Erin Hodgson

Dr. Erin Hodgson started working in the Department of Entomology at Iowa State University in 2009. She is a professor with extension and research responsibilities in corn and soybeans. She has a general background in integrated pest management (IPM) for field crops. Dr. Hodgson's current extension and research programs are focused on improving corn and soybean production by using IPM tactics to protect yield and increase overall farmer profits. Among other projects, she oversees insecticide efficacy evaluations for soybean aphids, Japanese beetles, and aphids in corn. Erin also helps manage emerging field crop pests and invasive species. 

Photo of Erin Hodgson
May 23, 2017 12:49 PM

In 2017, ISU is reporting black cutworm (BCW) peak flights by county and providing degree day resources for more personalized cutting prediction dates using actual accrued degree days for a specific location. We first reported on BCW peak flights in the...

Insects and Mites
May 12, 2017 3:33 PM

You might not think insects would make great parents, and in general, you would be correct. Most species just drop eggs and keep moving. But there are a few species, particularly true bugs (Hemiptera), that do try to protect their young. Parental care ranges from hiding eggs, to providing food,...

Insects and Mites
May 9, 2017 8:37 AM

grub body partsThis week, a couple Iowa crop consultants reported grubs are easy to find this spring. I assume they are digging in crop soils to evaluate seed germination. Last...

Crop Production, Insects and Mites
May 5, 2017 2:33 PM

multicolored Asian lady beetle life stagesThe multicolored Asian lady beetle, also known as Harmonia axyridis, is a common insect in the ag landscape and...

Crop Production, Insects and Mites
May 1, 2017 3:03 PM

insect spiracleThe recent wet weather in Iowa has prompted people to ask me if insects can breathe under water. In short, most...

Insects and Mites
April 25, 2017 11:39 AM

degree day map for alfalfa weevilA couple weeks ago, I posted an ICM News article talking about...

Crop Production, Insects and Mites
April 18, 2017 12:27 PM

Iowa State University Extension and Outreach is helping Iowa farmers manage weeds, insects and diseases in their fields.

Pest management is key to high yields and quality grain. ISU Extension and Outreach specialists are working to provide the tools and resources farmers need to manage...

Insects and Mites, Plant Diseases, Weeds
April 10, 2017 11:32 AM

I recently posted an ICM News article about how scouting for alfalfa weevils in southern Iowa. It doesn't take too many accumulated degree days for them to start moving around...

Crop Production, Insects and Mites
March 30, 2017 8:27 AM

Yesterday, the EPA announced it will not proceed with any restrictions for a commonly-used insecticide, chlorpyrifos. This includes no changes to chlorpyrifos tolerances in the U.S. In 2015, a petition to revoke chlorpyrifos was submitted to the EPA by the Natural Resources Defense Council (NRDC...

Crop Production, Insects and Mites
February 21, 2017 11:06 AM

In 2011, brown marmorated stink bug (BMSB) was first confirmed in Cedar Rapids, Iowa. Since then, live detections have been confirmed in 19 Iowa counties. These stink bugs have been found in and around human structures, mostly homes in urban areas. I don’t know of any BMSB specimens found in...

Crop Production, Insects and Mites
December 2, 2016 8:29 PM

This week during ICM Conference, I talked about a resistance management plan for soybean aphid. My presentation abstract can be downloaded now (ICM Proceedings, pg. 97...

Insects and Mites
October 17, 2016 1:03 PM

There is a lot of discussion lately about grain storage and quality. I wanted to make you aware of webinars that may be of interest to you. I was part of a regional project that organized a 4-part webinar series focused on stored grain IPM in the north central region. Here are the topics and...

Grain Handling and Storage
October 6, 2016 11:11 AM

Many people have been asking me about little black bugs biting them this summer. Have you experienced this? I would have to guess they would be minute pirate bugs, also known as insidious flower bugs.

Insects and Mites
October 5, 2016 2:05 PM

Right now, I have five different insects walking around my office! Of course, they are accidental invaders along with many other nuisance pests active right now. It’s also a sign of the quality of the building I work in [sigh]. I’ve been asked several times, “how cold does it have to get to...

Insects and Mites
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
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
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
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
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
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. 

Crop Production, Insects and Mites
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
June 14, 2016 11:03 AM

I recently had a call about millipedes feeding on corn kernels in northeast Iowa this week. The farmer had a 120-acre cornfield with approximately 20 percent stand loss associated with millipede feeding. I rarely hear about millipedes as field crop pests, but a couple factors likely played a...

Crop Production, Insects and Mites
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
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
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