Iowa Soybean Rust Web Page - Archive

Disclaimer

Wed, 17 May 2006 13:18:36 -0500

In an effort to help producers, scientists and crop professionals better understand this new pest, we have chosen to provide this archive. Please be aware that some of the content in these articles may now be out-of-date.

Sentinel plots are key

Thu, 31 Jan 2008 11:04:03 -0600

Published: 1/31/2008

The potential yield loss to soybeans in the U.S. from one year to the next because of Asian soybean rust continues to be unknown even though modeling programs continue to be developed from previous years information.

"In essence, we dodged a bullet this year, although we're still handling a loaded gun," said Merle Pierson, Department of Agriculture under secretary for research, education and economics, during the mid-December 2007 National Soybean Rust Symposium in Louisville.

Soybean rust was detected farther west and north than ever. The drought in the Southeast wasn't favorable for devastating yield loss, and rust spores that spread farther north than ever didn't arrive in time to affect yield.

Read the full story at
http://www.agprofessional.com/show_story.php?id=50282

Soybean rust: A year in review

Mon, 10 Dec 2007 13:32:45 -0600

Published: 12/10/2007

During the 2005 and 2006 growing seasons, soybean rust was not a threat for Iowa soybean growers. This year was a different story, as soybean rust was established fairly early in the season in Texas and Louisiana creating the potential for soybean rust to get to Iowa during the growing season. Thankfully, soybean rust was not found while soybean plants were in a vulnerable stage; however, soybean rust was found in a field in Dallas County, Iowa, on Tuesday, September 25, 2007. Since the initial find, soybean rust was confirmed in 13 additional counties in Iowa.

Read the full story at
http://www.ipm.iastate.edu/ipm/icm/2007/12-10/rust.html

ALERT: Soybean rust found in Kansas for first time ever

Fri, 21 Sep 2007 16:51:29 -0500

Published: 9/21/2007

or the first time ever, Asian soybean rust has been confirmed in Kansas -- in a sentinel plot in Montgomery County in southeast Kansas. Officials say several hundred thousand acres of late-planted soybeans could be at risk.

Kansas State University researchers and the Kansas Department of Agriculture have confirmed that a leaf sample from a soybean plant collected from a sentinel plot in Montgomery County has the disease.

Read the full story at
http://stopsoybeanrust.com/viewStory.asp?StoryID=1090

Sweets of Missouri gives rundown on Midwest soybean rust status

Thu, 30 Aug 2007 16:47:27 -0500

Published: 8/30/2007

Although the soybean rust situation can change quite quickly, in view of the rumors and false reports being circulated, a brief summary of the current status of soybean rust in the Midwest seems appropriate.

The USDA PIPE Website (www.sbrusa.net) remains a good site to use in checking on the status of soybean rust throughout the United States and in obtaining information on the distribution and management recommendations for various states. For most of us in Missouri, the states of interest earlier in the season were Louisiana and Texas and now Arkansas and Oklahoma are of extreme interest.

Read the full story at
http://stopsoybeanrust.com/viewStory.asp?StoryID=1088

Asian soybean rust found in Ghana on soybeans for first time

Mon, 20 Aug 2007 16:43:50 -0500

Published: 8/20/2007

Soybean rust was found in 11 soybean fields in Ghana last October -- the first report of rust caused by Phakopsora pachyrhizi in West Africa outside of Nigeria.

According to August issue of The American Phytopathological Society journal Plant Disease, during a disease survey in Ghana during October 2006, soybean leaves with rust symptoms were observed in 11 fields in the following districts: Kassena Nankana in the Upper East Region; East Gonja, Central Gonja, and Tolon-Kumbungu in the Northern Region; and Ejisu-Juabeng in the Ashanti Region. Disease incidence in these fields ranged from 50 to 100 percent, and disease severity ranged between 3 and 40 percent of the leaf area on infected plants.

Read the full story at
http://www.stopsoybeanrust.com/viewStory.asp?StoryID=1086

Summer scouting in soybean: Top dieback and other diseases

Tue, 7 Aug 2007 16:59:32 -0500

So far, rust is still found in the South with the most active areas in northeastern Texas, southwest Arkansas, and Oklahoma. These areas are in the storm pathway to Iowa, and soybean rust spores are easily carried to Iowa. Strong positive detections of soybean rust spores from rain traps in Iowa have been reported by a United Soybean Board-funded project led by USDA. Scouting has intensified in most soybean production regions, but no soybean rust has been found beyond Oklahoma. The risk of having an outbreak in Iowa remains low.

For the complete article, click here.

Soybean rust update and outlook

Thu, 26 Jul 2007 10:53:32 -0500

During the last two seasons, we projected that the risk of soybean rust (SBR) was no longer a concern when June ended. This season is different from last year because we received more rain early in the growing season, and the disease progressed much faster in the South than during the last two years. Below is an update on the movement of SBR in the two northward pathways and an outlook for the rest of the growing season.

For the complete article, click here.

ALERT: Soybean rust found in five north Texas counties near Dallas

Fri, 20 Jul 2007 17:50:52 -0500

Published: 7/20/2007

Asian soybean rust was found in low levels in commercial soybean fields in five Dallas-area counties in northern Texas. This adds to recent finds in commercial fields in Austin, Fort Bend and Jackson counties reported yesterday.

The new infected counties are Collin, Dallas, Ellis, Fannin and Hunt. This brings the total of Texas counties with soybean rust this year to 15, the highest count in the U.S. this year. Soybean rust has appeared in 42 counties and parishes in 2007, compared to only 25 in the U.S. and only one in Texas at this point last year.

Read the full story at
http://stopsoybeanrust.com/viewStory.asp?StoryID=1066

ALERT: Soybean rust hits two soybean sentinel plots in central Louisiana

Thu, 21 Jun 2007 09:13:08 -0500

Published: 6/21/2007

Louisiana has confirmed Asian soybean rust in soybean sentinel plots in Avoyelles and Rapides parishes in central Louisiana, about 80 miles north of the kudzu patches with rust on the coast.

Officials found the rust yesterday and confirmed it today. It is the first report of soybean rust on soybeans in the state this year. Growers of early-planted soybeans in the southern parishes are making fungicide applications to combat Asian soybean rust and late-season diseases, according to the state commentary.

Read the full story at
http://www.stopsoybeanrust.com/viewStory.asp?StoryID=1052

Iowa State Plant Pathologists Detect Crop Diseases from Satellites

Wed, 13 Jun 2007 09:16:07 -0500

Iowa State University researchers have developed a way to use satellite images to find Asian soybean rust.

“What we did on the ground 10 to 15 years ago, we can do now with satellites,” said Forrest Nutter, professor of plant pathology.

Using remote sensing, Global Positioning System and Geographical Information System technologies, scientists can measure the green leaf area of soybeans to detect and identify diseases down to the area of a square meter, about 1.2 square yards.

“Plant pathogens and pests impact the green leaf area index of crop canopies in different ways and those changes can be detected and quantified using remote sensing,” Nutter said.

Iowa Officials Find No Additional Evidence of Asian Soybean Rust; Federal Investigation Continues

Mon, 21 May 2007 08:19:08 -0500

DES MOINES, Iowa — How and why a single leaf infected with Asian soybean rust was found in Iowa in March are questions that continue to be addressed by federal investigators.

Officials with the Iowa Department of Agriculture and Land Stewardship (IDALS) and Iowa State University (ISU) have found no further evidence of Asian soybean rust in the field where the leaf was reported to have come or in neighboring fields.

“We did verify that one leaf submitted in a plant sample was infected with Asian soybean rust, but how it got into Iowa still needs to be determined,” said Bill Northey, Iowa Secretary of Agriculture. “After careful examination of the materials collected to date, we believe no Asian soybean rust infection occurred during the 2006 growing season in Iowa.”

Soybean rust update -- May 2007

Mon, 14 May 2007 08:19:35 -0500

The outbreak risk of rust diseases in the northern production regions has been associated with the level of overwintering in Gulf Coast regions. This relationship also may be applicable to soybean rust. This year's soybean rust was found overwintering in Georgia and four Gulf Coast states: Florida, Alabama, Louisiana, and Texas. In Florida, the level of disease from over-wintering areas has been reduced because of the dry spring conditions. In Texas, the field where infected soybean was found was plowed and planted with corn.

In Louisiana, however, plant pathologists report finding the disease on kudzu plants in a town west of New Orleans. The detection date was 53 days earlier than last year. Because Louisiana is in a route suitable for the northward spread of this disease as indicated by the spread of this disease last year, this finding has been considered significant. If an outbreak develops from this early occurrence before the end of June in Louisiana, the risk of soybean rust will be quite different from the last two years. In the last two growing seasons, the weather was dry and the disease moved slowly in the Mississippi Basin.

ALERT: Soybean rust found on kudzu in Louisiana; more expected

Fri, 11 May 2007 08:16:59 -0500

Published: 5/11/2007

The first Asian soybean rust of 2007 for Louisiana has been confirmed in a kudzu patch in New Iberia Parish, in south-central Louisiana. The find this early and in a place that could be a source of rust for the Midwest is of concern, officials said.

Clayton A. Hollier of Louisiana State University said in an advisory today that his associate, Rose Berggren, found the rust on May 8 in a patch that was infected last year. The official report on www.sbrusa.net was made today. The find joins 20 other reports of soybean rust in four other states so far this year.

Read the full story at
http://www.stopsoybeanrust.com/viewStory.asp?StoryID=1034