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Soybean Vein Necrosis Virus Spreads Across U.S. Soybeans

Keep your eye on a new viral soybean disease called soybean
vein necrosis virus (SVNV). So far, little is known about this disease that
first surfaced in Tennessee in 2008. Still, it behooves you to watch for it
this year.

Since its 2008 debut, SVNV has spread through a widespread
geographic area that includes northern Indiana, Ontario, Iowa, Wisconsin,
Minnesota, and Illinois. The virus belongs to the genus


a group of plant viruses normally transmitted by thrips instead
of by seed or mechanical means.
Because SVNV was so recently found
in soybeans, virologists suspect it may have been recently introduced from
another host.

Agronomically, it’s difficult to assess SVNV’s damage.
Symptoms include vein yellowing, followed by blotches

“When we walked in fields in yield trials, it was on every
leaf at some level,” says Daren Mueller, Iowa State University Extension plant
pathologist.  “So, it likely causes
some yield damage.”

So far, no control recommendations exist. Initial studies
and observations
in Arkansas show symptoms vary
between varieties. This variation of symptomology may reveal genetic resistance
as a solution if infestations grow. 

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