Companion Planting with Tagetes erecta Reduces Nematode Load 67% in Organic Tomato Production
Hooks C, Wang KH, Ploeg A
Soil Health
It means you can protect your homegrown tomatoes from invisible soil pests just by planting marigolds nearby — no pesticides, no special equipment, just smarter gardening.
Researchers found that growing marigolds next to tomatoes dramatically reduces tiny soil worms called nematodes that attack plant roots and stunt growth. Marigolds naturally release a substance from their roots that kills these pests. As a result, the tomato plants grew better and produced 18% more fruit than tomatoes grown alone.
Key Findings
Intercropping marigolds with tomatoes reduced root-knot nematode populations by 67%
Tomato yields improved by 18% compared to monoculture (tomatoes grown alone) controls
Alpha-terthienyl, a compound released from marigold roots, was identified as the primary nematode-killing agent
chevron_right Technical Summary
Planting marigolds alongside tomatoes cuts harmful soil nematode populations by 67% and boosts tomato yields by 18%, offering a simple, chemical-free pest control strategy for organic growers.
Abstract Preview
Intercropping marigolds with tomatoes in organic systems reduced root-knot nematode (Meloidogyne incognita) populations by 67%. Alpha-terthienyl from marigold root exudates was the primary nematici...
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