| viruses in maize and johnsongrass in southern ohio. | the two major u.s. maize viruses, maize dwarf mosaic virus (mdmv) and maize chlorotic dwarf virus (mcdv), emerged in southern ohio and surrounding regions in the 1960s and caused significant losses. planting resistant varieties and changing cultural practices has dramatically reduced virus impact in subsequent decades. current information on the distribution, diversity, and impact of known and potential u.s. maize disease-causing viruses is lacking. to assess the current reservoir of viruses pre ... | 2014 | 24918609 |