From the very beginning of organised agricultural cultivation viruses have been identified as the limiting factor in the plant growth or in the yield and quality of plant products. Investigations in different aspects of plant virology have advanced all oyer the world. One aspect ‘Host and non-host of plant viruses’ of such studies have been dealt with in the present collection. This will help understand the viruses in a better way. It is hoped that this study of host and non-host of plant viruses of the renowned virologists will contribute to a better knowledge of correlations between viruses and plants and as such would prove useful to researchers, teachers and all those interested in virology. It will specially enable the virologists to review the work being done in the above field.