Aim of the study – to evaluate the phenotypic variability of the wild apple and the wild pear in the aspect of the species’ natural regeneration and survival. The research sites have been chosen in the typical forest habitats of the species. The data on the mature trees were collected in the forests of south-western and central Lithuania in 1997-2005. The data on taxonomic identity of self-spreading pears were obtained after the evaluation of clone collection at the Lithuanian Institute of Horticulture. SAS and STATISTICA procedures were used for mathematical-statistical analysis of the data. With an aim to determine whether the wild apple may be able to produce viable apomictic seeds, seven progenies have been selected for peroxidase analysis according to the evaluation results of different female-trees at their natural habitats. The results of K-means clustering of pear clones were the sampling basis for peroxidase analysis of self-spreading pears. The novelty of the study is presented by: the evaluation of the phenotypic differences among trees at their natural habitats within the wild apple; the determination of the critical traits of the wild apple indicative for vigorousness of tree growth and survival; the determination of wild genotypes of the apple and the pear with the aid of peroxidase analysis for the first time in Lithuania; the definition of traits for taxonomic identification of self-spreading pears; the conceptualization of conservation and promotion of the... [to full text]