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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Spatial pattern of black spot incidence within citrus trees related to disease severity and pathogen dispersal. It is important to note that while ascospores can infect fruit, they have not yet been observed developing on fruit. Along with these methods it is also important to get rid of debris such as fallen fruit or twigs in a manner that reduces the chances of infecting other plants.
Epidemiology and control of citrus black spot in South Africa. Genetic modification holds more promise for developing resistant cultivars, but progress is likely to be slow using these methods. First confirmed report of citrus black spot caused by Guignardia citricarpa on sweet oranges Citrus sinensis in Uganda.
Citrus black spot
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Goes and Feichtenberger, ; Goes at al. However, conidia produced on dead leaves can only reach susceptible fruit and leaves by splash dispersal into the canopy.
Citficarpa of satsuma mandarin influenced by thiophanate-methyl treatment and mechanical injuries. Strict regulation and management is necessary to control this disease since there are currently no citrus varieties that are resistant.
Citrucarpa black spot disease of citrus and its control in South Africa. The lesions of hard spot generally occur on mature fruit and are several millimeters in diameter.
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This off season blooming is often more problematic with Valencia oranges when old and new crops overlap. Australasian Plant Pathology Matches exactly Value is undefined. Do not make more than 2 sequential applications of strobilurin fungicides. An infection peg penetrates the cuticle and epidermis to form quiescent infections on leaves or fruit.
Citrus black spot – Wikipedia
Studies on the black spot disease of citrus caused by Guignardia citricarpa Kiely with particular reference to its epiphytology and control at Lebata. Proceedings of the International Society of Citriculture, Leaf lesions are uncommon on ctricarpa citrus but may be more frequent on lemons.
Often black spot can be identified with considerable certainty if hard spot lesions with pycnidia are present. The importance of dispersal by fruit has been questioned since the fungus produces only cihricarpa conidia on symptomatic fruit Kotze, Postharvest waxing also decreased the manifestation of symptoms following postharvest storage Wild, It argued that Citrus Black Spot has never spread to cittricarpa areas with fruit as the cause and citrus fruit has never been shown to be the cause of the spread of the disease.
Most of the losses in Australia and South Africa have been due to the external blemishes which make fruit unsuitable for the fresh market.
It is unlikely that conventional breeding will ctiricarpa commercially useful, tolerant cultivars in the foreseeable future. In vitro production of ascospores and pathogenicity of Guignardia citricarpa, causal agent of citrus black spot. Black spot on citrus-Ghana.
Guignardia citricarpa (citrus black spot)
Letters on the diseases of plants: Host-Plant Resistance Sour orange Citrus aurantium is one of the few species of citrus that is resistant to black spot. Spore trapping and rainfall and dew measurements have been helpful in determining the timing of ascospore release and xitricarpa need for fungicide applications in South Africa Kotze, Knowledge Bank home Change location.
Metabolite secreted by G. Goes A de, Register new name species, genus, family, etc Register new type specimen of existing taxa epitype, neotype, etc. For further information, we recommend you visit the following resources: