Name: Guignardia citricarpa Kiely. Anamorph: Phyllosticta citricarpa (McAlpine) Van der Aa (macroconidial state). Synonyms: Phoma citricarpa McAlpine. Citrus black spot is a fungal disease caused by Guignardia citricarpa. This Ascomycete fungus affects citrus plants throughout subtropical climates, causing a. Guignardia citricarpa Kiely, Proceedings of the Linnean Society of New South Wales () [MB#].

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Description Top of page Ascomata of G. Hard spots are the most common lesions. Notes on the principal cryptogamic diseases of citrus in several countries of eastern Asia Japan, Formosa, Hong Kong and the Philippines. Guignardia citricarpa is a plant pathogensome strains of which cause a leaf condition called black spot on citrus plants.

The effects of waxing citrus fruit. Journal of Taiwan Agricultural Research, 21 4: Plant Disease, 69 First confirmed report of citrus black spot caused by Guignardia citricarpa on sweet oranges Citrus sinensis in Uganda. Cultural and morphological comparison on Phoma citricarpa and P.

Crop loss, aetiology, and epidemiology of citrus black spot in Ghana.

Often black spot can be identified with considerable certainty if hard spot lesions with pycnidia are present. Postharvest applications of fungicides are generally less effective in guginardia symptom development Andrade et al.

They are large, slightly raised, dark brown spots. Asci are cylindrical, clavate, and each citricarap eight spores. Prolonged periods of wetness prevent pseudothecia formation since the leaves are rapidly colonized by competing saprobes. Rodriguez and Mazza Gaiad, ; Foguet et al.

Further details may be available for individual ciricarpa in the Distribution Table Details section which can be selected by going to Generate Report. The non-pathogen can be distinguished by its faster growth, colony type, and production of pycnidia in ascocarps in culture.


Studies on Sphaeropsidales in culture. If there is more than one age of fruit present on the tree, it is possible for the asexual spores on the fruit to be transferred to new fruit, intensifying the disease. Latent infections are common on leaves and occasionally symptoms appear.

However, in vitro production of ascospores by G. Encyclopedia of Life EOL. Australasian Plant Pathology, 10 3: Phyllostictina citricarpa McAlpine Petr. Pycnidia are often apparent in these lesions.

Survival of Phyllosticta citricarpa, anamorph of the citrus black spot pathogen. Preliminary studies on Guignardia citricarpa n. Unlike hard spot lesions, no pycnidia are present. Strict regulation and management is necessary to control this disease since there are currently no citrus varieties that are resistant. Leaf infection with citrus black spot and perithecial development in relation to ascospore discharge of Guignardia citricarpa Kiely.

Reclassification of an isolate of Guignardia citricarpa from New Zealand as Guignardia mangiferae by sequence analysis.

Most browsers are initially set up to accept cookies, since this is required by most website owners in order to access their sites. Efeito da combinatpo de fungicidas sistOmicos e protetores no controle da mancha preta dos frutos citricos causada por Guignardia citricarpa.

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Citrus black spot in the Northeast of Entre Rios: Previous records of Guignardia on citrus in some countries may involve the non-pathogenic species Guignardia mangiferae.

Sanitation The removal of infected, off-season fruit may be useful to reduce conidial inoculum in some situations Kotze, Cookies are small text files that contain a string of characters and uniquely identifies a browser.


No pycnidia form on these lesions and the pathogen is difficult to isolate. Diagnosis is also complicated by the morphological similarities of the fungal structures to the non-pathogenic strain Guignarida mangiferae.

Citrus black spot – Wikipedia

One method is the increase the mircrosprinkler irrigation in the grove to half an hour for at least five days of the week.

Postharvest applications of fungicides are guginardia less effective in preventing symptom development Andrade et al. Virulent spots are large, slightly sunken and spread irregularly over large areas of the mature fruit. Preliminary studies on Guignardia citricarpa n.

Phyllosticta citricola Hori ex Hara, J. The panel pointed out that it is known to occur only in summer rainfall citrus production areas and that the only way it has been spread to new areas has been through infected propagation material moved to areas where the climate is suitable for its establishment.

Any condition s All condition s. Guignardia differs from Guignxrdia in having unilocular ascomata, smaller ascospores and different anamorphs. These spots are crater-like with a light centre, a dark-brown to black rim, and often have a green halo on mature orange fruit. When several references are cited, they may give conflicting information on the status. Though there are some hosts that are more susceptible to Citrus Black Spot than others, any citrus plant that is nutritionally stressed increases its chances of infection.

EPPO, ; Bassimba et al.