EN
The aim of the study was to assess the effect of the application of Sincocin AL and inoculation with the fungi Hebeloma crustuliniforme or Laccaria bicolor on the growth and level of mycorrhizal colonization of Scots pine seedlings. Sincocin had no effect on the development of biometric parameters of pine seedlings inoculated with L. bicolor, it limited the growth of non−inoculated seedlings and stimulated the growth of the seedlings from the variant with H. crustuliniforme. Sincocin did not cause changes in the proportion of the mycorrhizae formed by H. crustuliniforme or L. bicolor, and affected in different ways (stimulation, inhibition, no effect) the spontaneous formation of mycorrhizae.