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The aim of this study was to develop primer pairs for  Diplodia seriata  identification, one of the most common fungal species associated with grapevine decline in Castilla y León (Spain). Genetic variability of selected isolates of  D. seriata  was estimated. A molecular marker was generated from a random amplified polymorphic DNA (RAPD) fragment. PCR products of around 1200 bp were obtained with OPE20 primer. The PCR products were cloned and sequenced. The sequences were compared and a fragment of 1207 bp was used to design primer pairs. Two primer pairs were selected (DS3.8 S3-DS3.8 R6 and DS3.8 S3-DS3.8 R4) that amplified a single DNA product of 634 bp and 233 bp, respectively, with  D. seriata  isolates. No amplification was obtained for any of the 57 isolates of other species. The designed SCAR primer pairs allowed a rapid detection of  D. seriata , and were able to detect 0.1 pg of the target DNA. Detection was specific and sensitive for  D. seriata . The established protocols detected these fungi in naturally infected grapevines after DNA purification.  Diplodia seriata  was detectable without DNA purification and isolation in 62.5% to 75% of reactions. The detection of this pathogen in wood samples has great potential for use in pathogen-free certification schemes.

Development of SCAR Primers for PCR Assay to DetectDiplodia seriata