Surveys indicate that 75% of our soybean fields are infected with soybean cyst nematode (SCN).
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This parasitic roundworm attacks the soybean plant causing injury to the root system and reducing crop yields.
Surveys of growers indicate that less than 62% of the growers feel they do not have any yield loss from this pest. Also, only 64% of the growers have ever tested for soybean cyst nematode.
Soybean cyst nematodes are commonly found in our local fields. As the survey indicates, many growers do not feel that cyst nematode is affecting yields. This pest, however, is commonly reducing yields.
Soybean yields may decrease slowly for a number of years before the reduction becomes obvious. Suspect fields usually have plants of different heights, but environmental conditions may make stunting less obvious. Yields drop and may be half of that of healthy fields.
When you soil sample, this is a good time to check for soybean cyst nematode. Take large number of cores to make a composite sample. A good sample will be about a quart of soil. Keep samples to represent ten acres or less.
Low yielding soybeans in a field with good soil and fertility indicate cyst nematode may be a problem. You may want to target such areas for sampling. Nematode samples can be sent to MU for analysis through your local Extension office.
For more information, contact Wayne Flanary, Regional Agronomist, University of Missouri Extension at 660-446-3724.