Report points out problems with Roundup Ready soybeans

(May 3, 2001 -- Cropchoice news) -- Contrary to the promises of Monsanto,
farmers are applying more herbicides to Roundup Ready soybean plants and
reaping lower yields from them compared to conventional varieties, according
to a new report by Dr. Charles Benbrook of the Northwest Science and
Environmental Policy Center in Sandpoint, Idaho.

The study, "Troubled Times Amid Commercial Success for Roundup Ready
Soybeans: Glyphosate Efficacy is Slipping and Unstable Transgene Expression
Erodes Plant Defenses and Yields," available at
http://www.biotech-info.net/troubledtimes.html, uses recent USDA and
university research to update the Center's 1999 report on the same subject.

Many farmers have told Cropchoice about the extra herbicides and lower
yields that go along with growing Monsanto's herbicide-resistant beans.
Despite this, they're planting more  Roundup Ready soybeans -- 60 percent of
this year's crop -- because the technology makes weed management relatively
easy.

But what farmers may not want to hear, and what this study reveals, is that
relying on Roundup to kill weeds in Roundup Ready soybean fields has led to
their becoming herbicide resistant.

Increased herbicide use One must look at the amount of herbicide growers
apply per acre of soybeans to see that Monsanto's transgenic varieties
require more applications, according to the executive summary of the report.

"More than a dozen soybean herbicides are applied at an average rate of less
than .1 pound active ingredient per acre. Roundup, on the other hand, is
usually applied on soybeans at about .75 pound per acre in a single spray
and most acres are now treated more than once," Benbrook writes. "...Total
herbicide use on RR soybeans in 1998 was 30  percent or more greater on
average than on conventional varieties in six states, including Iowa where
about one sixth of the nation's soybeans are grown. RR soybean herbicide use
was 10 percent or more greater in three more states. Use on RR soybeans was
modestly lower in five states."

Benbrook predicts that farmers will apply about .5 pounds more herbicide
(active ingredient) to the average acre of Roundup Ready beans than they
will to conventional varieties in 2001. "As a result over 20 million more
pounds of herbicides will be applied this crop year."

Yield drag in Roundup Ready beans The report highlights research linking the
5 to 10 percent yield drag in Roundup Ready soybeans to the interaction of
their genetics with environmental factors, including the application of
Roundup.

Herbicide resistance in weeds "There are two major factors on the plus side
of RR soybean trade-offs -- weed management is simplified and soybean crop
injury is avoided. But troubled times lie ahead   for RR soybeans because
the efficacy of glyphosate is clearly slipping in managing weeds   and
because unanticipated yield penalties are surfacing in some RR fields...,"
Benbrook writes.

To see the full report, go to www.biotech-info.net/troubledtimes.html
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