From the aspects of plant pathology, the stands of Austrian pine in Hungary had been considered as the most stable man-made plant formations till the mid 1980s. Damages caused mainly by Heterobasidion annosum (Fr.) Bref. and wood-beetle locally can be well identified in the stands. The first notable necrosis of needles and shoots caused by various damaging agents have emerged about fifteen years ago. At first, the species Sphaeropsis sapinea Dyko & Sutton, then, a few years later, the Mycosphaerella pini E. Rostrup (its anamorph Dothistroma septospora/Dorog./Morlet), and Sclerophoma pithyophila (Corda) Höhn caused considerable damages at certain locations. During the last 2-3 years Cenangium ferruginosum Fr. ex Fr. has also spread and dispersed in stands of Austrian pines of various age in national scale.