Blog

Alison Robertson
April 15, 2016 11:12 AM

A couple of weeks ago in a blog post, I shared with you some research we are doing on the effects of cold stress on soybean susceptibility to seedling...

Plant Diseases

Meaghan Anderson
April 14, 2016 10:05 AM

John Sawyer
April 14, 2016 10:05 AM

It seems that anhydrous ammonia (AA) applications and planting may fall very close together on the timeline of events this spring. This could be concerning with drying soils and lack of significant rainfall chances in the near future.

Important notes to remember:

1) Application...

Crop Production, Soils, Soil Fertility

Mark Licht
April 11, 2016 2:08 PM

Planting season is or soon will be underway. This presents an opportunity to talk about a few things; 1) ideal conditions for planting, 2) seeding depth, and 3) imbibitional chilling.

Planting conditions
Ideal planting conditions are when the soil temperature...

Crop Production

Erin Hodgson
April 11, 2016 1:53 PM

In March, I posted a blog about alfalfa weevils laying eggs in SE Iowa. Degree days have been slowly accumulating in April. I've updated the degree day map for 2016 and alfalfa weevils should be...

Crop Production, Insects and Mites

Bob Hartzler
April 9, 2016 12:36 PM

A 'true' weed ecologist probably would have shuddered at my explanation to young 4-H'ers how weeds survive our control efforts:  
1) shake them off (giant ragweed) or 2) overrun them with numbers (waterhemp).

...

Weeds

Clarke McGrath
April 7, 2016 8:58 PM

I've had a lot of questions/discussions this week about planting corn. I had some growers get started Monday, some others were going to start towards the middle or tail end of this week, a few were going to wait until Monday, and a few were undecided. When to start planting was probably...

Crop Production

Erin Hodgson
April 5, 2016 1:39 PM

Adam Sisson
April 5, 2016 1:39 PM

Bean leaf beetle adults are susceptible to cold weather and most will die when the air temperature falls below 14°F (-10°C). However, they have adapted to winter by protecting themselves under plant debris and loose soil. An overwintering survival model developed at ISU in 2000 is helpful for...

Insects and Mites

Bob Hartzler
April 5, 2016 8:13 AM

The rapid spread of herbicide resistant weeds threatens the current Midwest production system. Introduction of new herbicide resistance traits will provide additional management options for resistant-prone weeds such as waterhemp, giant ragweed, and marestail; however, these systems must be used...

Herbicide Resistance

Alison Robertson
April 4, 2016 2:31 PM

Mauricio Serrano
April 4, 2016 2:31 PM

Research can be frustrating. For the past 5 years, my lab has been evaluating seed treatments on soybean. In an effort to detect an effect of seed treatment on soybean stand and yield, in 2015 we planted our trials very early (mid-April). A few days later, it rained, soil temperatures dropped...

Plant Diseases

Angie Rieck-Hinz
March 28, 2016 4:45 PM

As I did some reading in preparation of writing this blog, I found there are various definitions of soil health. And I am sure for as many definitions as there are, we each have our own ideas as to what defines soil health. The USDA-NRCS Soil Health web page defines soil health as "the continued...

Soil Management

Erin Hodgson
March 28, 2016 8:52 AM

You may have heard of brown marmorated stink bug (BMSB), an invasive insect making its way across the U.S. The first live detections of BMSB in Iowa were in 2011. Laura Jesse, Director of the Plant and Insect Diagnostic Lab, has now confirmed BMSB in 12 Iowa counties (see a map...

Crop Production, Insects and Mites

Clarke McGrath
March 25, 2016 6:10 PM

Meaghan and Bob’s blog posts on weeds, and seeing a floater spraying yellow herbicide in 30 mph winds on Monday, reminded me to do an update on our newest problem child in the weeds world, Palmer amaranth. While we hoped that the few infestations scattered across Iowa could be contained,...

Weeds

Erin Hodgson
March 24, 2016 11:37 AM

Adult alfalfa weevils begin moving as soon as temperatures exceed 48°F and begin laying eggs in alfalfa. Alfalfa weevil eggs develop based on temperature, or accumulating degree days, and hatching can start around 200-300 degree days. Start scouting alfalfa fields south of Interstate 80 at 200...

Crop Production, Insects and Mites

Meaghan Anderson
March 17, 2016 11:51 AM

Spring seems to have sprung early this year with the beautiful weather and very warm temperatures. I like to take a lap around the office on the Johnson County Fairgrounds a few times during the...

Weeds

Daren Mueller
March 16, 2016 7:15 PM

Alison Robertson
March 16, 2016 7:15 PM

Alison and I spent the week editing the nearly final version of two national publications about corn and soybean diseases. These will be published by our society, APS Press, like the Fungicides for Field Crops ...

Plant Diseases

Bob Hartzler
March 16, 2016 10:37 AM

While walking through the Memorial Union a painting caught my eye. The resemblance between Palmer amaranth seedheads and the artwork was striking, my photography skills not so much.

...

Weeds

Erin Hodgson
March 15, 2016 2:44 PM

I was curious to compare growing degree days (GDDs) over the last couple summers. It seemed like 2014 and 2015 were cool, wet springs with a slow start for insects. But I wanted to check actual temperature history instead of relying on my memory. I used the ISU Agronomy...

Crop Production, Insects and Mites

Erin Hodgson
March 14, 2016 3:19 PM

While going through the extension winter gauntlet, I talked a lot about corn rootworm. It is one of most important pests in the Midwest and should be on your mind when deciding on hybrids and insecticides. I often got questions about using stacked and pyramided corn hybrids, and there seemed to...

Crop Production, Insects and Mites

Bob Hartzler
March 13, 2016 7:29 AM

Question: What was the most popular POST herbicide program for corn in Iowa Crop Reporting Districts 1 and 2 (NW and NC Iowa) in 1985?

Answer: 2,4-D + Banvel (dicamba), with 78 and 64% of the acres treated, respectively.

Every time I see an...

Weeds

Erin Hodgson
March 8, 2016 8:58 AM

Generally speaking, warmer winters mean more insects are likely survive because they aren’t exposed to lower lethal temperatures. An early spring can also benefit insects, particularly those species we consider field crop pests, because they are physically larger when crops emerge and can cause...

Crop Production, Insects and Mites

Erin Hodgson
March 4, 2016 10:15 AM

It’s not easy for insects to survive Iowa winters. Some literally can’t - they freeze to death or migrate away to warmer climates. But many insects have adapted to cold temperatures by entering diapause, which is like hibernation. Diapause is a developmental arrest to survive adverse seasons...

Insects and Mites

Erin Hodgson
March 3, 2016 11:45 AM

Many of you know about naturally-occurring entomopathogens in the soil that can kill or suppress insects. Bacillus thuringiensis (Bt) is a well-known example of a bacteria that kills insects, and was eventually included in plants as a transgenic protein. My Ph.D. student, Eric...

Crop Production, Insects and Mites

Mark Licht
March 3, 2016 10:48 AM

The deadline for farmers to submit data for the "Soybean Yield Benchmarking Project" has been extended to April 1, 2016.

The “Soybean Yield Benchmarking Project” is a collaborative effort and is funded by soybean checkoff funds through the North Central Soybean Research...

Crop Production

Bob Hartzler
February 28, 2016 9:11 AM

The overwintering monarch population in Mexico was reported last week and has increased for the second consecutive year (Figure 1). Four hectares of forest (9.9 acres) were covered with monarchs, up from the low of 0.7 hectares in the winter of 2013-14. While this is good news,...

Insects and Mites

Meaghan Anderson
February 25, 2016 2:23 PM

Bob Hartzler
February 25, 2016 2:23 PM

This is fourth and final part of a series focused on using multiple, effective herbicide groups at effective rates as part of a long-term weed management system.

...

Herbicide Resistance

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