Abstract
Field surveys of 80 commercial groves were made in autumn 2003 in six major Syrian olive‐growing regions. A total of 300 olive samples, representative of the main cultivars grown in the country, were collected. As ascertained by dsRNA analysis, 54 out of 125 samples (about 43%) showed visible bands in polyacrylamide gel electrophoresis. All samples were tested by RT‐PCR for the presence of the following viruses: Arabis mosaic virus (ArMV), Cherry leaf roll virus (CLRV), Cucumber mosaic virus (CMV), Olive latent ringspot virus (OLRSV), Olive latent virus 1 (OLV‐1), Olive latent virus 2 (OLV‐2), Olive leaf yellowing‐associated virus (OLYaV) and Strawberry latent ringspot virus (SLRSV). All these viruses, singly or in mixed infection, were detected in about 51% of the samples. CMV was the most prevalent (22.7%), followed by CLRV (15%), OLYaV (14.3%) and OLRSV (11.5%). Less represented were the remaining four viruses. Infection rates ranged from 44% in Dara’a region to 67% in Latakia and Hama.
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