Role of cambio- and xylophagous insects in the process of decline of silver fir stands affected by industrial air pollution in Ojców National Park.
Observations in 1976-80 in southern Poland showed that the major species involved in the decline of dominant silver fir [Abies alba] in polluted stands were: Pissodes piceae, Pityokteines spinidens, P. curvidens, P. vorontzovi [P. vorontzowi], Pityophthorus pityographus and Siricidae. In the understorey, this role was played by Cryphalus piceae, Obrium brunneum, Clytus lama and P. pityographus. Xylophagous species such as Sirex juvencus and Serropalpus barbatus colonized during the early stages of decline, before infestation by the cambiophages. [With English tables and figures.]