Lophodermium piceae and Zone Lines on Spruce Needles and in Culture : Shoot and Foliage Diseases in Forest Trees. Proceedings of a Joint Meeting of the Working Parties Canker and Shoot Blight of Conifers (S2.06.02) Foliage Diseases (S2.06.04)

Florenz

1995

S. 6-10

7 Lit. Ang.

Bandaufführung

13577

77370

Needles of Norway spruce (Picea abies (L.) Karst.) can show black zone lines, when they are infected by the ascomycetous endophyte (Lophodermium piceae (Fuckel) v. Hoehnel. The frequency of these zone lines was studied on needles from spruce stands of different density. Needles with black ascomata of Lophodermium piceae can be separated into several different groups. The anamorph stage is mostly situated close to the zone lines. The formation was also investigated in artificial cultures in relation to the behaviour of different isolates. Some of the strains, not all, form black structures in culture, which resemble black zone lines on the needles. Under the microscope they consist of melanized, roundish cell aggregates. In dual cultures between different Lophodermium piceae isolates and between Lophodermium piceae and other needle fungi we could observe that the formation of zone lines is probably an antagonistic reaction against other strains of the same species or against other species. But this ability can be missing in some Lophodermium piceae isolates. As a result of our studies one can state that this physio- morphological reaction is a characteristic trait of Lophodermium piceae in vivo as well as in vitro.