Disclosed are: a seed having resistance to diseases； and a method for inoculating a microorganism into a seed for the purpose of controlling diseases. As a result of intensive studies, it is found that diseases of a crop can be controlled by inoculating a biofilm of a Bacillus bacterium into a seed of the crop.Specifically disclosed are； a seed inoculated with a biofilm of a Bacillus bacterium and a method for inoculating a biofilm of a Bacillus bacterium into a seed.
