The Bulletin Archives - Page 45 of 79

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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Corn Growth Stage and Postemergence Herbicides

May 30, 2018
Aaron Hager

The labels of most postemergence corn herbicides allow applications at various crop growth stages, but almost all product labels indicate a maximum growth stage beyond which broadcast applications should not be made, and a few even a state minimum growth stage before which applications should not be made. These growth stages are usually indicated as a particular plant height or leaf stage; sometimes both of these are listed. For product labels that indicate a specific corn height and growth state,…

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Glume Blotch in Wheat

May 24, 2018
Chelsea Harbach

The following is posted on behalf of Dr. Nathan Kleczewski, Field Crops Pathologist for Growmark. This content is from the Field Crop Disease Hub webpage Dr. Kleczewski curated.
This week we have had several reports of Stagonospora glume blotch in wheat. This is a fairly common disease that is caused by the fungus Stagonospora (or Parastagonospora) nodorum.
The fungus overwinters in/on previously infested wheat residue, and can also be found in infected seed. …

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New Crop Protection Network Publication on Proper Fungicide Use for Fusarium Head Blight Now Available

May 23, 2018
Nathan Kleczewski

The Crop Protection Network is a free, online resource for producers and those in the agronomic community interested in diseases of field crops and their management. Recently, CPN started adding resources to the site to include diseases of small grains such as wheat. As part of this effort, we published a publication on how to optimize fungicide applications for Fusarium Head Blight management. The publication can be accessed for free at the CPN library …

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Tips on diagnosing diseases and other issues in the field

May 19, 2018
Chelsea Harbach

The following is posted on behalf of Dr. Nathan Kleczewski, Field Crops Pathologist for Growmark. This content is from the Field Crop Disease Hub webpage Dr. Kleczewski curated.
Now that the field season is upon us, it is a good time to go over some tips and tricks for diagnosing field issues. One item that I always mention to CCA’s and others involved in field-level work is that identifying a disease in the field is not always straight forward. …

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Diagnosing disease related issues in the field

May 18, 2018
Nathan Kleczewski

Well, it is that time of year where we start to see issues developing in the field. Questions such as, “What happened?” and “Why me?” will become more common. The key to managing diseases is proper diagnosis, and this starts in the field. In my recent post on the Field Crop Disease Blog, I provide several tips for diagnosing issues in the field, and distinguishing disease related problems from abiotic issues. Check out the post,…

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A fast start for the 2018 crop

May 18, 2018
Emerson Nafziger

We worried our way through the cool month of April, with 32 percent of corn and only 7 percent of soybean acres planted by April 29, and nothing emerged. During the first two weeks of May, the weather was warmer and drier than normal, and adding together corn and soybeans, Illinois farmers planted more than a million acres for each of the 10.3 “days suitable for fieldwork” between April 29 and May 13.
By May 13,…

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Black Cutworm: Management Considerations in Corn

May 18, 2018
Nick Seiter

With corn planting wrapping up throughout most of Illinois, the time has come to scout for cutworms. While several species of cutworms infest early season corn, black cutworm (Agrotis ipsilon) is the most likely to cause economic damage. We have received a handful of reports of cutting in southern Illinois, with more expected in the coming weeks as heat units begin to accumulate. If you are not doing so already, follow Kelly Estes’s reports on the Bulletin and through Twitter (@ILPestSurvey) for up to date information on black cutworm moth flights and degree-day accumulations.…

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Insect Trapping Update:Week Ending May 11, 2018

May 11, 2018
Kelly Estes

Black cutworm
Black cutworm moth flights continue across much of Illinois. Several counties reported second -and even third- significant moth flights (Madison, Champaign, and Lee). Several counties had near significant flights (Piatt and Coles). It is important to remember that lack of a reported significant flight and subsequent projected cutting dates does not take black cutworm out of the equation in your area. I have had reported of 1st-2nd instar feeding and even a report of 3rd-4th instar cutting in a couple areas of the state.…

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Tips for optimal use of FHB Risk Tool

May 10, 2018
Chelsea Harbach

The following is posted on behalf of Dr. Nathan Kleczewski, Field Crops Pathologist for Growmark. This content is from the Field Crop Disease Hub webpage Dr. Kleczewski curated.
One of the hallmarks of the United States Wheat and Barley Scab Initiative was the development of the Fusarium Head Blight Prediction tool (or FHB Risk Tool). This tool represents over 15 years of research conducted by plant pathologists around the country. Several versions of the tool have been made available,…

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