Invasive Species Compendium

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Abstract Full Text

Association of Geotrichumcitri-Aurantii with citrus fruits decay in Iran.

Abstract

An outbreak of citrus sour rot disease occurred on citrus fruits in northern of Iran during the autumn season of 2012. Isolations were made from rotted fruits on PDA and CMA media. Afungus consistently isolated from the diseased fruits formed white-to-cream colonies on the media. Pathogenicity was confirmed by needle-stab inoculation at the fruits. Based onmorphological, pathogenicity and intergenic transcribed spacer (ITS-PCR) region and ITS-RFLP analysis, all isolates were identified as Geotrichumcitri-aurantii, the causal agent of sour rot of citrus. Several cultivars of citrus fruits were evaluated for their susceptibility to the causal agent. Tested fruits were ranked for their susceptibility to the G. citri-aurantii by determining disease severity based on mean lesion size. Citrus were classified into three groups using Duncan's multiple range test, include: most susceptible: (cvs: Onshiu and Ponkan), moderately susceptible: (cvs. Clementine, Page and King), oranges (cvs. Thomson Navel and Washington Navel), sweetlime and Grapefruit (cv. Marsh), and the least susceptible: Valencia and Sour orange. Based onthe results obtained here, the disease severity would be in correlation with the fruits firmness. To our knowledge this is the first report of G. citri-aurantii causing sour rot on citrus fruit from Iran.