Anyone have problems like this in a container?

I have read that the nematodes can be transferred from gardening tools and also if the pots are placed directly on the soil instead of on concrete or paving stones.

I'm no expert... I haven't seen them in person, but it looks like what I'd expect.

I believe when I looked at a list, Snap Dragons were listed high as a plant that is susceptible to root knots so when I saw this I was like ohhh....

I learned the hard way, no pots directly on the ground. I was even told that if the cement ground or block has a crack they will go into the pot.

Good luck!

Jane