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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Knowledge Bank home Change location. Some attempts have been made to produce tolerant hybrids using sour orange as a source of resistance Anon.

Sweeter fruit with black spot. Lily Eurwilaichitr and Dr. A mancha preta dos frutos cftricos causada por Phoma citricarpa. Plant Disease, 8 The second method is to apply urea or ammonium to the leaf litter. The widespread non-pathogenic strain is now designated Guignardia guignardja and the citrus black spot pathogen as Guignardia citricarpa.

Guignardia citricarpa (citrus black spot)

Brain McOnie KC, Distribution Top of page Previous records of Guignardia on citrus in some countries may involve the non-pathogenic species Guignardia mangiferae. 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. Book Category Production Commons. Plant Disease, 96 8: Mechanical removal of leaf litter from the orchard floor reduces disease pressure and facilitates control, but is costly.


Archived from the original on If they prove successful for detection and identification of species using colonized plant material they should greatly speed diagnosis of black spot.

Cookies mentioned in the last point are Google analytics cookies guitnardia are IP anonymized which means that we cannot trace single users. The situation in Hong Kong, Swaziland and Nigeria is still unclear.

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Living trees or even budwood could carry quiescent infections. No pycnidia form on these lesions and the pathogen is difficult to isolate. Chemical Control Due to the variable regulations around de- registration of pesticides, we are for the moment not including any specific chemical control recommendations.

The anamorph probably plays only a minor role in the disease cycle Timmer, ; Kotze, Leaves are susceptible up to citridarpa months of age. Thus infections probably occur throughout spring until at least citricwrpa whenever conditions are favorable. A mancha preta dos frutos um dos fatores limitantes a produtpo citrfcola do estado do Rio de Janeiro.

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Citrus black spot

Type specimen or ex type: Gazette New South Wales, 8: Lesions are small, sunken necrotic spots with light centre and a dark rim and may have a chlorotic halo. Google Wikimedia Wikipedia Wikispecies. More Spanish version Dr. Plant Pathology, 58 2: Yuignardia vitro production of ascospores and pathogenicity of Guignardia citricarpa, causal agent of citrus black spot.


citrus black spot Guignardia citricarpa Kiely

Postharvest waxing also decreased the manifestation of symptoms following postharvest storage Wild, The pathogen is most readily isolated from these types of lesions and pycnidia may eventually form. Guignadia of climatic factors on the development and discharge of ascospores of the citrus black spot fungus.

Identification of species of Guignardia from citrus requires isolation of the slow-growing fungus and comparison of several of the above-listed traits to verify the identity.

Notes on ciitricarpa principal cryptogamic diseases of citrus in several countries of eastern Asia Japan, Formosa, Hong Kong and the Philippines. European Journal of Plant Pathology, 5: Ascospores are carried by wind throughout the canopy and long distances beyond Huang and Chang, Asci are cylindrical, clavate, and each contain eight spores.

Postharvest applications of fungicides are generally less effective in preventing symptom development Andrade et al. Genetic modification holds more promise for guignardiw resistant cultivars, but progress is likely to be citricarppa using these methods. These trees must be removed because those that are declining and stressed will often have off season bloom. Citrus and Sub-tropical Fruit Journal, Further details may be available for individual references in the Distribution Table Details section which can be selected by going to Generate Report.


Catalogue of Life CoL. The effects of fungicides and fertilization on the control of black spot of citrus Guignardia citricarpa. Some losses to fruit drop occurred in citricarpw favourable for disease development and when fruit was held on the trees past peak maturity. The infection in leaves usually remains latent until the leaves drop, but leaf spots may be found on older leaves. Studies in Mycologia, 5: EPPO, ; Guignarxia et al.

Latent infections are common on leaves and occasionally symptoms appear.

These cookies allow us to see information on user website activities including, but not limited to page views, source and time spent on a website. However, the fungus colonizes the leaf as a saprophyte after the leaf dies and eventually forms pycnidia or pseudothecia.