Crops News

Ag PhD Crop Scouting Reports — July 12, 2017


The Ag PhD Crop Scouting Reports are supplied by contributors to Hefty Seed Co., based in Baltic, South Dakota. Find more online at and



Augusta, AR
Let me just confirm that nutsedge cannot handle two applications of a 1/3 oz of Classic with your Liberty. We have some really bad fields with those heavy patches (inherited), and I looked today behind that second post application of Liberty and Classic and man we smoked it. That was good news because my farmer thought I was wasting his money after round one, I was doing my victory dance and he wasn’t mad anymore…about that anyway! — Joey York



Georgetown, IL
With the amount of rain we have been receiving in the last week, conditions are getting more favorable for disease pressure to rise. The conditions are perfect for gray leaf spot right now. Keep a close eye on your no-till and/or your corn-on-corn fields as these will have a higher probability of infection due to the fact the fungus lives in corn residue from previous growing seasons. Fungicides we are recommending for best control are Trivapro at a 13.7 oz rate or Headline Amp at a 10 oz rate. — Tyler Smith

Princeton, IL
I spoke recently with a farmer that just sprayed XtendiMax in his Xtend soybean field and saw some speckling. This is caused by such a large concentrated droplet of product hitting the leaf surface. This will not harm the soybeans and they will grow out of it in short order. The recent warmer weather is just causing this visual speckling to show up more. — Matt Denton

Soybeans this season seem to be abnormally slow to reach canopy. Herbicide timing can be tricky with a short but normally maturing crop. The crop maturity says the window is closed or nearly closed to adding a residual herbicide product to your tankmix. Read labels diligently before spraying. — John Becker



Sheldon, IA
We are starting to see bugs come into the area in soybeans. The numbers are low right now, but we will want to keep an eye on things so they don’t increase quickly. When we spray fungicides we can add an insecticide and get two jobs done with one pass. — Adam Sauer



Hancock, MN
There are many bugs reaching threshold in the area. Soybean aphids are reaching numbers in the hundreds per plant in pockets in northwestern Pope County as well as reports of leafhoppers in alfalfa and dry beans in Stevens County. High numbers of pea aphids in alfalfa are requiring Lorsban or a high rate of Cobalt to be effective. There are also many thistle caterpillars making their home in soybean fields by wrapping up a trifoliate in a web and making a cocoon inside. These thistle caterpillars are not very destructive even at high levels so treatment is seldom needed. They will soon hatch into painted lady butterflies. — Adam Gibson

I’ve seen a few thistle caterpillars showing up in soybeans around our area. These are also known as painted lady caterpillars since they turn into painted lady butterflies. Leaf feeding will generally show up around the V3-V4 stages. They show pretty obvious signs of their presence, because they wrap a silk “cocoon” around the leaf that they are feeding on. They generally do not build up a high enough population to cause economic damage in soybeans, but if leaf feeding gets to 20%, it would be beneficial to spray. Generic Warrior at the full rate should take care of these pests, should you get to threshold. — Aaron Giese

Janesville, MN
I’m starting to see some septoria brown spot while scouting soybean fields. Septoria brown spot starts in the lower leaves of the plant, will be brownish, yellow, and/or spotted, and it is favored by rainy and warm weather. If you are seeing this in your fields when scouting, we suggest a fungicide application. — Josh Bruns

LeRoy, MN
What is the best insecticide to use? There are many options to choose from. Most come from the pyrethroid family and are fairly inexpensive. Warrior and the generic Warriors have been very popular. However, if spider mites are a concern, they will most likely cause a flare up because they will kill everything other than the mites. Bifenthrin (Capture, Brigade) is a pyrethroid that will control spider mites in this region. It’s about $1.50/acre more but will have great control. Cobalt Advanced is a combination of a second generation pyrethroid and Lorsban. It’s also very competitively priced and effective. — Grant Lunning

Olivia, MN
A triazole and copper are the second recommended spray by Southern Minnesota Beet Sugar Cooperative. There are many triazoles to choose from, just remember to use a different one each spray pass. — John Scheibel

There are two things you should use with your Liberty herbicide: AMS at 3 lbs/acre and either Latch, Liberate, or Interlock at 1 qt/100 gal water to help the spray coverage immensely. — Aaron Spronk

If you are still spraying XtendiMax or Engenia, make sure you do not spray on a humid day with no wind. We have gotten a couple reports of these products volatilizing, so make sure conditions are suitable for spraying. Wind should be between 3-10 mph. — Tony Hagen

Thief River Falls, MN
We are seeing the last pass of herbicide going on many of our soybeans in the area and some growers are looking to foliar feed the soybeans with something to perk them up. I would recommend a product like AC-97. At 1 qt/acre, you are getting a good shot of micronutrients along with a glyphosate safener that will help the soybean work off the herbicide quickly and continue growing quickly. — Jordan Swanson

Winthrop, MN
Many farmers are now applying a second application of Roundup on soybean acres. Adding in 2 oz/acre of MegaGro will reduce yellow flash and stimulate growth. You may also add a fungicide at this time to increase plant health and reduce chance of disease. — Dean Christiansen



Bertrand, MO
Nearly all soybean planting in our area is completed. There are a few fields that require some spot planting. — Albert Duenne

Hayti, MO
Water pH and total dissolved solids (TDS) can adversely affect some pesticides, particularly glyphosate herbicides and chlorpyrifos insecticides. Many pesticides have short half-lives in pH levels greater than 7. Chemical performance may be improved by researching ideal water pH levels for your application and adjusting it as necessary. — Danny Stevens



Laurel, NE
Fungicide application time is fast approaching; an application during R2-R3 has shown to have the best return on investment. It is a good time to get plans made. — Rusty Reifenrath

West Point, NE
We are seeing western bean cutworm out in the corn fields. Be scouting; if you see them you need to be addressing this very soon. I like using Brigade for a treatment. — Jacob Gubbels



Aberdeen, SD
We are seeing some high rates of Roundup going on straight Roundup beans. Consider adding 2 oz/acre of MegaGro to help safen the Roundup. Farmers who are using it are seeing the crop continue growing fast and are avoiding a yellow flash in their fields. — Kalen Kjellsen

Baltic, SD
I was out walking some fields this morning and found my first soybean aphid. For the most part the soybeans are in late R1 stage, just about to enter R2. Farmers in our area feel they can justify spraying for aphids at R2 once you get more than 10 aphids per plant based on local and statewide research. — Tyler Koenig

Freeman, SD
With the drier conditions, make sure you are scouting your fields for insects, primarily two-spotted spider mites. I haven’t seen any yet, but that does not mean they’re not around. Hot, dry conditions speed the reproduction and slows the activity of fungal diseases that attack mites. Mites feeding on leaves produce white or yellow concentrated spots, most commonly found on the underside of the leaves. As the injury continues, entire leaves turn from green to yellow to brown. Most of the damage will begin in the lower canopy and work its way up. Many producers will commonly mistake this infestation as “drought.” Since they are hard to spot with the naked eye, a good test is to take some of the potential injured leaves and shake them over a white piece of paper. With a magnifying glass you will be able to see small spider-looking insects crawling around. There are effective, reasonably priced products such as Brigade to combat this pest. — Matt Zilverberg

Huron, SD
Carefully weigh options for harvesting drought stressed crops as nitrates are most likely high, so have the plant tested and proceed with the best options to salvage the crop. — Alan Williams

Kimball, SD
I had a customer see great results from a heading application of 28% nitrogen on his winter wheat. He gained 3-4% protein. — Mike Erickson

Watertown, SD
If you see volunteer corn in your soybeans and you don’t kill the volunteer corn, you will likely have more rootworm pressure next year when you plant corn. Use Select Max at a minimum rate of 6 oz/acre with your Roundup plus put in 1 qt of surfactant per 100 gallons of water. — Russ Werning

Guys in the area have been seeing aphids pop up in alfalfa. To keep the cost down, using a generic pyrethroid has been the chemical of choice. In most cases they have been using a rate of 3.2 oz/acre. — Beau Wensing



Quincy, WA
As growers work through wheat harvest, there are a few fields that will need a post-harvest burndown. With the extra rain we saw this year, the weeds will be thriving after the crop is taken off and they can get full sunlight. An option for post-harvest burndown growers are gravitating to this year is Gramoxone partly because it has dropped significantly in price. However, if you have weeds that Gramoxone is weak on like kochia, 22 oz of glyphosate and 22 oz of Gramoxone has been showing good results. Do not run less than a 15 gal/acre rate. — Devin Moon


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