Viewing post #2490763 by sooby

Hortaholic said:
I'll note here for anyone who doesn't read it that it says 'Tangerine' marigold appears to be especially effective, while Signet is *not*. I find this confusing because I can't locate a marigold named Tangerine. There is a 'Tangerine Gem' which is a Signet variety. These are Tagetes tenuifolium. It does say that French marigolds in general are effective.

From this article from North Carolina Dept of Agriculture, sounds like they mean Tagetes patula 'Tangerine' (Table 1). "Tagetes signata cv. Tangerine Gem, for example, will not control root knot......Use a marigold variety known to be Tagetes erecta or T. patula."

Root-knot Nematodes: Biocontrol with French Marigold
http://www.oisat.org/downloads...

Tagetes patula 'Tangerine'
https://www.seedaholic.com/tag...