| Sumario: | The bark beetle Dendroctonus adjunctus Blandford, 1897, is a parasitic species of Pinus hartwegii forests and its populations are increasing, which implies a threat to this pine species. In this work, the spatial distribution of D. adjunctus in two natural protected areas of central Mexico was determined. 1,621 sampling units (UM) were established in 12,924 ha of pine forest in the Nevado de Toluca Flora and Fauna Protection Area (APFFNT) and 634 UM in 10,008 ha of Mount Tlaloc (MT). The dendrometric characteristics of all the trees ≥ 7.5 cm DBH were recorded, as well as the level of infestation of the host and the presence of parasitic plants. 19 % of the total sampled sites present bark beetle infestation, at altitudes of 3,600 to 3,900 m and diameter categories of 30 to 55 cm. The spatial distribution of bark beetles is influenced by exposure, altitude, slope and the simultaneous presence with dwarf mistletoe (Arceuthobium spp.).
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