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Schovankova J., Opatova H., 2011. Changes in phenols composition and activity of phenylalanine-ammonia lyase in apples after fungal infections. Hort. Sci. (Prague), 38: 1–10. Th e defensive reaction of apple cultivar Idared (Malus domestica Borkh.) was studied after inoculation with three diff erent pathogens (Penicillium expansum, Monilinia fructigena, and Gloeosporium spp.). Changes in phenolic content and activity of phenylalanine-ammonia lyase were determined after 7, 14, and 21 days after the inoculation. Th e signifi cant diff erences were discovered in the progress of rotting after the inoculation. Th e increase in phenols concentration and in phenylalanine-ammonia lyase activity varied in the place of fungal attack, in the tissues around rotten zone and in the healthy part. Th e response to the infection was diff erent in the fruit peel and fl esh. Very good correlation was found between the activity of phenylalanine-ammonia lyase and total phenol content (r = 0.76–0.98).