Okuva 1892 omusajja Dmitri Ivanovsky bwe yawandiika ng’annyonnyola ku kawuka akaali kakosa ekirime kya taaba okutuuka mu 1898, Martinus Beijerinck we yazuulira akawuka ka vayiraasi akayitibwa mosaic virus, ebika bya vayiraasi nga 5,000 bizze bivumbulwa ne binnyonnyolwa. Obuwuka bwa vayiraasi busangibwa kumpi mu buli mbeera ebaamu obuluma ku nsi (ecosystem).