Distribution of Lachnellula pini Along the Pollution Gradient in Lapland and Kola Peninsula and in Two Scots Pine Stands Damaged by Gremmeniella abietina in Eastern Lapland : 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. 224-230

15 Lit. Ang.

Bandaufführung

77419

Distribution of the canker pathogen, Lachnellula pini (Brunch.) Dennis, was studied, both along the pollution gradient from a nickel smelter in Kola peninsula to western Lapland and in two Scots pine (Pinus sylvestris L.) stands damaged by Gremmeniella abietina (Lagerb.) Morelet. The pathogen was detected in almost every study area along the gradient, while the average number of cankered pines per area ranged between 0 and 4.4%, and 0 and 11.4% in Kola peninsula and Lapland, respectively. In the two Scots pine stands slightly or severely damaged by Gremmeniella abietina Lachnellula pini. The occurrence of Lachnellula pini vorrelated negatively with the average monthly long-term temperature in June-September, but not with any other macroclimatic factors or modelled sulphur dioxide deposition. There was no significant correlation between the average numbered of cankered pines and content of heavy metals in the soil in two stands damaged by Gremmeniella abietina. This indicated that the studied metal play only a minor role in determining the distribution of Lachnellula pini. However, a significant correlation between the number of cankered pines and pH of the humus and proportion of the fine fractions in A horizon was detected in the severely damaged stand. Although Lachnellula pini was more common in stands damaged by Gremmeniella abietina than on average in the surrounding stand along the pollution gradient, and this indicated of a close relationship between these two pathogens, there was, however, no correlation between the occurrence of Lachnellula pini and Gremmeniella abietina among or within the studied areas except one. The results strongly indicate that Lachnellula pini is distributed randomly in its distribution area.