Abstract:Laboratory studies were conduced to determine the allelopathic potential of Lactarius hatsudake on the seedling growth of Oryza sativa and Echinoloa crusgalli. Their seeds were treated with different concentration ethanol-soluble extracts of Lactarius hatsudake. The root length and the shoot height of the plant were measured. RI (RI=1-C/T, when T≥C; RI=T/C-1, when T