ATR-FTIR imaging for the detection and mapping of Corinectria constricta in Pinus radiata wood in Chile

This study highlights the application of Fourier Transform Infrared (FTIR) spectroscopy for detecting and mapping the spatial distribution of Corinectria constricta in Pinus radiata , a key plantation species in Chilean forestry. P. radiata is highly vulnerable to flute canker disease caused by C. constricta , making early detection essential. Chemical imaging using the amide I band at 1692 cm⁻¹ served as a reliable spectral marker for differentiating the pathogen from host tissues. Structural imaging further confirmed and revealed a complex axial spread of the fungus within the stem, rather than a simple radial gradient. The FTIR-based approach was reproducible across multiple samples, demonstrating its potential as a rapid and non-destructive tool for the early detection and monitoring of fungal pathogens, thereby contributing to improved disease management strategies in forestry.