Viral diseases in plants pose a serious threat to the plant production. Plant viruses are among the major factors that affect productivity and cause vast economic losses. Across the globe plant viruses persist to be a major threat to vegetation of fruits, vegetables, ornamental crops, etc. and their prevention and control are the major areas of concern. Over the past century, efforts have been put to understand the underlying mechanism of defense against plant viruses and reasons for this intercellular invasion. Resistance to plant viruses can be offered by several means such as conventional breeding methods, chemotherapy, thermotherapy and plant biotechnological interventions (plant tissue culture technology and production of transgenic plants). The present work is an attempt to understand the biology and mechanism of plant viral infections, the dangers posed by them and all possible alternatives for prevention.
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