Beetroot plants cv. Boro exhibiting multiple root galls similar to those symptoms associated with root-knot nematodes (RKNs) were detected in the municipality of Rio Grande, Rio Grande do Sul state, Brazil. The nematode identification was based on an integrative taxonomy. Perineal patterns of females were similar to Meloidogyne arenaria and M. incognita whereas isoenzymatic phenotypes α-esterase A3 and malate dehydrogenase N1 were typical to M. morocciensis. Measurements of second-stage juveniles and males corresponded to the same species. Beetroot plants inoculated with 2.000 specimens of RKN showed reduction of fresh weight of shoots (37%) and roots (30%). The nematode reproduction factor was 11.9. Our study provides the first evidence that M. morocciensis causes root-knot disease in beetroot cv. Boro in Brazil and elsewhere.

甜菜根植物简历。在巴西南里奥格兰德州的里奥格兰德市，发现博罗（Boro）表现出多个根胆，类似于与根结线虫（RKNs）相关的症状。线虫鉴定是基于综合分类法。雌性的会阴模式类似于南方根结线虫和南方隐孢子虫，而同型酶表型α-酯酶A3和苹果酸脱氢酶N1是摩洛哥隐孢子虫的典型特征。第二阶段的幼体和雄性的测量值对应于同一物种。接种了2,000个RKN标本的甜菜根植株显示，新芽（37％）和根（30％）的鲜重减少。线虫繁殖因子为11.9。我们的研究提供了第一个证据，证明M. morocciensis导致甜菜根cv中的根结病。巴西和其他地方的博罗。