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Showing posts from July, 2017
Pyrethroid resistant soybean aphids: What are your control options? Bruce Potter (Extension IPM Specialist, U of MN), Robert Koch (Extension Entomologist, U of MN), Phil Glogoza (Extension Educator – Crops, U of MN), Ian MacRae (Extension Entomologist, U of MN), and Janet Knodel (Extension Entomologist, NDSU)  We are receiving an increasing number of reports of pyrethroid insecticide failures for soybean aphid management from northwest and central Minnesota, and northeastern North Dakota this year. However, many areas of Minnesota and North Dakota still have low, non-yield threatening aphid numbers and scouting should continue to determine when to apply insecticides.  In this article, we review the insecticide groups used for soybean aphid control (Table 1) and discuss the potential role of and challenges associated with insecticide mixtures.  We are all familiar with the multistate, researched-based economic threshold of 250 aphids/plant for determining when to apply insect
The Dicamba Dilemma:    Facts and speculations Used with permission by Aaron Hager, University of Illinois Dicamba injury to soybeans in a southwestern Minnesota field.  Photo: Stephan Melson Dicamba injury to non-target crops has dominated Extension discussions this week. Non-tolerant soybeans are extremely sensitive to this chemical and damage has been reported in a number of fields throughout the state. The following article by Dr. Aaron Hager at the University of Illinois echoes observations we have been making in Minnesota and summarizes injury symptoms on soybean, possible routes of exposure, and potential yield effects. His article is reprinted in its entirety Read more »

Soybean Aphid Speed Scouting: An option for people who don't like to count aphids

With the  focus on soybean aphid scouting , I still  like to promote the scouting procedure called “Speed Scouting” . The method speeds up making decisions on whether to treat or not based on the aphid’s population distribution in the field when the treatment threshold of 250 aphids per plant and 80% of the plants with these levels is reached.  
JUST THE FACTS: A review of the biology and economics behind soybean aphid insecticide recommendations As farmers and their advisers begin to make soybean aphid decisions for their fields, the timing is right for a fact-based review of what is known about soybean aphid, their effect on yield, and cost-effective management of this pest. 

Soybean Aphid in Red River Valley fields are increasing - Fields at threshold levels being reported

Soybean aphid populations have been increasing and fields with threshold level infestations are being treated. Populations in Northwest Minnesota are greatest in the counties of Norman and Polk, MN and in Grand Forks and Walsh counties of ND. 

Meet the newest member of the Extension crops team

On June 30 Angie Peltier joined the University of Minnesota as an Extension educator focusing on crops. She is housed at the Northwestern Regional Extension Office in Crookston and her research and education efforts are to focus on corn and soybean.  While Angie was born, raised and educated in Wisconsin, she most recently spent close to 6 years as a crops educator working for the University of Illinois Extension at the Northwestern Illinois Ag R&D Center in Monmouth. There her research focus was corn and soybean disease management.  Angie looks forward to both meeting corn and soybean farmers and other agricultural professionals in Northwestern Minnesota and learning more about their most pressing research and educational needs. Angie can be reached by mail, phone or email: Extension Regional Office, Crookston 510 County Road 71, Suite 119 Crookston, MN 56716 Phone: (218) 281-8027 Email: