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Citrus black spot : ウィキペディア英語版 | Citrus black spot
Citrus Black Spot is a fungal disease caused by Guignardia citricarpa. This Ascomycete fungus affects citrus plants throughout subtropical climates, causing a reduction in both fruit quantity and quality. Symptoms include both fruit and leaf lesions, the latter being critical to inter-tree dispersal. Strict regulation and management is necessary to control this disease since there are currently no citrus varieties that are resistant. ==Fungus== ''Guignardia citricarpa'' is a plant pathogen, some strains of which cause a leaf condition called ''black spot'' on citrus plants.〔http://www.doacs.state.fl.us/pi/pest_alerts/pdf/citrus-black-spot-pest-alert.pdf〕 As a result, such strains are subject to phytosanitary legislation in the European Union and the United States. Metabolites secreted by ''G. citricarpa'' have an inhibitory growth effect on some endophytic bacterial species, and stimulatory growth effect on others. An isolate of ''G. citricarpa'' was found to produce the medically important compound taxol under certain growth conditions.
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