Osutost krošanja stabala jedan je od indikatora vitalnosti šumskoga drveća. Cilj je istraživanja bio analizirati osutost krošanja stabala obične jele i obične smreka s bioindikacijske plohe u Nacionalnom parku Plitvička jezera. Iz Upisnika Razine 1 Nacionalnoga programa motrenja oštećenosti šumskih ekosustava prikupljeni su podaci o osutosti krošanja stabala obične jele i obične smreke s bioindikacijske plohe u Nacionalnom parku Plitvička jezera. Vrijednosti samokalibriranoga Palmerova indeksa oštrine suhoće (scPDSI) prikupljene su s mrežne aplikacije KNMI Climate Explorer. S obzirom na osutost krošanja i mortalitet stabala obična jela i obična smreka dobre su vitalnosti na bioindikacijskoj plohi. Suša je utjecala na značajnu osutost krošanja stabala obične smreke, dok kod obične jele to nije bio slučaj. Potrebno je nastaviti promatranje vitalnosti šumskoga drveća te povećati broj ploha s motrenjem osutosti krošanja stabala, klime i ostalih ekoloških čimbenika u Nacionalnom parku.; Defoliation of trees is one of the indicators of the vitality of forest trees. The aim of the study was to analyse the crown defoliation of silver fir and common spruce trees from the bioindication plot in the Plitvice Lakes National Park. From the Level 1 Register of the National Forest Ecosystem Damage Monitoring Program, data were collected on the defoliation of silver fir and common spruce trees from the bioindication plot in the Plitvice Lakes National Park. Values of the self-calibrated Palmer Dryness Index (scPDSI) were collected from the KNMI Climate Explorer web application. Given the crown defoliation and the mortality of trees, common fir and spruce are of good vitality on the bioindication plot. Drought had a significant impact on moderate to severe defoliation of common spruce trees, while this was not the case with silver fir. It is necessary to continue monitoring the vitality of forest trees and increase the number of plots by monitoring the crown defoliation of trees, climate and other environmental factors in the area of the national park.