RATE OF POPULATION DECLINE:

• NEEDED TO ESTIMATE NUMBER OF YEARS OF ROTATION NEEDED
• ROOT KNOT - RAPID (1-2 YEARS)
• CYST - SLOW (3-8 YEARS)
• STEM & BULB - SLOW (4 YEARS)
• LESION - ?

Crop rotation programs function because, under nonhost conditions, nematodes will starve to death. The time required for starvation is different for different nematodes and for many has not been studied. Some examples are given in the table above. The economics of a program in which a profitable host crop can be grown every other year, for example, is different from one in which a host can only be grown every 8 years.

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