WEST LAFAYETTE, Ind. — A new publication funded by the North
Central Soybean Research Program and coauthored by a Purdue Extension plant
pathologist will raise awareness of soybean vein necrosis virus.
The publication is part of the program’s multi-state Soybean
Disease Management Series, which aims to help soybean farmers identify and
economically manage diseases to minimize yield loss.
Soybean vein necrosis virus is fairly new to the
north-central U.S. The publication provides information to soybean growers about
what the disease is, symptoms, vectors, laboratory detection, yield loss,
economic impact and management.
“We don’t know a lot about the virus right now because it is
very new, but we are doing research to try to understand how it could impact
yield,” Kiersten Wise said. “We want to make sure growers know how to identify
the virus in their fields so they aren’t applying ineffective pesticides to try
to manage the disease.”
The virus is transmitted from plant to plant by tiny, winged
insects called thrips. Adult thrips, about one-sixteenth of an inch long, have
yellow bodies, dark thoraxes and two black crossbands on their forewings. They
feed on plant juices, primarily on the undersides of leaves and pollen when
flowers are present.
Wise said that in Indiana the virus is widespread.
“We usually see it appear first in the southern part of the
state, but by the end of the season, it can almost be in every field,” she
Virus symptoms begin with vein clearing followed by
chlorosis, which appears as light green to yellow blotchy patches near the main
vein of the leaf. Leaves might appear scorched, and affected leaf tissue might
die during late stages of infection.
Researchers will continue to monitor the disease and assess
potential impact in an effort to determine the best management options. Future
recommendations will be developed as researchers learn more.
Soybean growers can download Soybean Disease Management: Soybean Vein Necrosis
Virus for free at www.extension.purdue.edu/extmedia/BP/BP-186.pdf.