yes bt is definitely organic. i never heard of marigolds to deter thw but i have read they deter nematodes.
bt is so easy and effective why mess around with other things that may not work unless you want to have marigolds. i sprayed and the thw are all gone. i often don't have any thw in some seasons but if i do they seem to come appear one time and not again so i think i'm done with them... but i'll still watch.
tom
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