Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:


Plant pathologists offer soybean rust identification and management tips


With the confirmation that soybean rust has been detected in the U.S., plant pathologists with The American Phytopathological Society (APS) are offering insight into the management and identification of this disease.

According to Doug Jardine, director of the APS Office of Public Affairs and Education and plant pathology professor at Kansas State University, plant pathologists from government agencies, industry, and universities have been working together to prepare for the appearance of soybean rust in the U.S. for the past two years. "Through this collaboration, we have been able to share research information from around the world and updates on control methods, such as fungicides sprays and predictive weather models," said Jardine. Plant pathologists have also worked with local extension agents and growers to educate them on disease identification, potential yield loss, and costs associated with managing the disease.

Plant pathologists do not expect soybean rust to affect all soybean growing areas next year. "Growers should not assume that every soybean field will be in danger," said Jardine. "Based on our models, the disease is expected to be more severe in the Southeast, Lower Mississippi-Delta region, and the Appalachians and less severe in the western Great Plains and northern Great Lakes area," he said. Soybean rust is caused by two fungal species--Phakopsora pachyrhizi and Phakopsora meibomiae. The more aggressive species, Phakopsora pachyrhizi, is the type that has been detected in the U.S.

Soybean rust primarily affects plant leaves and creates two types of lesions--tan and red lesions with tan being the most severe. The appearance of brown spots on soybean leaves is the first sign of infection. When the leaf is turned over, a plant infected with soybean rust will have raised pustules with rust spores inside. As rust severity increases, premature defoliation and early maturation of plants is common. Soybean rust can go from a few pustules in a field to full field defoliation in a matter of about two weeks.

The main method of controlling soybean rust is through early detection and application of fungicides, said Jardine. "If the disease goes undetected for too long, the fungicides will not have much of an effect," he said. "Growers must put fungicides on as a preventive measure or at the earliest sign of infection," said Jardine. Information on available fungicides, rates, and time of application can be obtained through local Cooperative Extension Service offices. Fungicide companies and the Environmental Protection Agency (EPA) are working closely with plant pathologists and growers to provide appropriate products in adequate supplies to use next year as needed, said Jardine.

Plant pathologists have screened all available commercial varieties of soybeans for resistance to soybean rust, but none have proven to be resistant. There are some varieties that are more susceptible to the disease and it will be important to identify these early on to reduce the impact of the disease, said Jardine.

Growers that suspect that they may have soybean rust are encouraged to collect samples and send them to their local state land grant university diagnostic labs for evaluation. The diagnostic labs will be receiving additional soybean rust identification training over the winter, said Jardine. A list of state land grant universities is available at

Amy Steigman | EurekAlert!
Further information:

More articles from Agricultural and Forestry Science:

nachricht Algorithm could streamline harvesting of hand-picked crops
13.03.2018 | University of Illinois College of Engineering

nachricht A global conflict: agricultural production vs. biodiversity
06.03.2018 | Georg-August-Universität Göttingen

All articles from Agricultural and Forestry Science >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Locomotion control with photopigments

Researchers from Göttingen University discover additional function of opsins

Animal photoreceptors capture light with photopigments. Researchers from the University of Göttingen have now discovered that these photopigments fulfill an...

Im Focus: Surveying the Arctic: Tracking down carbon particles

Researchers embark on aerial campaign over Northeast Greenland

On 15 March, the AWI research aeroplane Polar 5 will depart for Greenland. Concentrating on the furthest northeast region of the island, an international team...

Im Focus: Unique Insights into the Antarctic Ice Shelf System

Data collected on ocean-ice interactions in the little-researched regions of the far south

The world’s second-largest ice shelf was the destination for a Polarstern expedition that ended in Punta Arenas, Chile on 14th March 2018. Oceanographers from...

Im Focus: ILA 2018: Laser alternative to hexavalent chromium coating

At the 2018 ILA Berlin Air Show from April 25–29, the Fraunhofer Institute for Laser Technology ILT is showcasing extreme high-speed Laser Material Deposition (EHLA): A video documents how for metal components that are highly loaded, EHLA has already proved itself as an alternative to hard chrome plating, which is now allowed only under special conditions.

When the EU restricted the use of hexavalent chromium compounds to special applications requiring authorization, the move prompted a rethink in the surface...

Im Focus: Radar for navigation support from autonomous flying drones

At the ILA Berlin, hall 4, booth 202, Fraunhofer FHR will present two radar sensors for navigation support of drones. The sensors are valuable components in the implementation of autonomous flying drones: they function as obstacle detectors to prevent collisions. Radar sensors also operate reliably in restricted visibility, e.g. in foggy or dusty conditions. Due to their ability to measure distances with high precision, the radar sensors can also be used as altimeters when other sources of information such as barometers or GPS are not available or cannot operate optimally.

Drones play an increasingly important role in the area of logistics and services. Well-known logistic companies place great hope in these compact, aerial...

All Focus news of the innovation-report >>>



Industry & Economy
Event News

Ultrafast Wireless and Chip Design at the DATE Conference in Dresden

16.03.2018 | Event News

International Tinnitus Conference of the Tinnitus Research Initiative in Regensburg

13.03.2018 | Event News

International Virtual Reality Conference “IEEE VR 2018” comes to Reutlingen, Germany

08.03.2018 | Event News

Latest News

Wandering greenhouse gas

16.03.2018 | Earth Sciences

'Frequency combs' ID chemicals within the mid-infrared spectral region

16.03.2018 | Physics and Astronomy

Biologists unravel another mystery of what makes DNA go 'loopy'

16.03.2018 | Life Sciences

Science & Research
Overview of more VideoLinks >>>