Early blight is a fungal disease of tomato (Lycopersicon esculentum Mill). It is an important disease of tomato which is caused by Alternaria solani (Ellis & Mart.) and Alternaria alternate f.sp. lycopersici. Tomato crop is damaged due to severe infection of A. solani every year in India.this book gives us great pleasure to present before our readers, researchers on "Early Blight Disease of Tomato" against the early blight disease of tomato because it cover a great collections of researches, due to this information, readers will be benefitted to find out the resistance source of tomato and the resistant material found in this study is useful in the tomato improvement programme, especially for early blight disease.