Does marigold suppress all plant-parasitic nematodes?
No. It suppresses root-knot nematodes, lesion nematodes, and possibly reniform nematodes, but increases others such as, stubby-root, spiral, sting, and awl nematodes (Tables 1 and 2). In addition, different varieties of marigold may react differently to different root-knot nematodes. Furthermore, especially for root-knot nematodes, new species that have recently been discovered or remain undiscovered may increase on or damage marigold species/varieties that are proven to be resistant to other well-known nematode species.
