Studies concerning mosaic diseases of plants.

During recent years tbe increasing economic importance of the mosaic and other virus diseases of our crop plants has given a great impetus to the study of these obscure troubles. As a result, the known mosaics have been increased £rom the single one affecting tobacco to numerous mosaics of other Solanaceae, Leguminoseae and Gramineae, with scattered cases in twenty or more additional families of both Monoctotyledons end Dicotyledons. Current literature is replete with reports of mosaic diseases on new plants, either wild or cultivated, and studies concerning plant virus diseases are daily entering widely divergent channels of research. [...