Diseases found in New York soybeans and corn

Apr 21, 2015

One disease is new to New York, the other hasn’t been seen in 30 years

A project conducted by the Northern New York Agricultural Development Program has discovered a disease in corn that’s been absent for 30 years and a disease in soybeans that’s completely new to New York.

The research, led by Gary C. Bergstrom, a Plant Pathologist at Cornell University discovered head smut in corn located in Jefferson County and northern stem canker in soybeans also planted in Jefferson County.

Head Smut
This disease in corn surprised researchers because it hasn’t been confirmed in New York since the 1980s. The University of Nebraska-Lincoln states that it’s caused by the Sphacelotheca reiliana fungus. It can cause yield loss and impact marketability because some countries will restrict imports. Head smut can sometimes be confused with common smut.

Symptoms of head smut can include wire-like extensions on the ear or tassel, the plant may have a teardrop-shape and lack of silks in the husks.

Management of head smut can include planting corn earlier or using fungicides.

Northern Stem Canker

Northern stem canker had never been discovered in northern New York but was found in western New York in nine soybean fields in 2014.

The University of Wisconsin says it’s caused by Diaporthe phaseolorum var. caulivora or Diaporthe phaseolorum var.meridionalis.

Symptoms of northern stem canker can include small lesions that are reddish-brown in color and appear in the leaf scar.

Yield losses due to northern stem canker can range from 50 to 80%

Management practices can include deep plowing, crop rotation and foliar fungicides.

Join the discussion and tell us if you’ve ever had to manage any of these diseases. How did you do it? What measures did you take to make sure they don’t come back?

Different kinds of corn seeds

Video: Spring weed control in winter wheat with Broadway® Star (pyroxsulam + florasulam)

#CortevaTalks brings you a short update with Cereal Herbicides Category Manager, Alister McRobbie, on how to get the most out of Broadway® Star.

Significant populations of grassweeds, including ryegrass and brome, can threaten winter wheat yields. Spring applications of a contact graminicide, such as Broadway Star from Corteva Agriscience, can clear problem weeds, allowing crops to grow away in the spring.

Broadway Star (pyroxsulam + florasulam) controls ryegrass, sterile brome, wild oats and a range of broad-leaved weeds such as cleavers. It can be applied to winter wheat up until GS32, but the earlier the application is made, the smaller the weed, and the greater the benefit to the crop. Weeds should be actively growing. A good rule of thumb is that if your grass needs cutting, conditions are right to apply Broadway Star.