between resistance to the OLS disease and phenolic and flavonoid leaf contents, supporting the assumption of the potential involvement of such components in cultivar resistance to the disease. Overall, our work highlights the importance of characterizing olive cultivar resistance to OLS in driving the choice of the best varieties for an effective control of the disease in specific warming regions such as Morocco.

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Section: Discussionmentioning

confidence: 99%

Differential Response of Olive Cultivars to Leaf Spot Disease (Fusicladium oleagineum) under Climate Warming Conditions in Morocco

Habbadi,

Maafa,

Benbouazza

et al. 2023

Horticulturae

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“…Olive leaf spot (OLS) caused by Venturia oleaginea (Castagne) Rossman & Crous (the anamorph: Spilocaea oleaginea) is a dangerous olive disease widespread in the Mediterranean regions where it can cause severe yield losses [1][2][3][4]. It is characterized by premature defoliation, twig dieback, and, when infections are very severe, reduced flowering and fruit set [5][6][7][8]. The pathogen can also attack the fruit, causing delayed ripening, decreased oil content and unacceptable blemishes on table olives [5,9].…”

Section: Introductionmentioning

confidence: 99%

No- or Low-Content Copper Compounds for Controlling Venturia oleaginea, the Causal Agent of Olive Leaf Spot Disease

Almadi,

Jarrar,

Sbaihat

et al. 2024

Plants

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The efficacy of using a synthetic (azoxystrobin + difenoconazole), copper-based (copper oxychloride) and low-content copper compound (copper complexed with gluconate and lignosulphonate) fungicides for controlling Venturia oleaginea, the causal agent of olive spot disease, was evaluated in an olive (cv. Nabali) orchard located in the Kafr Qud area (Palestine) in 2017–2018. Treatments were applied at three different times (February, April, and August). In January 2017, at the beginning of the experiment, about 90% of the leaves grown in 2016 were infected. Defoliation was determined by counting the leaves on the labeled branches initially and then periodically. It increased gradually in both the control and treated trees, but those treated with azoxystrobin + difenoconazole or with copper complexed with gluconate and lignosulphonate showed a slower defoliation rate. During 2017, new shoots grew and new leaves developed. All treatments reduced the drop of new leaves with respect to the control, with positive effects on the reproductive activity (inflorescence growth and yield). Overall, all treatments significantly reduced the disease, thus indicating the possibility of greatly reducing infections if treatments are regularly applied each year, also with traditional (copper-based) fungicides. Due to their capability of penetrating inside the vegetative tissue, azoxystrobin + difenoconazole or copper complexed with gluconate and lignosulphonate reduced/slowed down the drop of infected leaves. The use of these fungicides is therefore particularly recommended when olive leaf spot disease is severe. The use of low-content copper compounds allows the amount of metallic copper used for the treatments against V. oleaginea to be greatly reduced.

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“…Species in the family Botryosphaeriaceae are emerging as important olive pathogens causing leaf spot, fruit rot and branch dieback in different countries and continents [14,22]. In addition to Botryosphaeria dothidea, the causal agent of Dalmatian disease [23], Neofusicoccum mediterraneum, N. luteum, and N. parvum have recently been reported in Australia, California, Croatia, Italy, Spain, and Uruguay as emerging olive pathogens [21,[24][25][26][27][28]. At the same time, over the last decade, reports of root and collar rot and sudden-death symptoms in young and mature olive trees caused by Phytophthora spp.…”

Section: Introductionmentioning

confidence: 99%

Diversity and Pathogenicity of Botryosphaeriaceae and Phytophthora Species Associated with Emerging Olive Diseases in Italy

et al. 2023

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Extensive collar rot, sunken and bleeding cankers, shoot blight, and fruit rot symptoms on olive trees have recently been observed in several orchards in Italy. Since there is little information about the etiology of these diseases and given the high economic relevance of this iconic crop, a study was conducted from autumn 2017 to summer 2022, in four Italian regions, to define the occurrence, distribution and impact of the main pathogens involved. A total of 1064 symptomatic olive samples were collected and processed. Based on colony appearance, micromorphological analysis and DNA sequence data, thirty-eight species, including eighteen Botryosphaeriaceae species belonging to five genera and fifteen Phytophthora species, were isolated and identified, thirteen of which, Diplodia africana, D. fraxini, D. subglobosa, Dothiorella omnivora, Do. sarmentorum, Do. sempervirentis, Sardiniella urbana (Botryosphaeriaceae), Phytophthora cactorum, P. cinnamomi, P. citricola, P. crassamura, P. niederhauserii and P. pseudocryptogea, are reported here for the first time in olive trees. Pathogenicity tests performed on unripe drupes and on potted olive seedlings completed Koch postulates and highlighted that several species of Botryosphaeriaceae and Phytophthora represent a growing threat to olive trees.

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Observations on spot caused by Fusicladium oleagineum on olives (Olea europaea) in New South Wales, Australia

Cited by 9 publications

References 6 publications

Differential Response of Olive Cultivars to Leaf Spot Disease (Fusicladium oleagineum) under Climate Warming Conditions in Morocco

Differential Response of Olive Cultivars to Leaf Spot Disease (Fusicladium oleagineum) under Climate Warming Conditions in Morocco

No- or Low-Content Copper Compounds for Controlling Venturia oleaginea, the Causal Agent of Olive Leaf Spot Disease

Diversity and Pathogenicity of Botryosphaeriaceae and Phytophthora Species Associated with Emerging Olive Diseases in Italy

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