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Using virulence tests, Vegetative Compatibility Grouping (VCG) and Amplified Fragment Length Polymorphism (AFLP) analyses, we investigated the genetic structure of V. dahliae isolates collected from different olive growing regions. In all, 42 isolates of V. dahliae from diseased olive trees were tested. Cluster analysis and principal coordinate analysis revealed that geographic origin was the main factor determining the genetic structure of V. dahliae populations and both http://www.selleckchem.com/products/VX-770.html methods indicated a genetic separation between the central and coastal isolates. Isolates were divided into two major groups: the AFLP-I group included all isolates from Sidi Bouzid, Kairouan, Kasserine and Sfax (center of the country) and the AFLP-II group included isolates from Monastir, Zaghouane, Sousse, Mahdia (Coastal region), and two isolates from Sfax. Analysis of the molecular variance (AMOVA) indicated a significant level of genetic differentiation among (76%) and within (23%) the two populations. Analyses of both the defoliating (D) and non-defoliating (ND) pathotypes and VCG markers indicated that most of the isolates belong to VCG 2A and 4B/ND pathotype. The disease severity was highly variable among the isolates tested (P http://www.selleck.cn/products/mi-773-sar405838.html the genetic diversity of the isolates and their geographic origin, but not between genetic diversity and virulence patterns. This article is protected by copyright. All rights reserved. ""Papaya ringspot virus type P (PRSV-P) systemically infects Carica papaya and species belonging to the family Cucurbitaceae. Attempts to recover PRSV-P from naturally infected cucurbit plants grown near or among diseased papaya trees have shown conflicting results worldwide. This study aimed to evaluate the natural infection of cucurbit species grown among and near papaya trees infected with PRSV-P in Brazil. Natural infection of cucurbits with PRSV-P occurred in zucchini squash but not in watermelon and cucumber. However, several attempts to recover PRSV-P from numerous Cucurbita pepo cv. Caserta (zucchini http://www.selleckchem.com/products/Imatinib-Mesylate.html squash) plants grown 5�C80?m from diseased papaya trees in the field failed. Mechanical inoculations of Cucurbita pepo cv. Caserta, Cucurbita maxima cv. Exposi??o (pumpkin), Cucumis sativus cv. Primepack Plus (cucumber) and Citrullus lanatus cv. Crimson Sweet (watermelon) with five Brazilian PRSV-P isolates showed that zucchini squash was the most susceptible species followed by watermelon and cucumber, while pumpkin was not infected. The results confirmed the variable susceptibility of cucurbit species to experimental and natural PRSV-P infection.