One of the main sources of income is agriculture. Many peasants in developing nations like India find work in agriculture. Many crops are grown in India's agriculture, which provides a living for about 70% of the country's people, according to a study. Indian farmers primarily employ manual planting due to outdated technologies. What crops will grow on a farmer's property is unknown. Exotic plant diseases that harm plants through their leaves have an impact on agricultural productivity and decrease in profitability. Moreover, it lowers the level and quality of agricultural output. For accelerated plant development and increased agricultural yields, leaves are crucial. Farmers and academics have had trouble detecting illnesses on plant leaves. Nowadays, farmers apply pesticides on plants that may have a negative impact on human health and economy. These plant diseases need to be found quickly, using a variety of ways. A variety of plant diseases are covered in this article, as well as cutting-edge methods for finding them.