Pomegranate (Punica granatum) is an important fruit-tree at southwestern Turkey, as this region (Antalya and Muğla provinces) produces and exports the great majority of the pomegranate fruits of the country. Pomegranate orchards showing severe dieback and tree mortality in the region were surveyed to determine the role of Phytophthora spp. in symptom development. Root (from 51 trees) and soil (from 136 trees) samples were collected from symptomatic trees in 113 commercial pomegranate orchards, covering 170 ha. A total of 98 isolates were obtained from the roots of 19 trees and soil samples of 79 trees, using selective medium and soil baiting. Species isolated were identified by morphological characteristics and ITS sequencing. The most frequently isolated species were P. nicotianae (37 isolates) and P. palmivora (26 isolates), followed by P. parvispora (14 isolates), P. inundata (six isolates), P. cryptogea (four isolates), P. niederhauserii (four isolates), P. taxon walnut (two isolates) and P. rosacearum (one isolate), and four unidentified species. Twelve orchards were infected with more than one species. Disease incidence and prevalence were 4.59% and 69.91%, respectively. Pathogenicity tests by soil infestation, revealed that the isolates caused root and collar rot, reducing root weights of pomegranate seedlings. Phytophthora palmivora and P. nicotianae were the most virulent species. This is the first report of any species other than P. palmivora causing root and collar rot of pomegranate trees worldwide.

石榴（Punica granatum）是土耳其西南部重要的果树，因为该地区（安塔利亚和穆拉省）生产和出口该国绝大部分的石榴果。对在该地区表现出严重的枯死和树木死亡率的石榴园进行了调查，以确定疫霉菌的作用。在症状发展中。在113个商品化的石榴园中，从有症状的树木中收集了根茎（51棵树）和土壤（136棵树）样品，占地170公顷。使用选择性培养基和土壤诱饵，从19棵树的根和79棵树的土壤样品中获得了98种分离株。通过形态特征和ITS测序鉴定分离的物种。最常见的物种是P. nicotianae（37株）和Palmi Pora（26株），其次是P. parvispora（14株），inundata（6株），cryptogea（4株），niederhauserii（4株）， P.紫杉核桃（两个分离株）和P. rosacearum（一个分离株），以及四个未鉴定物种。十二个果园被一种以上的物种感染。疾病发生率和患病率分别为4.59％和69.91％。通过土壤侵染进行的致病性测试表明，这些分离物引起了根和领腐烂，减轻了石榴幼苗的根重。疫霉疫霉和烟草疫霉是最有毒的物种。这是除棕榈果假单胞菌以外引起全球石榴树根腐烂的任何物种的首次报道。