Friday, August 30, 2013

Southwest Missouri Field Crop Report for August 28, 2013

Contact: Jill Scheidt, agronomy specialist
Tel: (417) 682-3579

LAMAR, Mo. –Jill Scheidt, agronomy specialist with University of Missouri Extension in Barton County, scouted area fields on August 28 to prepare this week’s field scouting report.


This week, Scheidt did find several cases of mold on corn ears. However, this normally will not cause problems.

“Ear worm damage will encourage molds to develop, which was enhanced by the wet weather.  Ear worm resistant variety selection, such as tight husks, is the most effective way to manage mold growth,” explained Scheidt.

But she also adds this warning: some molds can product toxins, and the harvested grain should be analyzed before feeding.

“Producers need to be aware that the abnormally cool weather and cloudy days may have reduced pollination.  Be sure to check deep into the field.  While the outside rows may appear to have had good pollination, plants closer to the center of the field may have had unsuccessful pollination,” said Scheidt.

If this is the case in your field, the most practical solution is to put the corn up for silage.


A fungicide application to soybeans at the R5 stage, or beginning seed development, will most often result in a yield increase, if disease is present.

Fungicides applied at R6 may result in improved seed quality, but this is may not happen every year and there will seldom be a yield increase.

Podworms still need to be to be scouted in soybeans. threshold levels are one podworm per foot.
Bacterial blight and septoria brown spot may be seen in fields.

Bacterial blight has water soaked lesions that begin as yellow spots and progress to irregular brown to reddish brown lesions.  Bacterial blight is brought on by cool temperatures and heavy rains; hot dry weather reduces disease development.

Septoria brown spot develops angular to somewhat circular reddish brown spots that begin in the lower canopy.  Warm, wet weather favors disease development; dry weather reduces disease development.  Septoria brown spot can be differentiated from bacterial blight by fruiting bodies that can be seen under a hand lens.


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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