whitefly + French marigolds: it doesn't work

[Two_Sheds]

Well, it's worked every year for me except this year (or perhaps this is just a very, very bad year for whitefly).

Anyway, I weeded the sprouts, under their net, and was suffocated by clouds of the little beggars: up my nose, down my throat, in my hair.

And to taunt me, they were all clustered all over the French marigolds, (a dozen plants, interplanted with sprouts) because the sprout leaves were full up.