How Do Marigold Roots Suppress Nematodes in Soil?
Marigold roots release toxic thiophenes into the rhizosphere over 65–105 days — and nematode suppression can persist more than two years after the plants are gone. Tagetes marigolds suppress soil nematodes through a combination of thiophene root exudates, trap-crop effects, and rhizosphere chemistry shifts that accumulate over weeks of growth. That sentence doesn’t sound dramatic, … Read more