MYTH 1: COMPANION PLANTING
Plenty of gardeners, books and websites will tell you that planting marigolds among tomatoes will deter whiteflies and kill root-feeding nematode worms. But I have never seen any evidence or scientific studies to support this.
Whiteflies are tough little devils and are resistant to most insecticides so I can't see a whitefly raising an eyebrow (if it had one) at a whiff of marigold.
from
http://www.stuff.co.nz/life-style/home-property/83208704/5-myths-about-organic-gardening
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