Category Archives

Archive of posts published in the category: Soybean

Small vs large plots for fungicide research in field crops

Over the last 10-15 years there has been much discussion in the agricultural realm about the utility of fungicide trials conducted on small plots, vs those on larger plots.  Small plots typically are 5-10’wide, and 20-50’ long, depending on the crop and study. …


Stem Canker on Soybeans

Stem canker is a disease that has been observed at increasing levels in many regions where soybeans are produced.  In Delaware and Maryland we typically observe both Northern and Southern stem canker.  Although different in some aspects, their overall impacts and management are…


Southern Blight in Soybeans

Southern blight of soybeans, caused by the soilborne fungus Sclerotium rolfsii, is increasing in areas of Virginia and may be observed in some areas of Delaware and Maryland.  This is not the same as the white mold pathogen Sclerotinia sclerotiorum, although it is…


Seedling diseases of soybeans

Soybeans grown in Delaware and Maryland can succumb to various diseases early in the growing season.  These diseases typically are favored by conditions that slow soybean emergence and favor pathogen growth, such as wet weather immediately following planting.   There are several pathogens that…


Hail damage and fungicides in field crops

With recent hail in the region, some growers may be wondering about the use of certain fungicides (specifically some containing strobilurin active ingredients (QoI FRAC group 11) for the mitigation of plant stress or to protect the plant against wounded plant tissues. Some…


Soybean Losses Due to Diseases

Diseases significantly impact soybean production throughout the United States.  In Delaware, diseases such as Soybean Cyst Nematode, Root Knot Nematode, and stem canker can cause significant annual yield losses.  Plant pathologists throughout the United States collect disease loss data each year.  This data…


2017 Nematode Assay Service Note

The University of Delaware will not offer an open nematode assay service in 2017.  Growers and other professionals with urgent issues can contact their local extension agriculture agent or Dr. Nathan Kleczewski at 302-300-6962 or for assistance with nematode identification, enumeration, and…


2016 Soybean Vein Necrosis Disease survey and Thrips Data now Available

We have been studying Soybean Vein Necrosis Disease in the Delaware/Maryland region since 2013 to better understand the disease and if it may have an impact on our soybean production.  The disease is caused by a virus, and moved from plant to plant…


Brown Stem Rot in DE Soybeans

Brown Stem Rot (BSR) is a fungal disease of soybeans that has never been positively confirmed in the Chesapeake Bay area, although suspect plants have been occasionally observed over the years.  We have not observed significant levels of this disease, but it will…


Research Updates on Soybean Vein Necrosis Virus

Soybean Vein Necrosis Virus (SVNV) is a relatively new virus of soybeans.  Currently, SVNV is the most prevalent virus in soybean production in the United States.  Surveys in Delaware in 2015 detected the virus in over 72% of fields, with 69% of full…