Root-knot nematodes (Meloidogyne spp.)
Various species of Meloidogyne cause galls or swellings on the fleshy tap-root. In warm climates M. incognita, M. javanica and M. hapla are the main species causing problem. The disease is a problem in carrots grown in sandy soils.
- Plant resistant hybrids where available.
- Practice crop rotation with cereals and fodder grasses.
- A 3-year stop for all Apiaceae and Chenopodiaceae crops and a 4 to 5 year stop for legumes is needed to interrupt the life-cycle of these nematodes.
- Soil amendments with neem cake or extracts are recommended.
- Where feasible, practice at least 1 year fallow cultivation.