-Caveat Lector-
www.ars.usda.gov/is/pr/thelatest.htm.
----------
From: "ARS News Service" <[EMAIL PROTECTED]>
To: "ARS News List" <[EMAIL PROTECTED]>
Subject: Two New Corn Viruses Discovered
Date: Fri, Apr 20, 2001, 6:20 AM
STORY LEAD:
Two New Corn Viruses Discovered
___________________________________________
ARS News Service
Agricultural Research Service, USDA
April 20, 2001
Don Comis, (301) 504-1625, [EMAIL PROTECTED]
___________________________________________
Agricultural Research Service scientists and cooperators at Ohio State
University have discovered two new corn viruses, one in Georgia and
one in
Arizona. The Arizona virus is in a family of viruses previously known only
to attack broadleaf plants such as tomatoes and peppers, not grain
crops
like corn.
Peg Redinbaugh, an ARS plant molecular biologist at Wooster, Ohio,
and
colleagues named the Arizona virus "maize necrotic streak."
The team of scientists receives and identifies viruses in samples of
infected corn leaves from around the world. The service provides global
producers of corn and corn seed a first line of defense against new
diseases.
Maize necrotic streak is in the Tombusvirus family, which comprises
viruses
that tend to spread by soil rather than by insects, making them less
likely
to spread widely. Another reason this virus promises not to be spread
beyond Arizona is that it doesn't seem to spread from plant to plant. Its
symptoms first show as white- or cream-colored streaks on leaves. It
eventually kills the leaves, turning them papery and translucent, with
brown spots.
Lab tests indicate that a cornfield infected by the new virus would be
unlikely to yield any corn. That's why scientists have to take it
seriously. Other Tombusviruses, like tomato bushy stunt virus, cause
growers significant losses.
The Georgia virus, temporarily called the Georgia Unknown, is one of the
plant-infecting rhabdoviruses, a family of bullet-shaped viruses which
includes maize mosaic virus, a major corn disease in the tropics.
Viruses
in this family tend to be transmitted by any of a number of different
common aphids, thrips, mites and other insects.
The team is currently testing its living collection of insects to see which
of them transmit the Georgia Unknown, which may be limited to the
southern
United States.
ARS is the chief scientific research agency in the U.S. Department of
Agriculture.
___________________________________________
Scientific contact: Peg Redinbaugh, ARS Corn and Soybean Research
Unit,
Wooster, Ohio, phone (330) 263-3965, fax (330) 263-3841,
[EMAIL PROTECTED]
___________________________________________
--
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crime is anything that a group in power chooses to prohibit.
~~ Freda Adler
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