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Technical Note: Response of ratio vegetation indices to foot rot-infected citrus trees

Ratio vegetation indices were evaluated for differentiating foot rot-infected (Phytophthora parasitica Dast) from noninfected citrus trees (Citrus spp.). At two sites, field spectral measurements of infected and noninfected trees were obtained with a hand-held spectroradiometer. The following bands were assessed for developing the ratios: blue (B, 450–520 nm), green (G, 520–600 nm), red (R, 630–690 nm), near-infrared (NIR, 760–900 nm) and mid-infrared (MIR1, 1550–1750 nm; MIR2, 2080–2350 nm). For both sites, means of infected and noninfected trees were significantly different (t-test; p<0.05) for NIR/B, NIR/R and NIR/MIR1 ratios. Percentage difference values indicated the NIR/R ratio was most responsive to the disease. A relative index value was established for separating infected from noninfected trees. Findings demonstrated that ratio vegetation indices have high potential for distinguishing foot rot-infected from noninfected citrus trees.