Definition
A plant virus is a virus that infects plants, causing a variety of diseases that can affect crop yields and plant health. They are obligate parasites, meaning they rely entirely on the plant cell to replicate. Think of them as tiny saboteurs disrupting plant processes. These viruses spread through various means, including insects, seeds, and contaminated tools. They cause symptoms ranging from stunted growth and leaf discoloration to fruit deformities. Managing plant viruses is crucial for agriculture and food security.