Department of Biology, College of Science, United Arab Emirates University, Al-Ain 15551, UAE.
Khalifa Center for Genetic Engineering and Biotechnology, United Arab Emirates University, Al-Ain 15551, UAE.
Int J Mol Sci. 2020 Feb 4;21(3):1033. doi: 10.3390/ijms21031033.
In the United Arab Emirates (UAE), royal poinciana () trees suffer from stem canker disease. Symptoms of stem canker can be characterized by branch and leaf dryness, bark lesions, discoloration of xylem tissues, longitudinal wood necrosis and extensive gumming. General dieback signs were also observed leading to complete defoliation of leaves and ultimately death of trees in advanced stages. The fungus, DSM 109897, was consistently recovered from diseased royal poinciana tissues; this was confirmed by the molecular, structural and morphological studies. Phylogenetic analyses of the () of from the UAE with reference specimens of Botryosphaeriaceae family validated the identity of the pathogen. To manage the disease, the chemical fungicides, Protifert, Cidely Top and Amistrar Top, significantly inhibited mycelial growth and reduced conidial numbers of in laboratory and greenhouse experiments. The described "apple bioassay" is an innovative approach that can be useful when performing fungicide treatment studies. Under field conditions, Cidely Top proved to be the most effective fungicide against among all tested treatments. Our data suggest that the causal agent of stem canker disease on royal poinciana in the UAE is .
在阿拉伯联合酋长国 (UAE)，王棕树遭受茎溃疡病的侵害。茎溃疡病的症状可表现为树枝和树叶干枯、树皮损伤、木质部组织变色、纵向木材坏死和广泛胶化。还观察到普遍的枯萎迹象，导致叶片完全落叶，最终树木在晚期死亡。真菌，DSM 109897，始终从患病的王棕树组织中回收；这通过分子、结构和形态学研究得到了证实。对来自阿联酋的 Botryosphaeriaceae 科的 () 的系统发育分析，参考了参考标本，验证了病原体的身份。为了管理这种疾病，化学杀菌剂 Protifert、Cidely Top 和 Amistrar Top 在实验室和温室实验中显著抑制了菌丝生长并减少了病菌的分生孢子数量。所描述的“苹果生物测定法”是一种创新方法，在进行杀菌剂处理研究时可能很有用。在田间条件下，Cidely Top 被证明是所有测试处理中防治王棕树茎溃疡病最有效的杀菌剂。我们的数据表明，导致阿联酋王棕树茎溃疡病的病原体是.
