Department of Biology, 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. 2019 Feb 20;20(4):923. doi: 10.3390/ijms20040923.
Date palm orchards suffer from serious diseases, including sudden decline syndrome (SDS). External symptoms were characterized by whitening on one side of the rachis, progressing from the base to the apex of the leaf until the whole leaf dies; while the internal disease symptoms included reddish roots and highly colored vascular bundles causing wilting and death of the tree. Although three spp. (, and ) were isolated from diseased root samples, the fungal pathogen was associated with SDS on date palm in the United Arab Emirates (UAE). spp. were identified based on their cultural and morphological characteristics. The internal transcribed spacer regions and large subunit of the ribosomal RNA (ITS/LSU rRNA) gene complex of the pathogens was further sequenced. Pathogenicity assays and disease severity indices confirm the main causal agent of SDS on date palm in the UAE is . Application of Cidely Top (difenoconazole and cyflufenamid) significantly inhibited the fungal mycelial growth in vitro and reduced SDS development on date palm seedlings pre-inoculated with under greenhouse conditions. This is the first report confirming that the chemical fungicide Cidely Top is strongly effective against SDS on date palm.
枣椰树果园遭受严重病害，包括突然萎蔫综合征（SDS）。外部症状表现为叶轴一侧变白，从叶基向叶尖发展，直至整片叶子死亡；而内部病害症状包括根变红和高度着色的维管束，导致树木枯萎和死亡。尽管从患病根样本中分离出了三种 spp.（、和 ），但真菌病原体 与阿联酋（UAE）枣椰树 SDS 有关。根据其培养和形态特征鉴定出 spp.。进一步对病原体的内部转录间隔区和核糖体 RNA（ITS/LSU rRNA）基因复合物的大亚基进行了测序。致病性测定和疾病严重程度指数证实，阿联酋枣椰树 SDS 的主要致病因子是 。在温室条件下，预先用 接种枣椰树苗后，施用 Cidely Top（咯菌腈和氟吡菌酰胺）可显著抑制真菌菌丝生长并减少 SDS 的发展。这是首次确认化学杀菌剂 Cidely Top 对枣椰树 SDS 具有强烈防治效果的报告。
