Applicability of remote sensing to detect virus infection of wheat was studied under field conditions. The experiments were carried in a wheat variety experimental field in Szeged, Hungary, continuously exposed to natural infection by viruses from sowing to harvest. Plants were evaluated for virus infections by visual inspection and aerial photography, and viral contents were quantitated by DAS-ELISA of randomly taken samples. Analysis of the results showed a direct relationship between the extent of yellowing of the leaves and the rate of Wheat dwarf bigemovirus (WDV) and Barley yellow dwarf luteovinis (BYDV) infection, but not with that of other wheat pathogenic viruses, such as Wheat streak mosaic tritimovirus (WSMV), Brome mosaic bromovirus (BMV), and Barley stripe mosaic hordeivirus (BSMV).