for links to descriptions of virus diseases.
Soybean Viruses Not Detected In North Dakota in 2001-2002 Survey
Plant Pathologist, NDSU
Virus diseases of soybean have in recent years become a problem
in other soybean producing states in the North Central Region. Bean
Pod Mottle Virus (BPMV) which is vectored by the bean leaf beetle,
is a serious problem in food grade beans in other states. With the
introduction of the soybean aphid there is even greater concern
about virus diseases because the aphid can vector some soybean viruses
such as Soybean Mosaic Virus (SMV). BPMV and SMV are the two viruses
we are most concerned about in North Dakota. To benchmark the soybean
virus situation in North Dakota, we conducted a survey in 2001 and
2002 for virus diseases in 13 eastern soybean producing counties.
Over the two years, leaves were collected from 204 soybean fields
and tested for presence of BPMV and SMV. Also, 84 of the fields
from 2002 were tested for Alfalfa Mosaic Virus (AMV) and Tobacco
Streak Virus TSV), two other viruses found in soybeans. In addition,
food grade soybean seed was collected from 21 seed lots grown in
the Red River Valley in 2001, and seed coats were tested for presence
of BPMV and visually assessed for mottling.
None of the leaf samples from soybean fields were positive for
any of the virus diseases. Also, none of the seed samples were
positive for BPMV and there was no evidence of seed mottling. These
results indicate that at present, virus diseases are not a serious
problem in North Dakota. Most likely there are virus diseases here,
but probably at very low levels. However, virus disease problems
could appear at any time. With outbreaks of the soybean aphid occurring,
we may see some viruses moving in to the state and causing damage
to soybeans. Food grade soybean growers should always take note
of any virus like diseases in their fields, because these viruses
can not only reduce yields, but can cause serious seed quality problems
due to seed mottling. They should be especially diligent in controlling
the soybean aphid to reduce any potential virus infections.