Nematologist's Comment
The nematologist will report the molecular diagnosis results here. On the report, you can find the comments in the area outlined in red.
Action Codes
Take the letter in the Action Code column and correspond it with the action that is to be taken.
For example, since the letter in the column is "C", it would correspond with Action C: Chemical treatment recommended
A. No expected harm to crop production
B. Possible damage; consider chemical treatment
C. Chemical treatment recommended
D. Use of nematode-resistant variety recommended
E. Rotate with nonhost crop(s)
Nema Notes (if present)
Contain information about nematodes detected in the assay as well as management options.
If there is a number listed in the Nema Notes column, go to the Useful References page to find the corresponding Nema Note.
Ex: Below Nema Note 9 is referenced, so on the Useful References page, find Nema Note 9. You can select "print" to view the larger PDF and/ or print it off.
"S" and "H" Columns
Each pair of columns resides below the species of nematode found in the assay.
Column S = # nematodes per 500 cc soil
Column H = # hazard index for crop.
Nematode Counts & Hazard Index (potential crop damage)
The value in the “H” column is an index of potential harm by the nematode species to the crop listed on the same line:
Hazard index:
0-19 Very Low
20-39 Low
40-59 Moderate
60-79 High
80-100 Very High
So what does this mean?
In the example given above, root-knot nematodes were found in Sample ID 41836.
Looking at the Root-knot nematode column:
- There were 1000 nematodes per 500 cc of soil.
- The hazard index is 35-60 which means Low to High for the crop (Irish potato) indicated for this sample.
- Action Code is C: Chemical treatment recommended.
- Nema Note 9: Root-knot Nematodes on Irish Potatoes
This page was last modified on 03/30/2026