Friday, June 06, 2014

Nutrient Deficiencies Found in Corn, Armyworms No Longer a Threat

Contact: Jill Scheidt, agronomy specialist
Headquartered in Barton County
PHONE: 417-682-3579

LAMAR, Mo. - Jill Scheidt, agronomy specialist with University of Missouri Extension, scouted fields near Verdella on June 4 and sent out a phone report that day to subscribers to the MU Extension field crop scouting report.

“Wheat is in the soft dough stage; there are a lot of kernels, but they are not very full,” said Scheidt. “No more armyworms were seen and should begin pupating and no longer cause a threat.”

According to Scheidt, stagonospora glume blotch was seen in one wheat field. Stagonospora is promoted by cool, humid weather and is identified by irregular shaped lesions on leaves with black specks, called picnidia, on the lesion, dark spots will also occur on the kernel.

Scheidt scouted corn in the 11-12 leaf stage, several nutrient deficiencies were seen.

“Phosphorus deficiency is identified by slow, stunted early growth and purple leaves. Potassium deficiency is identified by firing or burning of leaf tips. Zinc and magnesium deficiency is identified by narrow white or yellow stripes between the veins. Zinc occurs in newer leaves, magnesium occurs in lower leaves,” said Scheidt.

“Soybeans were emerging; a little insect feeding was seen on cotyledons, but not enough to harm the plant,” said Scheidt. Additional information can be found at


The weekly field scouting report is sponsored by University of Missouri Extension and Barton County Extension. For more information on this scouting report, or to learn how to receive it a week earlier by telephone, contact the MU Extension Center in Barton County, (417) 682-3579.

VIDEO: A video about scouting for Armyworms can be viewed at:


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