Wayne Ohnesorg - Extension Educator

Wayne Ohnesorg

faculty
Work
1305 S 13th St Norfolk NE 68701-6655
US
Work 402-370-4044 On campus, dial 7-4044
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icon-academic-capEducation

  • Ph D, University of Nebraska-Lincoln, 2016
  • MS, Iowa State University, 2008
  • BS, University of Wyoming, 2005

icon-bookmark-starAwards & Honors

  • Achievement Award, National Association of County Agricultural Agents, 2017
  • Entomology Educational Project Award, North Central Branch of the Entomological Society of America, 2017
  • #1 Agriculture App for 2012, CropLife, 2012

Location: Madison County
Focus Areas: Entomology, integrated pest management (IPM), mobile scouting tools for agriculture, and mobile apps.

Soybean aphid

Although at Low Levels, Soybean Aphids Are in Northeast Nebraska

July 15, 2020
The infestations appear to have occurred recently, as the aphids were only observed on leaves that had not yet expanded completely. The economic threshold for late vegetative through R5 stage soybeans is 250 aphids per plant with 80% of the plants infested and populations increasing.

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western bean cutworm eggs and larvae

Scouting and Treatment Recommendations for Western Bean Cutworm

July 11, 2017
Scouting is urged for Western bean cutworm in corn as moth flights are active and particularly heavy in south central Nebraska this week. This article includes trapping reports and recommendations for scouting and treatment.

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Corn damaged by wheat stem maggot

Suspected Wheat Stem Maggot Damage in Corn following Cover Crops

June 13, 2017
Ag professionals across central and eastern Nebraska are reporting insect damage to corn following rye and wheat cover crops, likely from the wheat stem maggot. A recent field survey found stand losses in fields ranged from 2%-30% on a whole-field basis.

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Map showing sites of Nebraska soybean fields in study of yield-limiting production factors
Map showing sites of Nebraska soybean fields in study of yield-limiting production factors

Help Us Identify Yield-Limiting Factors in Nebraska Soybean Fields

October 5, 2016
Nebraska soybean producers are being asked to answer a survey about their soybean fields and contribute to a benchmark study of current soybean production in Nebraska. Researchers from 10 north central states, including Nebraska, are collecting the data to identify factors that may be impeding growers from reaching full yield. See what they've learned in the first two years of the study and how they hope to use the information.

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Soybean aphid speed scouting app
Soybean aphid speed scouting app

Soybean Aphid Scouting and Management

July 28, 2016

The current recommended economic threshold for late vegetative through R5 stage soybeans is 250 aphids per plant with 80% of the plants infested and populations increasing. Depending on economic conditions, this generally gives you about five to seven days to schedule treatment before populations reach economically damaging levels.

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Soybean Aphid
Soybean Aphid

Soybean Aphids Found in Northeast Nebraska; Scouting Warranted

July 28, 2016

This week soybean aphids were found in several northeast Nebraska fields at low numbers. Although it has been too hot for soybean aphids to thrive, populations could quickly increase with cooler temperatures. Scouting is recommended at this time.

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Soybean aphid
Soybean aphid

Decision Making for Soybean Defoliating Insects

July 15, 2016
July is when growers start to see a variety of defoliators in Nebraska soybean fields. It's easy to overestimate the amount of defoliation and soybean plants can compensate for some leaf area loss. This article describes how to assess defoliation and provides basic treatment thresholds.

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Soybean defoliation levels
Figure 1. Levels of soybean defoliation. Impact of losing leaf area depends on growth stage.

Soybean Defoliation Worksheet

July 13, 2016

While soybean defoliation, the most common injury to soybeans from insects, can look devastating, soybean plants can often compensate for the leaf loss. When making pest-management decisions, crucial considerations are the size of the remaining leaf canopy and the soybeans' growth stage.

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