Blog

Bob Hartzler
June 10, 2016 4:11 PM

One of the less rewarding tasks of pest management is gleaning information from pesticide labels. Because of the complexity of labels, many people rely on guides produced by universities or distributors to identify solutions for pest problems. While these guides are convenient, they are not...

Pesticide Education

Erin Hodgson
June 10, 2016 7:36 AM

Yesterday, my lab crew went to the ISU Northeast Research Farm near Nashua, Iowa to assess plant stands and take initial aphid counts in my efficacy evaluation trial. My technician found five wingless soybean aphids in a V1 plant. This was certainly interesting, as it could mean uniform colony...

Crop Production, Insects and Mites

Meaghan Anderson
June 7, 2016 3:53 PM

Virgil Schmitt
June 7, 2016 3:53 PM

After a busy week at a meeting in Michigan, Virgil Schmitt and I visited the Muscatine County farmer with Palmer amaranth to assess the population.

This farmer first discovered Palmer amaranth...

Weeds

Clarke McGrath
June 7, 2016 10:22 AM

Most of the corn is around V3 to V6, with some of the replant corn popping up with the heat. I think (hope) I saw my last replanted corn being put in yesterday, some wet spots that had dried out on the edges of some bottom fields.

Spraying corn
A lot of corn...

Crop Production

John Sawyer
June 6, 2016 6:01 PM

Most of Iowa has not received high precipitation amounts this spring, however, some regions have–most notably western Iowa (see maps). Wet springtime conditions typically raise the question about the status of applied nitrogen (N).

Soil Fertility

Jody Korthaus
June 6, 2016 5:24 PM

The USDA Crop Progress Report from Monday, June 6, shows corn planting 100% complete in Iowa, with 97% of corn emerged. The agency report has Iowa's corn crop at a 80% good/excellent rating. Soybean planting is 94% done, ahead of last week's 88% and the five-year-average...

Crop Production

Mark Hanna
June 6, 2016 11:53 AM

Increasing sprayer travel speed causes the controller to increase boom pressure (and decrease droplet size). If field conditions have you running behind and your sprayer travel speed has increased 20–25%, consider using one size larger nozzle tip to minimize drift potential.

Equipment and Machinery, Pesticide Education

Erin Hodgson
June 2, 2016 12:28 PM

Today, I heard about some armyworm feeding on corn in northeast and northwest Iowa. In the NE Iowa field, rye was planted last fall and killed late this spring. Armyworms tend to be aggregated, or found in big groups, and can cause significant injury seemingly overnight. The caterpillars are...

Crop Production, Insects and Mites

Erin Hodgson
May 27, 2016 7:54 AM

Although most of my research projects are outside, I occasionally do work in growth chambers and greenhouses. This week, I started a seed treatment evaluation for soybean. I'm looking at 12 different treatments and seeing how soybean aphid responds. Working in more stabilized conditions takes...

Insects and Mites

Bob Hartzler
May 27, 2016 6:27 AM

Researchers at the University of Illinois recently published a paper identifying the PPO resistance mechanism in Palmer amaranth.  It turns out that both Palmer and waterhemp have an unusual type of mutation providing resistance to the group 14 herbicides (PPO inhibitors).  Rather than a...

Herbicide Resistance

Paul Kassel
May 26, 2016 3:13 PM

A lot of farmers worked some long hours to complete fieldwork over the weekend because of the predicted rainy weather. There have been some heavy rains in extreme northwest Iowa early this week, but much of my area has missed those heavy rains. And, as a result, a lot of fieldwork was completed...

Crop Production

Bob Hartzler
May 26, 2016 7:12 AM

Plants with yellow flowers are a common sight in roadsides and other grassy areas as one drives across Iowa at this time of year. There's a good chance these plants are one of the weedy mustards (wild mustard, yellow rocket, hedge mustard, etc.), golden alexander, or wild parsnip. The mustards...

Weeds

Erin Hodgson
May 25, 2016 10:00 AM

Yesterday, I was asked to help confirm an identification of a few beetles in a cornfield near State Center, Iowa. They ended up being striped and spotted cucumber beetles. Sometimes the striped cucumber beetle can be confused with western corn rootworm; however, it would be unlikely to see adult...

Insects and Mites

Bob Hartzler
May 24, 2016 12:56 PM

While I don't have a bucket list of weeds, it's always nice to find a new one. Today I had my first encounter with blue mustard (Chorispora tenella). Like all mustards, this plant has four petals, but the petals of blue mustard are pink to purple in color and very narrow, relative to...

Weeds

Jody Korthaus
May 23, 2016 2:57 PM

A lot of soybean planting progress was made across the state this past week, as farmers tried to get ahead of this week's daily rain forecast. Most corn planting has been completed in Iowa, with 75% already emerged, according to the May 23 USDA Crop Progress Report....

Crop Production

Meaghan Anderson
May 20, 2016 12:29 PM

Alison Robertson
May 20, 2016 12:29 PM

Several corn fields in southeast Iowa are having disease issues this spring. After visiting with several ag retailers and farmers, I had Alison Robertson and Tom Kaspar, a plant physiologist with the USDA-ARS, out yesterday to look at some fields with issues. When we put all the pieces together...

Plant Diseases

Bob Hartzler
May 20, 2016 9:47 AM

I've had several questions on how long to wait following the frost event this past weekend before making a postemergence application. The answer depends on several factors, including 1) stage of corn at frost injury, 2) vigor of corn at time of frost, 3) weather following the frost, and 4)...

Weeds

Bob Hartzler
May 19, 2016 1:08 PM

While driving to a field plot in Webster County earlier this week I saw a land roller being used in a field. My first thought: "If we have time to roll fields, why is there such resistance to the suggestion of mechanical weed control?"

Most farmers of my age have memories of long days on...

Weeds

Bob Hartzler
May 18, 2016 6:26 AM

Scouring rush and field horsetail are two species in the Equisetum genus. These are primitive plants that produce spores rather than seeds, but they spread primarily by underground rhizomes. Until recently these two weeds were found primarily in roadside ditches, but the reduction in...

Weeds

Paul Kassel
May 16, 2016 1:52 PM

My area has a real range of conditions with corn planting 65-75% complete in the northwest part of my area. There is maybe 15% of the soybean crop planted in the northwest part of my area. The corn and soybean planting progress is 95%+ complete in the northeast part of...

Crop Production

Mark Licht
May 16, 2016 8:51 AM

Temperature is the key for both corn and soybean. Temperature below 28oF for a couple of hours will be lethal to growing tissue that has emerged. Temperatures between 28oF and 32oF will result in definite frost injury to above ground tissue. And temperatures...

Crop Production

Erin Hodgson
May 16, 2016 8:41 AM

As Merle Haggard said in his song, Under the Bridge, “you’ll find some great grub feedin’ here below.” I got a couple calls about grub injury in seedling corn last week and how to identify annual grubs (e.g., masked chafers and Japanese beetle) from true white grubs (May and June beetles) with a...

Crop Production, Insects and Mites

Joel DeJong
May 13, 2016 11:16 AM

In the NW corner of Iowa it has, once again, been a wet week. There have even been localized rains as high as 6" for the week, although most received significantly less. Getting back to planting, it's has been difficult, and we are lagging the rest of the state in planting progress. We aren't...

Crop Production

Jody Korthaus
May 9, 2016 4:47 PM

Iowa has 80% corn planted as of May 8, according to Monday's USDA Crop Progress Report, up from 57% the previous week. The report shows that soybeans planted also made a notable jump from 7% complete on May 1 to 29%.

Many farmers were able to get back in the fields this weekend with a...

Crop Production

Clarke McGrath
May 6, 2016 4:08 PM

I've been getting a lot of questions about needing additional N for corn; growers are torn between putting some UAN in with herbicides vs. spreading urea. I’d caution them against using UAN as a carrier on emerged corn if they are applying herbicides. Yes, there are a few products that allow...

Crop Production, Soil Fertility

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