| LOCATION | SOIL TEMP. (F) | EGGS/GRAM OF SOIL | REFERENCE |
| IMPERIAL VALLEY,CA | 58.1-95.0 | 1.0-2.0 | COOKE & THOMASON, 1979 |
| RUPERT, IDAHO | 41.0-75.3 | 1.6-2.9 | GRIFFIN, 1981 |
| PARMA, IDAHO | 42.8-80.6 | 2.9-4.2 | GRIFFIN, 1981 |
| SUFFOLK, ENGLAND | 39.0-62.1 | 10.0-20.0 | COOKE & THOMASON, 1979 |
Damage thresholds for sugarbeet cyst nematode are typically developed in terms of eggs/gram of soil. Although having to extract eggs from cysts adds a time consuming and therefore costly step to the extraction process, this has been found to be necessary becauce cysts have been shown to recoverable in fields for many years longer than eggs.
This table provides examples of how greatly the damage threshold for nematodes can vary from one location to another. In general, it is thought that the lower the soil temperature at the time of planting, the higher the damage threshold.
The goal of a crop rotation program is to grow nonhost crops until populations have dropped below the damage threshold.