Evaluation of male generative sphere state of Crimean pine in different ecological conditions of the city of Voronezh

The results of three-year phenological observations and study of the pollen viability of Crimean pine which grows in contrasting environmental conditions of Voronezh region are presented. The terms of the phenophases onset of the male generative sphere development and the corresponding sums of effective temperatures are given. The viability of pollen of Crimean pine trees in depending on the places of growth was determined. The data we have received can indicate that this type of coniferous introduced species in the forest-steppe has a high quality of pollen and a level of adaptive potential.