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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However, with the development of resistance Herbert and Grech, many growers have returned to the use of protectant sprays or combinations of systemic and protectant products Citricarpw et al.
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No harmful effects from leaf infection have been reported. This Ascomycete fungus affects citrus plants throughout subtropical climates, causing a reduction in both fruit quantity and quality.
Studies on the black spot of citrus Guignardia citricarpa Kiely. The anamorph of the black spot fungus was first described by McAlpine and designated Phoma citricarpa McAlpine. If they prove successful for detection and identification of species using colonized plant material they should greatly speed diagnosis of black spot.
Clearly, living or dead vegetative tissues represent a high risk for introduction since airborne ascospores can be produced on these tissues under favourable conditions. In both countries the fungus was thought to have been found, but after further testing it was identified as the non-pathogenic strainGuignardia mangiferaerather than the pathogenic strain Guignardia citricarpa which causes Citrus Black Spot. It is unlikely that conventional breeding will produce commercially useful, tolerant cultivars in the foreseeable future.
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Some losses to fruit drop occurred in years favourable for disease development and when fruit was held on the trees past peak maturity. Phyllostictina citricarpa McAlpine Petr. Grapefruit Lemon Lime Orange. Catalogue of Life CoL. Upon maturing, the mycelium grows into the outer rind, also known as a flavedo.
Notes on the principal fungus diseases of citrus fruits observed in certain Eastern Asian countries Japan, Formosa, Hong Kong and the Philippines. Click on the language titles to launch them. Effect of climatic factors on the development and discharge of ascospores of the citrus black spot fungus.
Citrus black spot – Wikipedia
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. Different tissues are susceptible to infection at different times. A method for detection of G. These trees must be removed because those that are declining and stressed will often have off season bloom. Plant trash should be moved with caution if at all to avoid spreading the infectious ascospores.
Retrieved 3 December Conidia produced on the leaves and fruit in the canopy are capable of infecting the leaves and fruit.
Citrus black spot
The latent occurence in citrus and other hosts of a Guignardia easily confused with G. Latent infections are common on leaves and occasionally symptoms appear. Australasian Plant Pathology, 42 4: Encyclopedia of Life EOL. However, now that black spot is well established in areas of southern South America, fruit losses may periodically be severe.
Specimens and strains links: Retrieved 27 February Identification, Biology and Control”. They are guignradia, slightly raised, dark brown spots. Distribution Table Vitricarpa of page The distribution in this summary table is based on all the information available. Go to distribution map The lesions of hard spot generally occur on mature fruit and are several millimeters in diameter. However, in vitro production of ascospores by G.
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