Thursday, July 24, 2014

Scout for Podworms in Blooming Soybeans

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

LAMAR, Mo. -- Jill Scheidt, agronomy specialist with University of Missouri Extension in Barton County, scouted fields south of Lockwood near Hwy. 97on July 23 for the crop scouting program. Scheidt offers this advice from the field.


Corn is in the milk stage and should enter the soft dough stage soon.

“Very little Japanese beetles and corn earworms were seen in corn. Corn earworm feed at the tip of the ear while other worms like armyworms feed near the middle or base of the ear. Any injury to the ear will make the ear more susceptible to disease,” said Scheidt.

A video from Scheidt about scouting for corn earworms is available online at:


Soybeans are in the third trifoliate and bloom stage, pods should begin to form soon.

“Monitor blooming soybeans for podworms. Podworms are many different colors and can have longitude stripes; to differentiate between other worms, look for black dots all over the body, this is an identifier of podworm,” said Scheidt.

Threshold levels are 1 per foot of row or when 5 percent or more pods are damaged.

“Not much insect feeding was seen,” said Scheidt.

Threshold levels for all foliage feeding insects in soybeans are 30% defoliation before bloom and 20 percent defoliation during or after bloom.

Scheidt says soybean cyst nematodes were found in one field.

“If there is an area of stunted growth, pull up a plant and examine the roots for small circular growths, looking like miniature nodules- these are soybean cyst nematodes,” said Scheidt.

These parasites can severely stunt growth and reduce yields. In order to manage SCN, rotate with non-host crops like corn, wheat or sorghum and control weeds.


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.


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