Cole crops are typically grown in cooler areas on higher value land where it is profitable and possible to grow two to three crops per year which makes a crop rotation program less desirable. This graph of fluctuations of the number of eggs sugarbeet cyst nematode on a series of crops demonstrates how a crop rotation program functions. The graph begins at the harvest of a host crop. As a series of nonhosts are planted such as lettuce and tomatoes, the number of eggs per gram of soil drops. When cabbage, which is a host, is planted, the number of eggs increases once again.
Numbers fall once again under a series of nonhosts such as squash, fallow, lettuce, and beans.