Blog

Mark Licht
June 25, 2020 1:09 PM

Zachary Clemens
June 25, 2020 1:09 PM

 M. Licht).
Leaf ripples and yellowing shortly after the whorl unfurls...

Crop Production

Rebecca Vittetoe
June 23, 2020 10:13 PM

Spotty rainfall across the state, herbicide drift, “Rapid Growth Syndrome” in corn, and shorter beans were common issues or concerns that ISU Extension Field Agronomists saw and heard about this past week. Read on for more specifics about what’s happening in different regions across the state....

Crop Production

Mark Licht
June 23, 2020 9:40 AM

Many farmers and agronomists are noticing short soybean this spring. Some are pondering if there is something that can be done to spur some additional growth as flowering is fast approaching, if not already begun. The surprise with short soybean is that planting was timely. The unfortunate...

Crop Production, Equipment and Machinery

Alison Robertson
June 22, 2020 3:27 PM

Over the weekend there have been several reports of bacterial leaf streak (BLS) of corn in eastern Iowa.  The infections also appear to be quite severe (Figure 1).

...

Plant Diseases

Joel DeJong
June 22, 2020 1:17 PM

There have been reports of flowers in the earliest planted soybeans, and I observed them in NW Iowa late last week. That means these beans are entering the R-1 stage of development. If you have a history of white mold in your soybeans and are considering treatment for reducing the impact of this...

Plant Diseases

Terry Basol
June 18, 2020 4:40 PM

Temperature Inversions

It is never recommended to spray a pesticide when a temperature inversion exists, and many labels provide guidelines to follow in order to avoid applications during one. This blog will discuss what temperature inversions are, why they can be...

Crop Production, Pesticide Education, Weeds

Erin Hodgson
June 18, 2020 3:56 PM

Today, with Ashley Dean and Angie Rieck-Hinz, I met Warren Pierson at FEEL to look for corn rootworm larvae. I predicted peak corn rootworm egg hatch for central Iowa this week based on accumulating degree days. We had no trouble finding larvae in refuge corn, ranging from ¼ to ½ inches in...

Crop Production, Insects and Mites

Zachary Clemens
June 17, 2020 3:58 PM

Laura Jesse Iles
June 17, 2020 3:58 PM

The growing season is in full swing, and as Iowa growers and gardeners move along toward the Fourth of July, it is important to remember that the COVID-19 precautions continue to alter operations at the Iowa State University Plant and Insect Diagnostic Clinic (PIDC).

The PIDC continues to...

Plant Diseases

Rebecca Vittetoe
June 16, 2020 9:26 PM

Reports of soybean gall midge adults emerging, rainfall or lack of rainfall, weed management concerns, and herbicide drift were some of the common issues or concerns that ISU Extension field agronomists saw or heard about this past week. Read on for more about what's happening in specific...

Crop Production

Sotirios Archontoulis
June 15, 2020 10:18 AM

Mark Licht
June 15, 2020 10:18 AM

Zachary Clemens
June 15, 2020 10:18 AM

Radiation is down up to June 1 according the latest FACTS extrapolations.

The springtime decreases in radiation—especially in May—could have caused yellowing corn leaves and slowed down leaf appearance rates (radiation and moisture play a role in phenology, even though temperature is the...

Crop Production

Erin Hodgson
June 12, 2020 3:45 PM

Today, ISU entomology graduate student, Mitchell Helton, captured the first adult soybean gall midge in Iowa. Just a few hours later, cooperator Lauren Botine (Corteva Agriscience), collected another adult. Currently, our traps are placed in fields infested with soybean gall midge in 2019. There...

Crop Production, Insects and Mites

Rebecca Vittetoe
June 9, 2020 8:46 PM

Sidedressing nitrogen, post emergence herbicide applications, and putting up hay were the main field activities that took place over this past week across the state. Some of the issues ISU Extension and Outreach field agronomists saw this past week ranged from dry conditions in the western part...

Crop Production

John Sawyer
June 9, 2020 3:23 PM

Yellowing of corn plants early in the season can be confusing to diagnose. And in some conditions there may be a period of time after corn emergence where small corn just does not look good. There can be a number of causes for plant yellowing. An example is the description in a recent ICM Blog...

Soil Fertility

Bob Hartzler
June 9, 2020 1:59 PM

Meaghan Anderson
June 9, 2020 1:59 PM

One important benefit of cover crops to our production system is providing an alternative selection pressure on weed populations. Cereal rye has the best potential to suppress weeds because it accumulates more biomass than other cover crop species.  Weed suppression is closely related to the...

Weeds

Bob Hartzler
June 5, 2020 6:47 AM

Prashant Jha
June 5, 2020 6:47 AM

Meaghan Anderson
June 5, 2020 6:47 AM

Numerous herbicides registered for postemergence use on Xtend soybean have excellent activity on important weeds of Iowa’s soybean fields. Unfortunately, herbicide resistance in waterhemp is widespread to the herbicide groups active on this weed: Group 2 (ALS inhibitors), 9 (glyphosate) and 14 (...

Herbicide Resistance

Alison Robertson
June 4, 2020 9:52 AM

Earlier this week I was out in corn fields "helping" my lab crew collect disease data.  The corn was not looking great but hopefully it has perked up with the past few days of sun and warmth. I know I have!

I noticed in my corn-on-corn fields anthracnose leaf blight on the lower leaves of...

Plant Diseases

Ashley Dean
June 3, 2020 9:59 AM

The trapping season for true armyworm (TAW) and black cutworm (BCW) has come to an end. We appreciate our cooperators for tirelessly checking traps the last two months and reporting their captures so we can provide the most accurate scouting information for these pests. To recap, we had 36...

Crop Production, Insects and Mites

Rebecca Vittetoe
June 2, 2020 3:57 PM

The crops have really started to take off this past week with the warmer temperatures. While rainfall limited field activity in parts of the state, where fieldwork could be done many got started on sidedressing, post herbicide applications, and putting up hay. Yellow and uneven corn, weed...

Crop Production

Bob Hartzler
June 2, 2020 10:10 AM

Although there is no evidence of widescale problems with carryover injury to corn or soybean, ISUEO field agronomists have received a few reports. The potential for carryover injury is determined by several factors, including: 1) persistence of the herbicide, 2) herbicide rate, 3) soil...

Weeds

Terry Basol
June 1, 2020 1:45 PM

In order to keep up with any changes and updates on pesticide uses and restrictions from year to year, it’s important to thoroughly read the label before any applications are made, even if the same product was used the previous year. If nothing else, it helps to refresh our memory on the...

Crop Production, Weeds

Dr. Erin L Bowers
May 28, 2020 2:58 PM

Charles R Hurburgh
May 28, 2020 2:58 PM

Iowa State’s Dr. Charles Hurburgh will be presenting on the topic “Ongoing Impacts from the 2019 Harvest and Early 2020 Crop Forecast” as an installment in the Grain Elevator and Processing Society’s...

Grain Handling and Storage

Ashley Dean
May 27, 2020 5:17 PM

More large flights of moths were reported across Iowa last week. In fact, the statewide weekly totals for both true armyworm (TAW) and black cutworm (BCW) far exceeded those of previous weeks. Across the state, our cooperators reported a total of 243 TAW moths and 188 BCW moths between May 17...

Crop Production, Insects and Mites

Rebecca Vittetoe
May 27, 2020 3:33 PM

Last week brought little sunshine, cooler temperatures, and soggy conditions across much of the state. Yellow-looking corn, slow growing crops and forages, and uneven or poor stand establishment were some of the common concerns ISU Extension field agronomists have been hearing and seeing. Read...

Crop Production

Meaghan Anderson
May 26, 2020 11:03 AM

While all applicators should carefully read their pesticide labels, newer products like the dicamba products labeled for use over-the-top use in soybean have many more application restrictions and recordkeeping requirements than others. This blog will describe the new language in the ‘...

Pesticide Education, Weeds

Erin Hodgson
May 22, 2020 11:59 AM

Ashley Dean
May 22, 2020 11:59 AM

Meaghan Anderson
May 22, 2020 11:59 AM

Thanks to ISUEO Field Agronomist Meaghan Anderson and Extension Entomologist Ashley Dean, I had a great field scouting adventure in central Iowa. First visiting the field for poor germination and other issues, Meaghan was digging in the soil in search of more information and found grubs! So of...

Crop Production, Insects and Mites

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