Arango M, Martínez G, Torres G
Pests and Diseases Program, Colombian Oil Palm Research Centre, Cenipalma. Bogota, Colombia.
Plant Dis. 2016 Aug;100(8):1559-1563. doi: 10.1094/PDIS-12-15-1473-RE. Epub 2016 May 25.
Basal stem rot, one of the most important diseases of oil palm in Southeast Asia, has also been identified in Colombia. The increase in disease incidence in the last decade has attracted the attention of producers and researchers. In the search for a procedure that allows for the early identification of diseased palm, Cenipalma evaluated the use of electrical impedance tomography to identify the different stages of development of basal stem rot. The tomograms were compared with transversal sections of healthy and diseased oil palm trees. Following Cenipalma's preliminary studies on early diagnosis of basal stem rot with tomography, the present study improved upon the technique by analyzing the tomograms of 209 diseased palm trees (confirmed by symptomatology), 346 asymptomatic palm trees, and 132 healthy palm trees. The minimum and maximum electric impedance values as well as the ratio between these values was recorded. The range of 1 to 95 Ω was used to represent the internal damage. The ratios averaged 5.1 for diseased, 1.9 for asymptomatic, and 1.5 for healthy palm trees. With the range and the ratio criteria established, it was possible to identify the disease in 100% of asymptomatic sampled palm trees. This study demonstrated that electrical impedance tomography is a powerful tool for early detection of basal stem rot, which can be used to establish an early disease management program.
基干腐病是东南亚油棕最重要的病害之一，在哥伦比亚也有发现。过去十年间发病率的上升引起了生产者和研究人员的关注。为寻找一种能够早期识别患病油棕的方法，棕榈研究中心（Cenipalma）评估了利用电阻抗断层扫描技术来识别基干腐病不同发展阶段的可行性。将断层扫描图像与健康和患病油棕树的横切面进行了比较。在棕榈研究中心关于利用断层扫描技术早期诊断基干腐病的初步研究基础上，本研究对该技术进行了改进，分析了209棵患病油棕树（经症状学确诊）、346棵无症状油棕树和132棵健康油棕树的断层扫描图像。记录了最小和最大电阻抗值以及这些值之间的比率。用1至95Ω的范围来表示内部损伤情况。患病油棕树的比率平均为5.1，无症状油棕树为1.9，健康油棕树为1.5。根据所确定的范围和比率标准，能够在100%的无症状抽样油棕树中识别出该病。本研究表明，电阻抗断层扫描技术是早期检测基干腐病的有力工具，可用于制定早期病害管理方案。
