APPLICATION OF SPECTRAL MEASUREMENTS TO THE ASSESSMENT OF POTATO PLANTS INFECTION BY PHYTOPHTHORAINFESTANS, THE CAUSAL AGENT OF POTATO LATE BLIGHT

摘要

Measurements of spectral reflectance from potato plants were carried out in the years 2000 and 2001 using the field radiometer CE 313 of Cimel Electronique Company, Field experiments permitted to perceive differences in the reflectance of electromagnetic radiation from potato plant cultivars Bekas and Mila as well as differences between the plants treated with fungicides providing the protection against Phytophthora infestans and the untreated plants. A differentiation of the values of vegetative indices between potato cultivars resulted from the unequal development rate of the cultivars and fiom their different susceptibility to Phytophthora infestans. The assessment of potato plants infection by the studied pathogen using spectral measurements agreed with the results of field inspection.