Ukrainian Journal of Forest and Wood Science

Study of population characteristics and distribution of stem pests on the trees of Ulmus glabra Huds. and the dynamics of their reproduction and distribution is important, since the weakening of plantings by harmful insects and pathogens creates favorable conditions for their mass reproduction, and the measures of struggle are rather complex and little studied. Population characteristics and peculiarities of the distribution of stem pests of ilm breeds within the region indicate the occurrence of the centers of bark beetles to locations of weakened plantations. The density of the settlement, the production of young beetles and the mean values of the length of the uterus are established. The main signs of the degradation of the irrigated plantations as a result of the proliferation of stem pests with further damage to the Dutch disease are the intensive nature of the drying of the tree-stands, the spread of drying from the south to the north, that is, the trees that are primeval in the most lighted birches, as well as the trees adjacent to the existing centers of drying.

production of young beetles, density of settlement, Graphium ulmi, center of stem pests