Nematode risk thresholds for peanut

A = nematodes are not likely to cause crop damage
B = borderline populations in which crop damage may occur if other factors stress the crop
C = populations are likely to cause crop damage and a significant loss of yield

 Risk code based on nematodes/500cc soil (August 1 to November 20 of year before planting crop)

Nematode

A
(little or no risk)

B
(moderate risk)

C
(high risk)
Root knot

<25

25-100

>100
Dagger

<100

100-280

>280
Sting

0

10-20

>20
Lesion

<30

30-100

>100
Ring

<40

40-200

>200
Spiral

<300

>300

--
Stubby root

<100

100-300

>300
 

 pmphipps@vt.edu
  bkeeling@vt.edu