AgEBB-MU CAFNR Extension

David Burton
Civic Communications Specialist
2400 S. Scenic Ave.
Springfield, MO 65807

August 4, 2017

Field Crop Scouting Report
Scout for Insects in Soybean and Milo

LAMAR, Mo. — Jill Scheidt, agronomy specialist with University of Missouri Extension, scouted fields west of Lamar and near Arcola for the July 19 crop scouting update.

Printed reports are sent out two weeks after the report to allow subscribers to phoned reports the full benefit of their subscriptions. Barton County MU Extension sponsors the field scouting report. For more information on the scouting report, or to learn how to receive the information earlier by telephone, contact the Barton County Extension Center at (417) 682-3579.


Corn was in the milk to beginning dough stage. Kernels were filled to the tip and no disease present.

Scheidt observed corn earworms in a small amount of ears.

"No threshold exists for corn earworm as it is usually not economical to treat with an insecticide, if they are a problem, select varieties with tighter husks next season," said Scheidt.


Soybeans were in the third trifoliate to beginning seed stages.

Scheidt observed bean leaf beetle and a few Japanese beetle.

"Defoliation was less than three percent; threshold for any foliage feeding insect in soybeans are thirty percent defoliation before bloom and twenty percent defoliation during or after bloom," said Scheidt.

Scheidt advises scouting for soybean podworm in blooming and more mature beans. Threshold is one per foot of row or when five percent of pods are damaged.

"A few cloverworm were seen, but no podworms. Cloverworms are predominantly foliage feeders," said Scheidt.


Milo was nearing the boot stage. Scheidt did not find sugarcane aphids.

"Look on the underside of the leaves for small yellow aphids. Once aphids are seen, scout daily as populations can increase rapidly. Do not treat milo unless populations are at or close to threshold as an insecticide application can kill beneficials that are currently keeping the aphid population in check," said Scheidt.

Source: Jill Scheidt, (417) 682-3579

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