Remote sensing of vegetation and plants under stress comprises various
nondestructive methods of spectral analysis from distances ranging fr
om satellites to ground-based platforms. By using multispectral images
we can continue down to the macroscopic? microscopic and ultramicrosc
opic levels in nondestructive analyses of plants, plant diseases and p
athogens. Techniques and methods of multispectral radiometry, photogra
phy, videography, IR thermography, multispectral image analysis, and N
MR are reviewed in this paper with examples of applications in phytopa
thology and phytopathometry. Although we cannot yet identify specific
diseases or stresses by remote sensing, we are able to detect and quan
tify their intensity. This usually facilitates, rationalizes, and incr
eases the accuracy of research in phytopathology, and makes the resear
ch more interesting acid valuable.