B.SC. PART[I] FIRST YEAR BOTONY LESSION—2 Viruses, Viroids and Prions VIRUSES The name virus (Latin virus=venom of poisonous fluid) was given by Pasteur to the causative agents of infectious diseases. Adolph Mayer (1885), a Dutch scientist, and D. J. Ivanowsky (1892), a Russian scientist, recognized...