Identification of Vegetation Indices of CTV-infected Trees by the Use of Spectroradiometer: Preliminary Results
In Italy, the monitoring of Citrus tristeza virus, the most destructive pathogen in Citrus spp. , is annually conducted in the Southern Italian region of Apulia where the virus outbreaks have been reported over the last 5 years. Therefore, it is necessary to promptly identify suspected infected trees on a large scale by the use of satellite imaging. To this aim, the vegetation indices of CTVinfected and CTV-negative citrus trees were preliminarily investigated in order to provide the tree spectral signature detected in the field by the Hand Held Post Dispersive Spectrometer. The study was carried out in 2 selected commercial groves (Precoce di Massafra Clementine and Navelina orange) located in the CTV foci area, both showing a high CTV infection rate. The trees were previously tested by serological (DTBIA) and molecular (PCR) tools to assess the virus presence. The preliminary results highlighted a difference in the spectral signatures of CTV-infected and CTV-free trees, allowing a discrimination of the canopy stress level based on the vegetation indices properly estimated. Further variation was recorded according to the species. In the light of these results, the use of vegetation indices of citrus trees could be suggested in combination with the satellite imaging.
Citrus CTV Spectroradiometer Spectral signatures PC A Vegetation indices
M. R. Ikhrichi S. Gualano F. Santoro R. Milano A. M. DOnghia M. G. Angelini D. Costantino
Centre International de Hautes Etudes Agronomiques Metliterraneennes ( CIHEAM)/Mediterranean Agronom Department of Environmental Engineering and Sustainable Development, Technical University of Bari, V
国际会议
11th International Citrus Congress(第11届国际柑橘大会)
武汉
英文
1124-1128
2008-10-01（万方平台首次上网日期，不代表论文的发表时间）