Wayne Ohnesorg - Extension Educator

Wayne Ohnesorg

1305 S 13th St Norfolk NE 68701-6655
Work 402-370-4044 On campus, dial 7-4044


  • 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.

Card promoting the Confronting Cropping Challenges meetings

Confront Crop Challenges and Update Applicator Certification

November 27, 2018
Confronting Crop Challenges will be the focus of five meetings to be held in northeast Nebraska this December. Each offers updates on recent crop and pest issues in eastern Nebraska as well as pesticide applicator recertification training.

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Soybean aphid speed scouting app

Scouting and Managing Soybean Aphids

August 2, 2018
Recommendations for scouting and managing soybean aphids, including why the 250-aphids-per-plant threshold is used. Two tools―an app and Excel worksheet―can help speed up scouting in the field and indicate when treatment is warranted.

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Soybean aphid

August Prime Time for Soybean Aphids

August 2, 2018
Soybean aphid populations can explode in August under favorable conditions. Vigilant scouting is recommended, especially in northeast Nebraska where populations have historically been highest, to allow for timely management decisions.

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Western bean cutworm moth
Figure 1. Western bean cutworm moth (Photos by Julie Peterson)

Scouting and Treating Western Bean Cutworm

July 11, 2018
Western bean cutworm egg masses have been reported on field corn in a number of locations across the state this week. Here's what to look for in the field, treatment thresholds and recommendations.

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Painted lady caterpillar

Northeast Nebraska Insect Pest Update

January 8, 2018
Part of the 2018 Crop Production Clinic Proceedings, this article reviews insects to expect in northeast Nebraska crops and links to resources on management.

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aphid speed scouting app

Soybean Aphid Scouting and Management

July 15, 2020
The current economic threshold for soybean aphids is 250 aphids per plant with 80% of the plant infested and populations increasing. The article discusses the basis for this threshold and two scouting methods, including a speed scouting app, and management guidelines.

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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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