Thursday, September 12, 2013

Southwest Missouri Field Crop Report for Sept. 11, 2013

Contact: Jill Scheidt, agronomy specialist
Headquartered at Barton County Extension Center
Tel: (417) 682-3579

LAMAR, Mo. –Jill Scheidt, agronomy specialist with University of Missouri Extension in Barton County, scouted area fields on Sept. 10 to prepare this week’s field scouting report.

Funguses and ear rots in corn have decreased due to dry weather.  Corn is at black layer, or maturity and kernels contain 28-35 percent moisture content.

“To observe how close corn is to black layer, break a corn ear in half and observe the cross-section of the top half of the ear,” said Scheidt.

Data from Mississippi and Louisiana show the field drying rate from maturity, or black layer, occurs at about 0.6 percent per day until the grain reaches 15 percent moisture.  Corn should be harvested at 15 percent moisture.

Most soybeans are beginning to make pods or beginning to form seeds.

Grasshoppers are feeding on foliage; foliage threshold levels are 20 percent defoliation after bloom.  Green stinkbugs were also seen; green stinkbugs can reduce seed quality and quantity by directly feeding on the seed with their piercing, sucking mouthparts.

Green stinkbugs can also cause delayed maturity; threshold levels are 1/foot.

“No pod worms have been seen yet, but still need to be scouted.  Pod worms can cause a large amount of damage to a field in one night, pod worm threshold levels are 1/foot,” said Scheidt.

Pod worms come in many different colors, but can be identified by the 4 pro-legs at the center of the body; to differentiate from clover worms, which have 3 pro-legs at the center of the body.

“It is important to differentiate between the two, because clover worm are beneficial insects that carry a fungus that kills pod worms; so do not spray an insecticide unless threshold levels are reached.  Use different modes of action if more than one insecticide application needs to be made in order to prevent insect resistance,” said Scheidt.


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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