A database of plant diseases reported in Japan and a Web-based data-retrieval system to search for information stored in the database have been developed. The retrieval system is linked with the database on microorganism genetic resources registered in the Genebank Project of the National Institute of Agrobiological Sciences (the NIAS Genebank), which provides access to detailed genetic information on strains of these microorganisms. The NIAS Genebank manages the registration of so-called “passport” data for these genetic resources and controls their storage to make samples available to researchers worldwide. Data management software has been developed to register the receipt, storage, testing, and multiplication of these genetic resources. Search software has also been developed to seek suitable genetic resources based on several search criteria to facilitate their distribution from the stocks stored in the NIAS Genebank. DNA sequence data for the D1/D2, 18S, and internally transcribed spacer ITS (ITS1-5.8S-ITS2) regions of rDNA and for the coding region of the β-tubulin gene for many of the conserved microorganisms can be accessed from the NIAS Genebank Web site. The database on Japanese plant diseases and the NIAS Genebank search system are expected to become increasingly useful tools for research and education related to microorganisms and their genetic data, as well as for improving plant protection and food security.