Management of Meloidogyne incognita, the root-knot nematode, on soybean as affected by marigold and sea ambrolia (damsisa) plants

Marigolds (Tagetes erecta and T. patula) or sea ambrosia (Ambrosia maritima) as intercropped plants with soybean (Glychie max) cv. Giza 21 infected with Meloidogyne incognita, the root-knot nematode, significantly (P less than or equal to 0.05 and 0.01) reduced nematode numbers on soybean as indicated by the percentage reduction of galls, developmental stages and egg masses in roots and juveniles (J2) in soil. Marigolds significantly (P less than or equal to 0.05 or 0.01). in most cases, increased plant growth parameters of soybean, but sea ambrosia had an adverse effect on plant growth parameters. Addition of chopped green leaves of sea ambrosia to the soil planted to soybean significantly (P less than or equal to 0.05 and/or 0.01) reduced M. incognita reproduction and development. Sea ambrosia also had an adverse effect on soybean plant growth.