The electron-microscopic proof of tobacco necrosis virus in hop plant

Following a previous biological and serological evidence of tobacco necrosis virus by means of an electron microscope, isometric virus particles of an average size of 26 ± 0.5 nm were found, in ultrathin sections prepared from the tissue of sprouting buds of underground stalks and from that of runners butts with symptoms of mosaic line pattern, as well as from the tissue of the indicator plantChenopodium quinoa.