| sequence diversity of the nucleoprotein gene of iris yellow spot virus (genus tospovirus, family bunyaviridae) isolates from the western region of the united states. | iris yellow spot virus (iysv), a tentative virus species in the genus tospovirus and family bunyaviridae, is considered a rapidly emerging threat to onion production in the western united states (us). the present study was undertaken to determine the sequence diversity of iysv isolates from infected onion plants grown in california, colorado, idaho, oregon, utah and washington. using primers derived from the small rna of iysv, the complete sequence of the nucleoprotein (np) gene of each isolate ... | 2006 | 16320007 |