Does my carrots have nematodes?

[thistlebloom]

Not all nematodes are bad, some are beneficial in targeting damaging pests.
A quick google came back with this:
http://www.biologicco.com/orgpage.htm

 

[hoodat]

There is even a nematode that climbs the stems of tomatos in wet weather (actually it swims in the water film) and burrows into leaves and branches.
Root nematodes are harmless in your body. They cannot live there.