The Encyclopedia's Diseases page lists the possible diseases that may affect a plant. By default, the disease list contains the diseases that can affect the currently selected plant. If you want to view a comprehensive list of diseases for all plants, click All in the bottom right corner of the page.
When you select a disease in the disease list, you will see a picture of the disease, details of its symptoms in the Symptoms windows, and care information in the Control window.
If you want to search in reverse to find all plants affected by a specific disease, click the Filter button at the bottom of the page. This opens the main Encyclopedia page. To restore your plant list, return to the Diseases page and click the All button.