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in Problem solving
Are you sure it is eel worms?
Eel worm infections normally happens end ot the summer months or early autumn,
I do not think the eel worms were in the sets when you bought them because eel worms infections acure when it is very damp.
best to dig up and burn the onions sets but the worms could be in the soil as well,depending on the size of the area you could use a weed burner to heat the soil up and kill the eel worms in the soil.