Common Diseases and Pests Continue to Rob Soybeans of Yield

Common Diseases and Pests Continue to Rob Soybeans of Yield

However, a deadly soybean disease is lurking in Africa. And, no, it's not soybean rust.

University of Illinois researchers identified the top pathogens, pests and weeds affecting soybean production in a recent article in Food Security. Soybean aphid, soybean rust, soybean cyst nematode, Sclerotina stem rot and the exotic pathogen, red leaf blotch, were featured as some of the top biotic constraints that may affect soybean production now and in the future.

"Enormous potential exists to increase future soybean production," says Glen Hartman, U of I professor of crop sciences and USDA-ARS research scientist. "Genetic resources, used through both traditional breeding and bioengineering, may provide the solutions needed to combat current and future disease problems."

As soybean production has increased over the past 50 years, so has the intensity of biotic constraints that ultimately threaten yield.

"Where soybean is grown every year or even every other year, pathogens often have increased in density to cause economic losses in yield," Hartman notes. "Parasitic microorganisms, including bacteria, fungi, nematodes, Oomycetes, and viruses all contribute to economic damage. A similar story occurs for pests; many, such as aphids, beetles, mites, and stinkbugs, cause considerable economic damage to the soybean crop."

Red leaf blotch

Although aphids, rust, nematode and Sclerotina stem rot are commonly known and recognized by soybean growers, less information is known on red leaf blotch, an exotic disease caused by the fungal pathogen Phoma glycinicola.

"The fungus that causes red leaf blotch is listed on the USDA Agricultural Select Agent List – the same list as anthrax," Hartman says. "So far, this disease has only been reported in Africa. However, if red leaf blotch is found in the United States, a recovery plan through the USDA-APHIS program has been developed that outlines a course of action to prevent it from spreading."

Red leaf blotch symptoms include lesions on foliage, petioles, pods and stems. The fungus does not appear to be seedborne, but may be transported along with soil and other debris in grain. Yield losses of up to 50% were documented in Zambia and Zimbabwe in the 1980s.

"We don't want to scare people because this disease has not been found in the United States," Hartman says. "But we do want growers to be aware of it because they are typically the ones to find new pathogens, pests and weeds in their fields. Our goal is to build awareness among crop specialists and producers so we can stay ahead of it."

More research is needed to develop molecular diagnostic techniques to identify this pathogen from other common foliar soybean pathogens, to provide better information on fungicide chemistry and application timing, to develop varietal resistance and gather more data to develop predictive models for potential containment and management.

To successfully reduce losses due to pathogens and pests, a number of practices used alone or in combination may be needed; these include cultural and seed sanitation techniques, pesticide applications, and deployment of soybean cultivars with resistance.

Hartman will discuss these pathogens and pests in addition to their threat levels at the 2011 U of I Agronomy Day on Thursday, August 18.

Agronomy Day attracts more than 1,000 people each year to the Crop Sciences Research and Education Center in Urbana to find out the latest information on technology and techniques to improve food and fuel production. For more information on speakers and displays, like University of Illinois Agronomy Day on Facebook or go to http://agronomyday.cropsci.illinois.edu.

TAGS: USDA
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