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Pests

Resistance is showing up in weeds, insects and disease pathogens in Iowa and has the potential to impact yields, increase the cost of production, and limit farmers’ future
pest management options.

Examples of Resistant Weeds

Common cocklebur, common lambsquarters, common sunflower, giant foxtail, giant ragweed, horseweed, Kochia, Pennsylvania smartweed, waterhemp, and recently, Palmer amaranth.

Examples of Resistant Insects

Western corn rootworm, also soybean aphid populations near, but not yet inside, Iowa.

Examples of Resistant Diseases

Soybean cyst nematode and frogeye leaf spot.

Pilot projects will be selected from these pest options and will be used to inform management option strategies as well as collaborative efforts within communities to resolve resistant pest issues.

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What is the Iowa Pest Resistance Management Plan?

The Iowa Pest Resistance Management Plan (IPRMP) is an Iowa-specific plan to address pests--including weeds, insects and diseases--that can adapt and become resistant to chemical, genetic, and agronomic control practices. The IPRMP outlines approaches for effective, integrated management solutions that will sustainably control pests. By fostering methods to detect resistance, resistance can be delayed or even prevented, limiting the spread of pest resistance.

IPRMP Questions and Answers

Click here to learn more about the IPRMP. 

Version 1 of the IPRMP is here

IPRMP Introduction--Webinar Recording

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Managing White Mold in Soybean

July 7, 2014

Farmers in the Midwest may be concerned about white mold (also called Sclerotinia stem rot) in soybean this year. The disease, caused by the fungus Sclerotinia sclerotiorum, is not common every year, but farmers who have battled the disease in the past will want to assess the risk of white mold development as soybeans approach flowering (growth stage R1 – plants have at least one open flower at any node).

Risk of Sudden Death Syndrome Increasing with Rains

July 7, 2014

One thing we have learned from outbreaks of sudden death syndrome (SDS) in years past is that this disease likes it wet. Last year we wrote about the risk of SDS  increasing with the early season rain. But at the end of the article we threw in one caveat – soybeans were planted very late in the season, which reduced the risk of SDS developing. And after we published the article, the rains essentially stopped. Fast forward to the end of the 2013 season -- we still had some SDS in parts of Iowa in 2013, but it was not as nearly as bad as it could have been.

Grasshopper Activity Observed

July 23, 2014

Grasshopper activity has been noted this week in Iowa. These insects feed on grasses and weeds, and can become field crops pests. In corn and soybean, feeding is frequently, but not always, restricted to field edges. When crop injury does occur, it usually is related to drought conditions due to a reduction in natural vegetation.

Northern Leaf Blight Prevalent in Iowa

July 23, 2014

Northern corn leaf blight (NCLB) has been reported in numerous fields in Iowa.  Most of the reports have come from central and western Iowa, but since the pathogen that causes this disease is spread by wind and rain, the disease could be more widespread.

 

Mid-Season Update on Fungicides and Corn Diseases

July 23, 2014

We continue to receive several questions about Northern corn leaf blight, Goss’s wilt and fungicides. Here is some additional information.

Basics of fungicides

Parts of rural Iowa are abuzz about fungicide use to manage some emerging diseases, and we have received several questions about the basics of fungicides. A quick reminder, APS PRESS recently published a book geared towards farmers and agronomists on the basics of fungicides.

Iowa Pest Resistance Management Plan Unveiled

January 30, 2017

Iowa Pest Resistance Management Plan logo

DES MOINES – Iowa Secretary of Agriculture Bill Northey, Iowa State University College of Agriculture and Life Sciences Associate Dean John Lawrence and Iowa farmer Larry Buss of Logan today announced the release of the Iowa Pest Resistance Management Plan. A video of the announcement is available here.

Version 1 of the IPRMP is an Iowa-specific plan that seeks to engage farmers on the issue of pest resistance management with the goal of keeping technology and tools such as pesticides, seed treatments and biotechnology products and native traits available and effective.

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