Table 2. Illustration of the potential effectof rotation with nonhost crops for up to 7 years on sugar beet cyst nematode populations. In this example, a hypothetical field has an initial nematode population of 15 viable eggs and larvae per 1 cm³ soil in Year 0 (the year sugar beet or another host was planted). A 40% rate of decline is calculated for each subsequent year that nonhosts are planted.

Estimated number of viable eggs +

Year after a sugar beet crop

Larvae remaining per 1 cm³ soil

0

15.0

1

9.0

2

5.4

3

3.2

4

1.9

5

1.2

6

0.7

7

0.4