Thursday, September 26, 2013

Southwest Missouri Field Crop Report for Sept. 25, 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. 25 to prepare this week’s field scouting report.

“Corn is at maturity and disease and insect threats are no longer an issue in southwest Missouri fields.  Just make sure moisture content in corn is at 15% before harvesting,” said Scheidt.

Pod feeding by pod worms, bean leaf beetles, and possibly grasshoppers were seen this week.

Bean leaf beetle threshold levels are when 5 percent of pods are damaged and bean leaf beetles are present in the field.  Bean leaf beetles should not be a threat for much longer according to Scheidt.

“Cold nighttime temperatures or shorter daylight periods are thought to effect bean leaf beetles.  Once these environmental changes happen, bean leaf beetles tend to go to the woods to overwinter,” said Scheidt.

Pod worm thresholds are when 5 percent of pods damaged or 1/pod worm per plant is present field.  Pod worms pose a threat until the first frost or until seeds begin to dry down.

“Soybeans are at the most at risk for pod worm feeding when pods begin to fill.  Small pod worms feed on foliage feeding first, and then move to seeds,” said Scheidt.

Once seeds begin to mature and lose moisture, pod worms will not feed on seeds.  Hero mixed with Lorsban and a lot of water provides the most effective control against pod worms.

“The R4- R6 stage or, full pod to full seed stage is the most critical time in soybean plant development.  If diseases are present during these stages, a fungicide should be applied.  Once soybeans begin to mature, a fungicide application is no longer economical,” 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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