EN
Registration of the only preparation based on a microorganism for biological control of forest tree root diseases expires on December 31, 2010. The biopreparation, named PG (from the biological control agent Phlebiopsis gigantea), is a result of a long and successful story of biological control in forestry. Almost 30 years ago State Forest Authority in Poland implemented the biopreparation for an obligatory treatment of Scots pine stumps on postagricultural lands. Up to now over 40 millions of stumps were treated in the State Forest, on 30 000 ha per year, on average. Research work on biological control of tree seedlings damping-off, though extensive and promising, have not resulted in registration of a biopreparation for use in Poland. The only biopreparation left is now a biopreparation for mycorrhiza inoculation of tree seedlings, which controls also root diseases caused by soil-borne pathogens. It was implemented in 1998 by State Forest Authority management. The preparation is based on a mycorrhizal fungus Hebeloma crustuliniforme. Every year ca 15 millions seedlings are treated.