tailieunhanh - Determination of mycorrhizae interactions and pathogenicity of Rhizoctonia solani Kühn isolated from strawberry and Xanthium strumarium

The effects of mycorrhizal fungi on the disease severity of Rhizoctonia solani Kühn., and the role of mycorrhizal fungi on strawberry (Fragaria vesca L.) growth were investigated. Strawberry seedlings were inoculated with BioOrganics as a mycorrhizal preparation against 2 R. solani isolates, which were isolated from strawberry (RsFv) and Xanthium strumarium (RsXs). | Turk J Biol 33 (2009) 53-57 © TÜBİTAK doi: Determination of Mycorrhizae Interactions and Pathogenicity of Rhizoctonia solani Kühn Isolated from Strawberry and Xanthium strumarium Ayşenur BAYÖZEN1, Ayhan YILDIZ2 1 Republic of Turkey Ministry of Agriculture and Rural Affairs, 63400, Birecik, Şanlıurfa - TURKEY 2 Plant Protection Department, Faculty of Agriculture, Adnan Menderes University, 09100, Aydın - TURKEY Received: Abstract: The effects of mycorrhizal fungi on the disease severity of Rhizoctonia solani Kühn., and the role of mycorrhizal fungi on strawberry (Fragaria vesca L.) growth were investigated. Strawberry seedlings were inoculated with BioOrganics as a mycorrhizal preparation against 2 R. solani isolates, which were isolated from strawberry (RsFv) and Xanthium strumarium (RsXs). The highest disease severity in strawberry roots was observed after inoculation with RsFv at a rate of 67%. On the other hand, the lowest disease severity in strawberry roots was at 31% for 15BRsFv (15 days before inoculation with BioOrganics and RsFv). Similarly, the highest disease severity in plants was seen with RsXs inoculated plants at a rate of 77%. The disease severity in plants was at 35% for 15BRsXs (15 days before inoculation with BioOrganics and R. solani isolated from Xanthium strumarium L.). When strawberry leaf and shoots were evaluated, the disease severity varied as follows: 45% for RsFv, 40% for RsXs, 15% for BRsFv, 10% for BRsXs, 15% for 15BRsFv, and 5% for 15BRsXs. According to these results, there was no significant difference between the pre-inoculation of mycorrhizae (15 days) and simultaneous inoculation with a pathogen. Based on our findings, we concluded that when all plant growth parameters were treated with mycorrhizae (either alone or with R. solani) strawberry plant growth was greatly improved, and our observations showed the beneficial effects of mycorrhizae on yield. Key Words: Strawberry, mycorrhizae, .