Spinach (Spinacia oleracea L.), is a commercially important, widely grown and consumed vegetable in Turkey. In October 2020, typical symptoms resembling powdery mildew were observed on spinach plants in two inspected fields in Hatay province of Turkey. Circular discolorations patches accompanied with dull whitish fluffy sporulation were observed on both upper and lower leaf surfaces of plants. Conidiophores are typically formed from internal mycelium emerging through stomatal openings, either singly or in groups. Morphologically distinguished dimorphic conidia without distinct fibrosin bodies, are formed singly at the apex of conidiophores. No chasmothecia were found on heavily infected leaves over the course of the season. The identity of the disease agent was further confirmed sequencing of the ITS rDNA region of representative isolates by using ITS5/P3 and ITS1/ITS4 primers. Pathogenicity was confirmed through inoculation by touching freshly sporulating plant leaves onto the leaves of potted healthy spinach plants. Based on morphological characteristics of asexual fungal structures, molecular sequencing and pathogenicity test, the causal disease agent responsible for the spinach powdery mildew was identified as Leveillula taurica (Lév.) G. Arnaud (syn. = Oidiopsis haplophylli). To our knowledge, this is the first report of powdery mildew caused by L. taurica on S. oleracea in Turkey.

菠菜（菠菜L.），是土耳其重要的，广泛种植和食用的蔬菜。2020年10月，在土耳其哈塔伊省两个检查过的田地中，菠菜植物出现了类似白粉病的典型症状。在植物的上下叶片表面均观察到圆形变色斑并伴有钝白发白的孢子形成。分生孢子通常由通过气孔开口单独或成群出现的内部菌丝形成。形态独特的双态分生孢子，没有明显的纤维蛋白体，仅在分生孢子的顶端形成。在整个季节中，未发现重度感染的叶子上有苔藓病。通过使用ITS5 / P3和ITS1 / ITS4引物进一步证实了代表性分离株ITS rDNA区域的测序，确定了病原体的身份。通过将刚形成孢子的植物叶片接触到盆栽的健康菠菜植物的叶片上，可以确认病原性。根据无性真菌结构的形态特征，分子测序和致病性测试，确定造成菠菜白粉病的病因是taveica（Lév。）G. Arnaud（同名=  Oidiopsis haplophylli）。据我们所知，这是第一份由taurica造成的白粉病在土耳其S. oleracea上的报道。