Root-knot nematode Meloidogyne incognita (RKN), a key pest infecting noni (Morinda citrifolia) plantations cultivated as intercrop in coconut gardens in coastal states of India. One alternative to using nematicides to protect the affected crop is to plant marigold (Tegetes erecta) as an antagonistic crop to suppress nematode populations in infested soil. Therefore, field experiments were conducted with marigold seedlings planted in different numbers at noni tree basins to reduce RKN and minimize the plant mortality. The result indicated planting six marigold plants around the Noni tree basin from June to December suppressed the M. incognita population up to 89.7% with a significant increase in the number of branches (175%) and yield (264.6%) over control, indicating efficacy in managing the nematodes and also showing better plant vigor in coconut gardens. Moreover, the mortality rate of noni plants decreased from 22.07% to 3.9. The present finding confirms that planting of marigold plants around noni plant basins plays a significant role in the management of M. incognita infesting noni plantations cultivated intercropped in coconut gardens. These results would have the potential to develop comprehensive integrated plant parasitic nematode management strategies.