Thursday, July 16, 2015

It's Time to Keep Track of Soybean Aphid Populations in Your Fields

Post was updated July 20, 2015

Soybean fields are being scouted in the region, with particular emphasis on soybean aphid and how populations are establishing and increasing.

Though field populations of aphids are quite variable, populations certainly are increasing as we would expect for this time of year. The majority of the fields we've scouted in the past two weeks were averaging under 20 aphids per plant HOWEVER we did have a few fields average from 50 - 60 aphids plant. In fields with these greater averages, the percent plants with aphids present were in the 90+ % range. Also within those greater number fields, we are finding randomly selected plants reaching into the 200+ aphid counts, though those plants represented only about 15% of the total plants randomly selected at individual sites.

The Downside of Insurance Insecticide Applications for Soybean Aphid

by Robert Koch (Extension Entomologist), Bruce Potter (IPM Specialist), Jeff Gunsolus (Extension Weed Scientist) 

For soybean aphid management, we encourage you to rely on scouting (actually getting into the field and looking at plants) and the validated economic threshold (average of 250 aphids per plant, aphids on more than 80% of plants, and aphid populations increasing) to determine when to apply insecticides for soybean aphid (see "Scouting for soybean aphid"). The threshold number of aphids is below the number required to cause yield loss and allows time to apply an insecticide before economic loss is incurred. However, you might be tempted to apply insecticides for soybean aphids at low population levels or without regard to the size of the aphid population in field, just in case you might have a problem. These "insurance" applications of insecticides can have negative impacts.

Annual Soil Health Field Day

August 6, 2015 

Langseth Farm in Barney, ND.  

Register online:

Monday, July 13, 2015

Cancellation of Small Grains Plots Tours

Madeleine Smith

Due to unforeseen circumstances, the 2015 Small Grains Plot Tours have been cancelled with the exception of the Fergus Falls location. The plot tour scheduled for today, Monday, July 13 will take place at 5:00 p.m. at the John and Chad Walkup Farm located at 11301 150th Ave in Campbell MN.

All other plots tours are cancelled. We apologize for any inconvenience caused. If you wish to talk to any of the speakers please feel free to contact them through the University of Minnesota Extension website where their contact details can be found  @ 

The field day at the Northwest Research and Outreach Center in Crookston is still planned for Wednesday July 15th. If there is rain, an alternative program will be conducted indoors.

Perley, July 13 cancelled
Oklee, July 14 cancelled
Halllock, July 17 cancelled
Strathcona, July 17 cancelled
Roseau, July 22 cancelled

Friday, July 3, 2015

Armyworms in small grains

from Dr. Ian MacRae, UMN Entomologist, NWROC - Crookston


We are receiving calls regarding armyworms in small grains in NW MN.

At this time they are small larvae (1/2"-3/4" long) and feeding in the lower foliage.  Scout for armyworms at grassy margins of the fields, low, weedy areas in fields or in lodged grain; populations are more likely to develop in these areas first.  Armyworms prefer the edges of leaves first and are messy, wasteful eaters.  They generally retreat during the day under soil and plant residue on the ground and feed more often beginning at dusk, it’s easier to scout for armyworm damage than the armyworms themselves.  Look for leaves that have been notched/cut, partially eaten leaf material on the ground, and small round pellets (armyworm frass, i.e. poop) near the base of the plants.