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Ag Professional and Grower Insect and Disease Field Day at the Rosemount Research and Outreach Center

by Dave Nicolai, Extension Crops Educator

The University of Minnesota Extension and IPM program are sponsoring an Ag Professional and Grower Insect and Disease Field Day. The Field Day will be held on Wednesday, September 5 from 9:00 am to 1:00 pm at the Rosemount Research and Outreach Center located at 16975 Arkansas Avenue in Rosemount. Agricultural professionals and growers are invited to the field day for a tour of applied insect and disease research conducted by University of Minnesota Extension faculty. Topics will include soybean aphid research, corn and soybean diseases and corn rootworm research and management.

The Field Day will be held on Wednesday, September 5 from 9:00 am to 1:00 pm at the Rosemount Research and Outreach Center located at 16975 Arkansas Avenue in Rosemount.

Registration begins, with coffee and donuts, at 8:30 am and the bus leaves promptly at 9:00 am.

The registration fee is $25 per person, includes lunch and program materials.

To reserve your spot, register online at or contact Larisa Jenrich at 651-480-7732 or

Soybean Aphid Research and Management

Dr. Bob Koch, University of Minnesota Extension Entomologist will provide an overview of soybean aphid management. This presentation will focus on soybean aphid and the Japanese beetle in soybean. Insect pest topics will include:
  • Techniques for scouting soybean aphid.
  • Continued validity of the economic threshold (250 aphids per plant) for aphids.
  • Management of insecticide resistant soybean aphid.
  • Scouting for and management of Japanese beetle.

An understanding of these topics will be gained through presentation of recent research results and hands on activities in the field. Participants will see demonstrations of insecticide efficacy. Methods for scouting and making treatment decisions for these pests will be discussed and practiced. Discussion will include potential for integrating management tactics.

Corn and Soybean Diseases

Dr. Dean Malvick will provide an update on soybean and corn diseases through discussion and visits to field research plots. This part of the field day will emphasize sudden death syndrome (SDS) and white mold of soybean, and northern leaf blight, bacterial leaf streak (BLS), and Goss's leaf blight and wilt of corn. Most of these diseases can greatly reduce yields. Weather conditions in 2018 have been favorable for development of SDS, BLS, and Goss's wilt in some areas. Other diseases developing in the state this year will also be discussed.

The crop disease topics to be covered will include:
  • A review of diagnostic procedures for these diseases.
  • Discussion of factors that favor these diseases and how they reduce yield.
  • Discussion of new research on these diseases.
  • Review and demonstration of management options, including resistant varieties and fungicide.

Corn Rootworm Research and Management Strategies for 2018 and Beyond

Dr. Ken Ostlie and Edwin Benkert will provide an update on corn rootworm status and management strategies as we visit field research plots on transgenic Bt corn and soil insecticide performance. Over the last decade, corn rootworms have been primarily managed with Bt-RW traits. Declining corn economic situation have growers re-thinking their management inputs with a shift from traits to conventional corn and soil insecticides. Complicating this situation is the ongoing development of Bt-RW resistance, changing population dynamics of western and northern corn rootworms, and increasing use of soil insecticides.

This session will focus on:
  • Status of Bt-RW traits and Bt-RW resistance.
  • Comparative efficacy of Bt traits under heavy pressure (and resistance).
  • Identifying and troubleshooting performance problem fields (signs of trait/insecticide failure).
  • Soil insecticide options (focus on new technology and products).
  • Relative performance of liquid and granular soil insecticides under heavy pressure.

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