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Quick Guide to Soybean Varieties for Iowa with Peking SCN Resistance

November 28, 2023
SCN-resistant soybean varieties in maturity groups 0-1 with Peking SCN resistance

Iowa State Extension recently released a newly updated list of soybean varieties that are resistant to the soybean cyst nematode (SCN). The publication contains information on 87 varieties with SCN resistance from the breeding line Peking. Varieties with Peking resistance often will provide greater control of SCN and higher yields in SCN-infested fields that have had varieties with PI 88788 SCN grown for decades. This article contains tables that provide a quick look at the brands, names, and relative maturities of the Peking varieties.

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Updated SCN-resistant Soybean Variety List Has More with Peking Resistance than Ever

November 20, 2023
Number of varieties.

Each year, Iowa State University prepares a list of soybean varieties available in Iowa that are resistant to the soybean cyst nematode (SCN). The list was updated in October 2023 and the publication is now available online. There are 48 more varieties in the 2023 list than in 2022 including 40 more with Peking SCN resistance. Varieties with Peking resistance are highly useful for managing SCN because they limit reproduction of most Iowa SCN populations and protect against yield loss more effectively than varieties with the common PI 88788 resistance.

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New Data-Based Calculator Estimates Economic Yield Loss from SCN in Individual Fields

November 10, 2023
The results screen of the SCN Profit Checker.

The soybean cyst nematode (SCN) is estimated to cost soybean producers $1.5 billion annually in North America. A new online resource called the SCN Profit Checker, from the SCN Coalition, uses data collected from Iowa State University research to estimate percent yield loss from SCN and the cost of yield reductions in dollars lost in individual farmer fields. This article explains more about this resource, where to access it and how to use it.

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Fall is Prime Time to Sample Fields for SCN

November 6, 2023
Soybean roots grown in windblown soil recovered from a snow drift. SCN females are the small cream-colored objects on the roots (yellow arrows).

The soybean cyst nematode (SCN) is the most damaging pathogen of soybeans in Iowa and the entire US, costing producers $1.5 billion annually. The pathogen warrants more attention and effort to detect and manage than often is given. It is easily detected and quantified from soil samples. An optimum time to collect soil samples from fields is immediately after corn and soybean harvest are complete. This article explains why and how to collect and submit soil samples for SCN testing.

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NEW Corn and Soybean Field Guide Available Now

October 18, 2023 3:14 PM
Blog Post

An updated Corn and Soybean Field Guide is now available from Iowa State University Extension and Outreach.

This 236-page pocket-sized guide (3-3/4" x 6") combines corn and soybean integrated pest management information in one publication for ease of use by corn and soybean farmers, agronomists, and crop scouts. It has newly updated text and images and provides tools for identifying insects, diseases, and disorders of corn and soybean in the Midwest. The guide also contains information on developmental stages, pesticide decisions, and other production-related topics.

Why is my corn black?

September 29, 2023 8:43 AM
Blog Post

I have had several calls and emails about corn turning black – particularly the husks and leaf tissues. Walking in these fields turn a white shirt black quickly, and not surprisingly, combining this blackened corn can be very dirty. 

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Crop standability an issue this fall

September 12, 2023 11:40 AM
Blog Post

Harvest is approaching too quickly this fall. Between the dry summer and the spurts of hot weather in August and early September, crop standability is degrading quickly. This blog will go over some potential reasons for standability issues and ways to assess and prioritize fields for harvest.

The crop just ran out of gas

Scout now, save later- The importance of season-long scouting

September 7, 2023 12:54 PM
Blog Post

Field crop health matters throughout the entire growing season. The types of diseases on crops depend on the point in the growing season and the environmental conditions. Many later-season diseases result from soilborne pathogens over which in-season fungicide applications have no control. Most commercial varieties will have ratings for the performance of their selections against various diseases, including those caused by soilborne pathogens.

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