Phytopathogenic fungi belong to the living causers of the disease Phytopathogenic fungi cause 75% of plant diseases, and the fungus can penetrate into plants in three ways: penetrating through the natural openings of the plant, penetrating through the resulting mechanical damage to the plant tissue or directly penetrating through untreated plant tissue. Phytopathogenic fungi are classified into a group of parasites because their diet specializes in taking food from a hosts and they are making damage to them while they are doing that. They can be compulsory and optional parasites. In addition to domicile needs, phytopathogenic fungi can also be divided according to the parasitic site. They evolved through evolution through many different ways of spreading, so they can spread through wind, vectorial organisms, soil treatment tools and in many other ways. This paper deals with several genera of phytopathogenic fungi that are severely widespread. These are the type of Cercospora that cause the appearance of clotting on the leaves, the Coniothyrium genus that causes the appearance of necrosis on the eucalyptus buds, the Erysiphe genus, which causes the appearance of leech and many other genera and species. Apart from the aforementioned breeds, most common diseases affecting agricultural and fruit crops are also treated, such as potato flakes, grape vines, leaf cuttings and apple fruits, peach leaf curls, and brown and yellow wheat rust.