Insects

Feedback sought on Pest Degree Day Calculator Upgrade

  • February 20, 2019

  • Kelly Estes


The Illinois Degree Day calculator has been available to Illinois producers since 2004. Hosted by the Illinois Climate Network (ICN), this pest management tool was developed to help aid producers in monitoring insect development throughout the growing season and aid in pest management decisions.
The calculator uses weather data from 19 network stations across Illinois to provide degree day accumulations and forecasts for 30 agricultural and invasive pests based on long-term averages. While this has been a great resource for many years,…

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What effect will cold temperatures have on pests and pathogens?

  • February 10, 2019

  • Nathan Kleczewski

Nathan Kleczewski Research assistant Professor and Extension Field Crop Pathologist
Nick Seiter- Research Assistant Professor and Extension Field Crop Entomologist
 
Many in the Illinois agricultural community are wondering what effects the recent extreme cold might have on pests and pathogens. While it would be nice if the cold temperatures we are experiencing could help to reduce our potential for pest damage, past experience tells us that the most serious pests we deal with are unlikely to be impacted much by these conditions.…

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Field Performance of Seed Treatments and Soil Insecticides for Corn Rootworm Control

  • January 29, 2019

  • Nick Seiter

Authors: Nick Seiter and Joe Spencer
Producers across east-central Illinois have enjoyed low western corn rootworm pressure for several years, due to a combination of saturating rains during rootworm egg hatch and widespread use of Bt corn hybrids. Following a low point in the rootworm population in 2015, statewide monitoring of corn and soybean fields has documented a slow western corn rootworm population rebound in some areas.  Recent low corn pest abundance (combined with lower commodity prices) provides an opportunity to become reacquainted with rootworm monitoring and non-Bt options for their management.…

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Despite local Bt resistance, growers still have options

  • January 18, 2019

  • Joe Spencer

The development of resistance to Bt Cry toxins by the western corn rootworm is a growing concern, highlighted by the recent confirmation of field-evolved resistance to Cry34/35Ab1 in Iowa (https://www.agriculture.com/crops/corn/why-managing-corn-rootworm-just-became-more-complicated). Across the Corn Belt there are western corn rootworm populations with resistance to multiple Bt Cry toxins expressed in Bt corn. In Illinois, Bt resistance can be found in western corn rootworms from both continuous and first-year cornfields; rotation-resistant populations are vulnerable to Bt resistance.…

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Dectes Stem Borer and Lodged Soybeans

  • November 28, 2018

  • Nick Seiter

Many soybean growers have had problems with lodging at harvest this year. The primary culprit for this (as for many of our woes this fall) was the extended period of unfavorable weather that we have suffered. However, in parts of southern Illinois damage by the dectes stem borer contributed to this problem.
The adult dectes stem borer (Figure 1) is a “long-horned” beetle that can often be found in soybean and on other plants. The adult female chews a hole into the surface of the plant (usually at the petiole),…

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And the Survey Says…

  • September 17, 2018

  • Kelly Estes

 
For those that attended Agronomy Day this past August, the title and above graphic may look familiar. As field and research season winds down, we’re able to finish collecting and summarizing data. One of our biggest summer projects is the annual corn and soybean survey. While some of that information was shared at Agronomy Day, the complete results are summarized below.
As a recap, this survey has been carried out across the state for several years (2011,…

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Soybean Gall Midge: New Pest of Soybean in Nearby States

  • September 4, 2018

  • Nick Seiter

Producers in Nebraska, Iowa, and South Dakota have been dealing with gall midges in soybean. This is a fly in the family Cecidomyiidae, which is the same family as the Hessian fly, sorghum midge, and several other agricultural pests. We have not confirmed any infestations of this insect in Illinois at this time; the closest confirmed, damaging infestations that I know of are in western Iowa. However, because so little is known about the biology of this insect,…

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Ewing Demonstration Center Celebrates 50 years of Continuous No-till Research at Agronomy Field Day on July 26

  • July 12, 2018

  • Nathan Johanning

The University of Illinois Extension will host the Ewing Demonstration Center Agronomy Field Day on Thursday, July 26, 2018 at 9 a.m.  Every growing season presents challenges to production, and this year is no exception!  We are happy to host this summer field day to share with local growers current, ongoing agronomy research in southern Illinois, including cover crop trials on corn and soybeans, nitrogen management in corn, weed management in soybean, and our continuous no-till field,…

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Western Corn Rootworm: Adult Sampling and Economic Thresholds

  • May 30, 2018

  • Nick Seiter

Authors: Nick Seiter, Joe Spencer, and Kelly Estes
Based on degree day accumulations, western corn rootworm egg hatch should be underway in much of Illinois (roughly south of Peoria as of May 29; you can view your specific location using the degree day calculator here: https://www.isws.illinois.edu/warm/pestdata/sqlchoose1.asp). We are probably just over a month away from seeing the emergence of the first adult beetles. With low rootworm populations for the last several years, there has been a renewed interest in adult sampling.…

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