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Bob Hartzler
July 29, 2016 7:51 AM

Iowa Code 317 is the section of the Iowa Code that defines the Iowa Noxious Weed Law.  Chapter 317.1 is the piece of legislation that actually defines which...

Weeds

Paul Kassel
July 28, 2016 9:59 AM

A recent visit to a field with three different planting dates showed the varied crop progress in my area.

The Useful to Usable website uses local information...

Crop Production

Bob Hartzler
July 25, 2016 12:35 PM

Japanese knotweed is one of the most difficult weeds to eradicate due to its extensive woody root system.  In England it is notorious for caving in basement walls where it was planted as a foundation plant.  At least 15 years ago I discovered a 'nice' patch of Japanese bamboo along the banks of...

Weeds

Erin Hodgson
July 25, 2016 8:48 AM

ISU Field Agronomists around the state have noted Japanese beetle feeding injury in corn and soybean over the last week. Japanese beetles have a wide host range that includes many species of fruit and vegetable crops, ornamentals, and field crops. Adults prefer to feed between soybean leaf veins...

Insects and Mites

Alison Robertson
July 21, 2016 3:24 PM

This past week I have been busy with disease diagnostic workshops at the ISU Field Education and Extension Laboratory. For those of you who have attended my sessions before, you know that I usually have a quiz that consists of leaves with various diseases and disease look-a-likes or imposters. I...

Plant Diseases

Erin Hodgson
July 21, 2016 8:24 AM

The lowest level of insect injury where damage can be measured is called the damage boundary. The damage boundary is a biological relationship between the insect, crop, and environment; and is independent of input costs (e.g., seed, insecticide, etc.). Managing a pest below the...

Insects and Mites

Mahdi Al-Kaisi
July 20, 2016 5:19 PM

This spring consisted of wet field conditions for many regions across Iowa during planting season. When soil moisture is at or exceeds field capacity, there is an increased potential for soil compaction, particularly at topsoil depths. Soil compaction at planting time can impact root growth and...

Soil Management

Erin Hodgson
July 19, 2016 7:17 AM

Soybean aphid feeds fluids within the phloem fluids (sometimes referred to as "sap") by inserting piercing-sucking mouthparts directly into the phloem vessels. Prior to feeding, aphids "taste" the sap to determine if the plant is a suitable host species and if the quality is acceptable. Once...

Insects and Mites

Bob Hartzler
July 18, 2016 11:14 AM

I’ve seen more people walking beans and had more comments about it than I can remember in a long time.  Perhaps it's time for Greg Brown to re-release his classic ‘Walking the Beans’, first released on ‘The Iowa Waltz’ album in 1981....

Weeds

Bob Hartzler
July 13, 2016 1:56 PM

The current epidemic of wild parsnip has garnered much attention due to the toxins present in the plant.  Since wild parsnip is a biennial, mowing is often recommended as a control option.  The theory is that by preventing seed production, mowing can eliminate future infestations.  In practice,...

Weeds

Angie Rieck-Hinz
July 8, 2016 7:54 AM

About twice a year I get asked these questions. "Angie, what are you doing to promote cover crops in north central Iowa? We just don't have many acres of cover crops up there." Or, "Angie, what can we do to get more cover crops in north central Iowa?" I usually chuckle at these questions, and...

Crop Production

Erin Hodgson
July 8, 2016 6:53 AM

Western corn rootworm (WCR) and northern corn rootworm (NCR) eggs overwinter in the soil and larval hatch is based on accumulated degree days (ADD) of soil temperatures each year. Average hatching dates for Iowa are in early June, with southern counties experiencing egg hatch before northern...

Insects and Mites

Edward Zaworski
July 7, 2016 11:24 AM

Since the last clinic update (6/17/2016), we are starting to transition from seedling diseases to foliar diseases. There is quite a bit of concern from clients about getting an early jump on foliar diseases, in order to plan for foliar fungicide applications. Similarly to the last blog, a...

Plant Diseases

Meaghan Anderson
July 7, 2016 9:51 AM

Storms hit eastern Iowa yesterday, bringing variable amounts of rainfall and enough wind to blow some corn down. The damage seems to extend across multiple counties, but I witnessed many fields with varying amounts of damage in Linn and Jones counties.

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Crop Production

Rebecca Vittetoe
July 7, 2016 8:53 AM

Spider mites the end of June or first part of July? Our hot and dry weather here in southeastern Iowa have provided favorable conditions for spider mites. Typically we do not see spider mites reaching economically damaging levels until late July or early August when conations (hot and ry) are...

Insects and Mites

Bob Hartzler
July 6, 2016 7:36 AM

Wild parsnip is a biennial that was introduced to North America by the earliest European colonists, it is documented to have been grown in Virginia as early as 1609. In his 1913 book The Weed Flora of Iowa, L. H. Pammel described wild parsnip as ‘common on roadsides in every part of...

Weeds

Erin Hodgson
July 5, 2016 11:01 AM

Last week, my lab crew found a few different caterpillars feeding in our soybean plots at the ISU Northwest Research Farm. They were hesitant to identify it in the field, so they brought one to me for a confirmation. First, I noticed it had a green body and green head and four pairs of prolegs...

Insects and Mites

Erin Hodgson
June 29, 2016 12:25 PM

This week, I got a note from Tristan Mueller (Iowa Soybean Association) seeing some corn leaf injury from redheaded flea beetle. The defoliation was noticeable and the farmer was considering a foliar insecticide. The fields did not have tasseled yet and he estimated 5-6 beetles per plant. 

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Crop Production, Insects and Mites

Jody Korthaus
June 27, 2016 5:32 PM

The USDA Weekly Crop Progress Report on Monday, June 27, showed Iowa's corn crop condition as unchanged from last week's 79% good/excellent rating. Soybean emergence in Iowa is 99%,...

Crop Production

Erin Hodgson
June 27, 2016 4:22 PM

Earlier this month, I wrote an ICM News article showing peak corn rootworm egg hatch in Iowa. That means at least 50% of viable eggs have likely hatched and larvae will start feeding...

Insects and Mites

Jody Korthaus
June 24, 2016 3:39 PM

Thursday, June 23, brought great weather and a good crowd to the Northern Iowa Research Farm Field Day near Kanawha, Iowa, and the Southeast Research and Demonstration Farm Spring Field Day near Crawfordsville, Iowa; both hosted by Iowa State University (ISU) Extension and Outreach....

Crop Production

Joel DeJong
June 22, 2016 2:07 PM

On Friday evening of last week (June 17), a storm system rolled through the northwest corner of Iowa. Winds with this system were clocked in the 70+ mph range, and one weather station measured wind gusts over 100 mph. Many large trees were snapped off, grain bins damaged, and other facilities...

Crop Production

Jody Korthaus
June 20, 2016 5:11 PM

Iowa Crop Progress Summary

The USDA Weekly Crop Progress Report stated Iowa's corn crop has a good/excellent rating of 79%, above the current national average of 75%. The agency reported all of Iowa's soybeans as planted and 97% emerged, ahead of the 5-...

Crop Production

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