Menu

Is Your SCN Management Intervention Working?

As the soybean harvesting is winding down, questions are being asked as to what may have caused lower than expected yields for some soybean fields. One of the causes of reduced yields could be the soybean cyst nematode (SCN). The SCN can cause yield losses even when no visual symptoms are seen on soybean plants. There is one way to determine if SCN is causing yield losses: sample your field and send soil in for SCN test. Testing for SCN is free for SD producers, thanks to the South Dakota Soybean Research and Promotion Council who sponsors the test.

Testing for SCN serves two purposes: to determine if SCN is present and to determine if management practices are lowering its numbers. Fields that are to be planted into soybean the next growing season (now under corn or other crops) should be tested for SCN in order to determine whether a SCN resistant cultivar will be needed or to change in the SCN management strategy.

If SCN population density is still high (>12,000 eggs per 100 cm3 of soil), it is important consider an extended rotation away from soybeans (at least two years). If SCN population density is medium (between 2,000 and 12,000 eggs per 100 cm3), use a resistant cultivar and also practice crop rotation. Where SCN population density is low (<2,000 eggs per 100 cm3), use a resistant cultivar as well as crop rotation to prevent the population density from increasing. It is easier to keep the SCN population density in the soil low than to bring a high SCN population density down.

There is still some time left to sample soil for SCN before the ground freezes. Soil sampling can be accomplished using a tilling spade or a soil probe. Target depth is the top 6 inches of soil from 20 spots in zig-zag pattern including low spots, field entrance areas, along the fence line, and low yielding areas. Larger fields (>20 acres) should be divided into smaller portions of 15-20 acres and each of these sampled individually.

Producers who farm in counties that have been detected with SCN but do not yet have it in their fields ought to know how it spreads and avoid chances of its introduction into clean fields. This applies also to producers in counties that do not yet have SCN detected but are surrounded by counties that have tested positive. Spreading is through anything that moves SCN-infested soil: farm machinery, water/wind soil erosion, muddy shoes, and wild animals. Soil movement on tillage, planting, or spraying equipment should be avoided and SCN positive fields should be worked on last.

Source: iGrow

Recent News

Fall-applied Herbicides-What Goes Around Comes Around
9/22/2020

Fall herbicide treatments have fallen off over the past several years for a couple of reasons, among them the effectiveness of new soybean trait systems for managing marestail, some generally crappy weather in late fall, and efforts to reduce input costs.  We are seeing a resurgence in some weeds, such as dandelion, which respond well […]

New Round of Farm Aid for COVID Losses Announced, and Causes Snag in Congressional Spending Bill
9/22/2020

Andrew Restuccia and Jesse Newman reported in Friday’s Wall Street Journal that, “President Trump unveiled $13 billion in new aid to farmers facing economic harm from the coronavirus pandemic as he aimed to boost support among rural voters at a campaign rally. ‘I’m proud to announce that I’m doing even more to support Wisconsin farmers,’ said Mr. Trump, speaking outside […]

Corn Silage Needs Adequate Moisture to Ferment
9/18/2020

Early season frost is challenging for corn silage producers, according to Karl Hoppe, Extension livestock systems specialist at NDSU’s Carrington Research Extension Center. Frost makes an abrupt end to the corn-growing season. This begins the dry-down period for the corn plants. “Good corn silage fermentation requires adequate moisture to reduce dry-matter loss and spoilage,” Hoppe […]

Your browser is out-of-date!

Update your browser to view this website correctly. Update my browser now