Remote Detection of Biological Stresses in Plants with Infrared Thermometry

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Science  10 Aug 1979:
Vol. 205, Issue 4406, pp. 585-587
DOI: 10.1126/science.205.4406.585


Green leaves of mature sugar beets infected with Pythium aphanidermatum and cotton infected with Phymatotrichum omnivorum had midday radiant leaf temperatures 3° to 5° warmer than adjacent plants with no sign of disease. The temperature difference persisted under varying conditions of soil moisture and could be used to detect biological stress imposed by these soilborne root-rotting fungi.