Under ideal conditions, ornamental plants and crops are very resistant to plant diseases. But if following weather influences or wrong care damages occur, fungal spores, viruses or bacteria use the weakened plant for an infestation. In the house of small garden widely spread plant diseases, such as powdery mildew (Erysiphaceae), leaf blotch (Alternaria, Septoria) or grey mold (Botrytis cinerea), make the gardener’s life more difficult. Fruit plants are threatened by the feared bacterial disease fire blight (Erwinia amylovora) or the Monilia fruit rot (Monilia laxa). Vegetable plants fall victim to the Fusarium wilk (Fusarium) while trees and shrubs are haunted by the Verticillium wilk (Verticillium dahliae). There is organic help for many plant diseases or there are mechanical as well as bio-technical measures which are better than using a chemical option. Here you can find out the typical symptoms of plant diseases and discover effective combat methods in compliance with nature. All of this is added to useful advice for effective prevention measures.