Curtis Swift, Ph.D.
AMV was first described in California in 1931 as a mosaic virus of alfalfa. Since viruses are named for the first plant in which they are identified, the virus was named Alfalfa Mosic Virus (Hall). AMV is a pathogen of several vegetable crops causing up to 65% yield loss of peppers (Pernezny, et al.) while the strain that infects beans is reported to be of no economic importance whatsoever. Other crops reported to be susceptible to AMV include peas (Hagedorn, 1984), soybeans (Harman, et al. 1999), celery, celeriac, and other umbelliferous crops (Davis & Raid, 2002), head lettuce (Davis, et al., 1997), eggplant, and other dicots, many of which are weeds. This virus has one of the largest host ranges of any virus known to infect 600 plant species in 50 genera. Daughtrey et al. indicate AMV has been reported in greenhouse flower crops to include primrose, geraniums and hydrangea. They suggest this virus may be more widespread in flowers than reports would indicated.
The DNA samples were found to be 97%-99% related to Alfalfa Mosaic Virus. The strain of the virus was not identified in this process. Many strains of AMV cause necrotic local lesions, while other strains can result in yield loss, reduce winter survival, and an increase in infection by other pathogens. No data is available on the overall effect of AMV on lavender thus further research on this problem as it relates to lavender winter survival and yield is needed.
|Image 3: Pigweed with symptoms of AMV.|
Creating virus-free transplants and cuttings