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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Black spot of citrus. Some losses to fruit drop occurred in years favourable for disease development and when fruit was held on the trees past peak maturity. Guignardia citricarpa Kiely, When several references are cited, they guignzrdia give conflicting information on the status.

Citrus black spot

Pairwise sequence alignments Polyphasic identifications. Prevention and Control Top of page Exclusion Efforts have been made to exclude black spot from areas where it is not currently present. However, conidia produced on dead leaves can only reach susceptible fruit and leaves by splash dispersal into the canopy.

At the end ofthe European Commission announced a ban on most imports of citrus fruit from South Africa because of concerns about the possible transmission of Citrus Black Spot to the EU. Spore trapping and rainfall and dew measurements have been helpful in determining the timing of ascospore release and the need for fungicide applications in South Africa Kotze, Guignardia differs from Botryosphaeria in having unilocular ascomata, smaller ascospores and different anamorphs.


Goes A de, Feitchtenberger E, No differences were found between the two taxa in morphology, sporulation or other characteristics when grown on several types of media at varying temperatures.

Phyllosticta citricola Hori, Engei no Tome: Journal of Taiwan Agricultural Research, Letters on the diseases of plants: There is no resistance citriarpa Citrus Black Spot and once a tree has been infected there is no known cure causing tree removal to be the best option. Proceedings of the International Society of Citriculture, 5: It is citgicarpa that conventional breeding will produce commercially useful, tolerant cultivars in the foreseeable future. Citrus black spot – Citrus Diseases”.

Currently the anamorph is Phyllosticta citricarpa with a Leptodothiorella spermatial state van der Aa, Development and validation of a fast PCR-based detection method for pathogenic isolates of the citrus black spot fungus, Guignardia citricarpa. In vitro production of ascospores and pathogenicity of Guignardia citricarpa, causal agent of citrus black spot. Preliminary studies on Guignardia citricarpa n.

Guignardia citricarpa

The lesions of hard spot generally occur on mature fruit and are several millimeters in diameter. Guignardia citricarpa will infect all types of citrus plants; however, there are some plants that are more susceptible to the pathogen than others.

Contains Matches exactly Value is undefined. You can prevent the information generated by the Google cookie about your use of our Sites from being collected and processed by Google in the future by downloading and installing Google Analytics Opt-out Browser Add-on for your current web browser. Any condition s All condition s. This is to ensure that we give you the best experience possible. Virulent spots are large, slightly sunken and spread irregularly over large areas of guuignardia mature fruit.


citrus black spot (Guignardia citricarpa)

Red-brown, pin-point dots may citricarppa into larger, circular necrotic lesions with gray centers and red or brown margins. 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. Postharvest Fruit from black spot-infested groves often bear quiescent infections that may later develop into black spot lesions in transport or at the final destination Hall, Different tissues are susceptible to infection at different times.

Open the calendar popup. Once a species of Guignardia has been isolated from symptomatic tissue, the species involved must be determined. Most browsers are initially set up to accept cookies, since this is required by most website owners in order to access their sites.

Journal of the Korean Society for Horticultural Science, 34 4: Distribution Maps of Plant Diseases. Fruit are susceptible for at least months after petal fall.