There are many kind diseases available for plant especially for vegetable and fruit vegetable such as tomato, potato, cucumber. The diseases can caused by bacteria, fungi or viruses. The kind of those diseases causes by certain microorganism as follows:
Bacterial Diseases
Bacterial cancer (Corynebacterium michiganense pv. michiganense)
Bacterial speck (Pseudomonas syringae pv. tomato)
Bacterial wilt (Ralstonia solanacearum)
Bacterial spot (Xanthomonas vesicatoria)
Fungal Diseases
Early blight (Alternaria solani/ A. porri)
Leaf mold (Fulvia fulva Syn. Cladosporium fulvum)
Leaf mold (Fusarium oxysporum f. lycopersici)
Powdery mildew (Leveillula taurica/Oidiopsis taurica)
Late blight (Phytophthora infestans)
Buckeye rot (Phytophthora spp.)
Black leaf mold (Pseudocercospora fuligena Syn. Cercospora fuligena)
Southern blight (Sclerotium rolfsii)
Septoria leaf spot (Septoria lycopersici)
Viral Diseases
Cucumber Mosaic Virus (CMV)
Potato Virus Y (PVY)
Tomato Leaf Curl Virus (TLCV)
Tomato Mosaic Virus (TMV)
Tomato Spotted Wilt Virus (TSWV)
Root-knot nematode (Meloidogyne spp.)