Greensboro, North Carolina
May 25, 2006
Source of this article: Soybean
Rust Update from Syngenta
A recent, unexpected
outbreak of Asian soybean rust in Mexico demonstrates the
destructive nature of the disease. Experts believe the
current risk for rust in east Texas remains low, but they
encourage extensive scouting of sentinel fields and
commercial fields that are in the R1 growth stage.
A bout of Asian soybean rust
left more than 20 soybean seed growers near Tampico, Mexico
unexpectedly dealing with the disease. About 320 hectares, or
650 acres, were affected, resulting in defoliation and potential
large yield losses.
ASR infections began in January
but became increasingly noticeable in March and April. “It
caught these particular growers by surprise, and it hit them
pretty hard,” said Dr. Marty Wiglesworth, Syngenta technical
brand manager, fungicides.
Seed beans are generally
harvested at the end of April into early May, so the majority of
the affected acres should be out of the ground. Mexican growers
will begin planting more soybeans closer to the Texas border in
late May. According to Wiglesworth, the time gap between
harvesting the seed beans and planting additional soybeans may
be good news for U.S. soybean growers.
“We cannot foresee whether the
impact on the U.S. crop will be minimal. We don’t know at this
point,” Wiglesworth said. “It depends on whether there are
nearby patches of volunteer soybeans or kudzu for ASR to live on
until the newly planted Mexican crop becomes susceptible at R1.
Scouting fields is the prudent thing to do, and the universities
and Syngenta are actively engaged in scouting activities.”
Potentially, Wiglesworth said
ASR could be equated to the wheat rust that comes yearly out of
Mexico and Texas into the Midwest. “If ASR establishes itself on
a regular basis in Mexico, one possibility is that it could
follow a very similar pathway as wheat rust. Overwintering ASR
present in Florida and Georgia has a harder time moving directly
into the Midwest unless there are unusual weather patterns, but
Mexico could serve as a more consistent source into the Midwest.
At this time, however, experts believe the current risk for rust
in east Texas is low.”
There are currently no
effective fungicides labeled for use in Mexico for Asian Soybean
Rust control, although agrichemical companies, including
Syngenta, are currently pursuing emergency exemptions for rust
More information about soybean
rust is available from your local retailer, your local Syngenta
sales representative, by calling 888-SOYRUST or at
For more information, visit
Syngenta Crop Protection, Inc., Greensboro, NC 27409.
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