The pitch canker pathogen Fusarium circinatum has caused devastation to Pinus spp. in natural forests and non-natives in commercially managed plantations. This has drawn attention to the potential importance of Fusarium species as pathogens of forest trees. In this study, we explored the diversity of Fusarium species associated with diseased Pinus patula, P. tecunumanii, P. kesiya and P. maximinoi in Colombian plantations and nurseries. Plants displaying symptoms associated with a F. circinatum-like infection (i.e., stem cankers and branch die-back on trees in plantations and root or collar rot of seedlings) were sampled. A total of 57 isolates were collected and characterised based on DNA sequence data for the translation elongation factor 1-α and β-tubulin gene regions. Phylogenetic analyses of these data allowed for the identification of more than 10 Fusarium species. These included F. circinatum, F. oxysporum, species within the Fusarium solani species complex and seven novel species in the Fusarium fujikuroi species complex (formerly the Gibberella fujikuroi species complex), five of which are described here as new. Selected isolates of the new species were tested for their pathogenicity on Pinus patula and compared with that of F. circinatum. Of these, F. marasasianum, F. parvisorum and F. sororula displayed levels of pathogenicity to P. patula that were comparable with that of F. circinatum. These apparently emerging pathogens thus pose a significant risk to forestry in Colombia and other parts of the world.

沥青溃疡病原体圆形镰刀菌已对松属植物造成破坏。在天然林中，而在商业管理的人工林中则是非本地人。这引起了人们对镰刀菌种作为森林树木病原体的潜在重要性的关注。在这项研究中，我们探讨的多样性镰刀与疾病相关物种松孔雀草，P. tecunumanii，P.思茅和P. maximinoi在哥伦比亚种植园和苗圃。植物表现出与F.circinatum样感染有关的症状（即，对人工林中树木的茎萎缩和分支枯萎以及幼苗的根部或衣领腐烂进行了采样。总共收集了57个分离株，并根据DNA序列数据对翻译延伸因子1-α和β-微管蛋白基因区域进行了鉴定。通过对这些数据进行系统发育分析，可以鉴定出超过10种镰刀菌。这些包括F. circinatum，尖孢镰孢，所述内物种茄病镰刀菌物种复杂和七个新种在镰孢恶苗物种复杂（原赤苗病菌物种复合体），其中有五个在这里被描述为新的。新种的选定菌株为他们的致病性进行了测试松孔雀草，并与比较F. circinatum。其中，F. marasasianum，F. parvisorum和F. sororula显示致病性水平P.孔雀草那名与可比F. circinatum。因此，这些明显出现的病原体对哥伦比亚和世界其他地区的林业构成了重大风险。