I have read several publications about the root, knot nematodes in the Southeastern part of the United States where cotton and soybeans are often rotated. In the midwest, cyst nematodes are the main culprit and most are found in soybean planted soils.
In fact, one article indicated that if you have a garden and you discover nematodes, you should immediately decide to move your garden somewhere else or consider a raised garden.
Rotating crops is one way to help reduce the population of nematodes in your soil. Consider testing your soil to see if nematodes are present in your soil. The ideal time is in the fall, but many growers test their soil for nematodes when the ground temperature gets above 55 degrees farenheit.
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