Resistance to Bt-rootworm traits creates a management headache for corn growers and their advisors alike. While the temptation is great to merely layer more management inputs, it’s time to get a handle on the situation and re-assess your options, especially under today's tougher corn economics. This presentation will address the management challenges posed by resistance, review options, and provide viewers with a framework for making decisions on corn rootworm management. Specifically, we will refresh your basic information on corn rootworm management by exploring the pros and cons of individual management options (crop rotation, Bt-rootworm traits, soil insecticides, adult sprays), what works and doesn't work. From that foundation, I'll examine how to integrate these options into a more comprehensive decision framework. Re-learning corn rootworm management will enable participants to move away from insurance-based approach that favor resistance to a more dynamic approach that emphasizes managing corn rootworm populations by tailoring options to field-specific risk. This approach manages corn rootworm populations, reduces risk of resistance, and uses inputs that are truly needed.

CCA/CPAg:  0.5 Integrated Pest Management
CPSS/CPSC:  0.5 Professional Meeting

Ken Ostlie
Professor and Extension Entomologist
Unviersity of Minnesota

My educational philosophy is to engage farmers, and their advisory ag professionals, in exploring the contemporary management challenges posed by changing insect risks, evolving technologies and dynamic production needs. These challenges provide an excellent opportunity to teach insect biology, ecology and management at its interface with crop production. I relish the constantly changing educational situation; every year brings different insect problems. Major foci of my extension activities have changed drastically over the last 10 years: European corn borer has faded from its status as a key pest only to be replaced by corn rootworms as their resistance to crop rotation intensifies. The invasive soybean aphid arrived in 2001 and changed the face of soybean production. Changing weather patterns has brought to the forefront other insect problems: bean leaf beetle, two-spotted spider mites and western bean cutworm. The introduction and rapid adoption of biotechnology has revolutionized corn rootworm and corn borer management. The necessity for insect resistance management vies with economic and logistical realities that farmers face in deciding their production practices. The current “insurance approach” towards use of crop inputs, such as Bt-corn, seed treatments and foliar insecticides now pose the greatest single hurdle to extension education programs.

$12.50 Members/Certified Professionals
$20.00 Non-members

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Seminar Information
Seminar Date:
October 01, 2015
Re-learning CRW Management in the Transgenic Era
Speaker Information
Ken Ostlie   [ view bio ]
Individual topic purchase: Selected
American Society of Agronomy
Integrated Pest Management : 0.50
Soil Science Society of America
Professional Meetings: 0.50
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