Thursday, October 03, 2013

Southwest Missouri Field Crop Report for Oct. 2, 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 Oct. 2 to prepare this week’s field scouting report.

“It is important to observe the Hessian –Fly-Free-Date when planting wheat to avoid stunting and in severe cases, plant death, caused by larvae feeding,” said Scheidt.

According to Scheidt, Oct. 10 is the Hessian-fly-free-date for counties between northern Vernon and southern Jasper Counties and stretching east to the state line.  Counties south of Jasper County should wait until Oct. 14 and counties north of Vernon County can begin planting wheat Oct. 6 to avoid Hessian flies laying eggs in emerging wheat plants.

“Weather conditions could cause bacterial and septoria blight to show up on soybean leaves. Both occur after periods of rain and can be identified by odd shaped lesions on the leaves and pods,” said Scheidt.

Septoria can be differentiated by the fungal fruiting bodies on the lesions that can be seen with a hand lens.  Septoria symptoms develop during temperature ranges of 59-86 degrees with 77 degrees being optimum for disease development.  There is no fungicide treatment available for these diseases; hot, dry weather restricts and decreases disease development.

Scheidt says that some pod feeding has been seen.  Grasshoppers and pod worms may be the source.  Threshold levels for pod worms are 1/foot or 5 percent pod damage when pod worms are present.  As soybeans mature, pod feeding from insects will decrease.  Above threshold levels of green stinkbugs were seen in most fields.

Green stinkbugs pierce soybean seeds and can cause shriveled seeds and decreased seed quality.  Threshold levels are 1 green stinkbug/foot, but if soybeans have reached the full seed stage and are beginning to mature, it is no longer economical to spray for stinkbugs.


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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