This document provides an overview of plant virology. It begins with the importance of studying plant diseases due to agriculture's role in India's economy. It then discusses the history of plant virus discovery from early observations in Japanese poems to advances in purification and structure determination. The document classifies plant viruses based on genome type and includes examples of families for each type. It describes several modes of plant virus transmission and associated vectors. Common viral symptoms at both macroscopic and cellular levels are outlined. The stages of the viral lifecycle and methods for controlling viral diseases through removal of infection sources, vector control, and agronomic techniques are summarized. Finally, potential uses of plant viruses in genetic engineering and vaccine production are mentioned.