Gardner, D. E. . Unpublished: Infrared of "false color: photogrpahy. Mississippi NPS Science Center. Unpublished
ABSTRACT
One of the "cutting edge" trends in the field of plant pathology at the time was the use of infrared, or more correctly, "false color," photography to detect early disease development in crops with the goal of early control treatment. Studies using aerial photography to detect color changes indicating incipient disease, which supposedly were more apparent in false color than in natural green, were reported in a number of publications. I experimented with these techniques (i.e., combinations of various light filters and false color films) on the ground with forest diseases and a 35mm camera using false color slide film. Although this approach resulted in interesting photographs from an artistic standpoint, I did not become convinced that false color photography offered any real advantage in early detection of disease, or of presence of pathogenic fungi or bacteria in tissue. That is, I found that whatever could be observed in these photos in this regard I could also observe in conventional photographs, or by direct inspection of plant tissue. As well as naturally-infected plants, this work included mimosa (Albizia julibrissin) seedlings purposefully inoculated with the vascular wilt fungus Fusarium oxysporum f. sp. perniciosum, in comparison with healthy control seedlings).
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