Fusarium rot of melon, caused by species of the genus Fusarium, has become an important postharvest disease for many Brazilian producers. Due to the delayed onset of symptoms, this disease is often only detected when fruits arrive at the importing country, thus generating economic loss for the exportation of the fruit. This study was developed with the aim of investigating which Fusarium species cause fruit rot in melon and to evaluate any differences in aggressiveness and development of symptoms. Species were identified through phylogenetic analysis of two loci and morphological markers. The 28 isolates obtained from diseased melon fruits of different commercial cultivars were identified as Fusarium falciforme (FSSC), F. sulawesiense, F. pernambucanum (FIESC), and F. kalimantanense (FOSC). Three isolates belong to a new phylogenetic lineage within the F. fujikuroi species complex (FFSC). All isolates were tested for pathogenicity, and first symptoms of rot in Canary melon were observed 2 days after inoculation. Isolates of F. falciforme and F. sulawesiense were shown to be more aggressive. Our results extend information on Fusarium species that cause fruit rot in melon and support the development of management strategies, as there is currently no efficient control for this disease. To our knowledge, this is the first report of the occurrence of species of the FSSC, FOSC, and FFSC from muskmelon fruits in Brazil.

中文翻译：

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瓜的镰刀菌腐烂是由几种镰刀菌引起的

瓜腐镰刀菌引起的属种镰刀，已成为许多巴西生产商一个重要的采后病害。由于症状的延迟发作，通常仅在水果到达进口国时才发现该病，从而为水果的出口造成经济损失。进行这项研究的目的是调查哪种镰刀菌会导致瓜果腐烂，并评估侵略性和症状发展的任何差异。通过对两个基因座和形态标记的系统发育分析来鉴定物种。从不同的商业栽培品种的患病瓜水果中获得的28株被鉴定为镰刀菌falciforme（FSSC），˚F。sulawesiense，F。pernambucanum（FIESC）和F. kalimantanense（FOSC）。三种分离物属于F.kujikuroi物种复合体（FFSC）中的一个新的系统发育谱系。测试所有分离株的致病性，并在接种后2天观察到金丝雀瓜腐烂的最初症状。F. falciforme和F. sulawesiense的分离物显示更具攻击性。我们的结果扩展了镰刀菌的信息导致瓜果腐烂并支持管理策略发展的物种，因为目前尚无对这种疾病的有效控制。据我们所知，这是关于巴西甜瓜果实中FSSC，FOSC和FFSC种类的首次报道。