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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 insecticides for soy…

UPDATE: NW MN Soybean Aphid Scouting Summary for July 21 to 28, 2017

Soybean aphid populations continue to increase in NW Minnesota. Populations are increasing in the west central and central areas, too. More fields are being treated, HOWEVER, not every field is at threshold. 

Reports for southern MN can be found at Southwest Minnesota IPM Stuff Newsletter

Comments from his July 31 report:
"Treatment of economic threshold populations are now being made in more southerly areas and the general trend is trend is economic threshold populations developing from north to south.

"Parts of Central Minnesota are receiving insecticide applications and sentinel plots at Morris had a fairly uniform 40 aphids/plant early last week. Some fields in parts of the Minnesota River Valley are at economic threshold now.

"As of last week, there were many areas of MN, including most of the SWROC, that still had low aphid populations. Winged aphids can change that quickly.

"The next two weeks will be the critical scouting window for most areas. Remember that …

NW MN Soybean Aphid Scouting Summary for July 17 to 22, 2017

Soybean aphid populations continue to increase in NW Minnesota. Below is a summary of scouting reports from July 17 to 22. The map reflects increasing numbers and treatment decisions in the NW region. 

Fields scouted in the west central and south central also show increasing numbers from last week. 

Bruce Potter, UMN Extension IPM Specialist, reports fields in those southern areas where populations are approaching treatable numbers that will likely be sprayed this week in southern MN. He adds that some fields have already been sprayed, not many but some. Additional reports for SW MN can be found at Southwest Minnesota IPM Stuff Newsletter prepared by Bruce. Subscribe or follow the link to read his updates.
FRIDAY, JULY 21, 2017
SOYBEAN APHID INFESTATIONS AND REPORTS OF FAILURES OF PYRETHROID INSECTICIDES TO CONTROL SOYBEAN APHID 
Robert Koch (Extension Entomologist), Ian MacRae (Extension Entomologist), Bruce Potter (Extension IPM Specialist), and Phil Glogoza (Extension Educator – Crops)


By now you should be scouting your soybean fields for soybean aphid on a regular basis. Soybean aphid can be found in most fields throughout the state and populations have reached economic threshold (250 aphids per plant) in some fields in northwest Minnesota and have require insecticide application to protect soybean yield. In northwest Minnesota (especially around Norman County), applications of pyrethroid insecticides are failing to adequately control aphid populations in some, but not all, fields.

This is the third year in a row that we have received reports of failures of pyrethroids to control soybean aphid in Minnesota. In 2015 and 2016, field-level failures of pyrethroid insecticides were repo…

MDA Meetings in NW MN for the Proposed Nitrogen Fertilizer Regulation

MDA extends comment period on proposed nitrogen fertilizer regulation

Public input sought at meetings scheduled in Northwestern Minnesota

St. Paul, MN - The Minnesota Department of Agriculture (MDA) has extended the public comment period for its draft proposal for the use of nitrogen fertilizer in Minnesota. The purpose of the proposed Nitrogen Fertilizer Rule is to minimize the potential for nitrate-nitrogen contamination from fertilizer in the state's groundwater and drinking water. Public comments will now be accepted through Friday, August 25, 2017.
The Dicamba Dilemma:Facts and speculations

Used with permission by Aaron Hager, University of Illinois

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 »
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: apeltier@umn.edu