Our research on cover crops has focussed on the use of marigolds (Tagetes spp.) to control root-knot nematodes (Meloidogyne spp.). In greenhouse experiments marigold varieties were identified with high efficacy in nematode control. Subsequent field tests showed that selected marigold varieties, grown prior to a susceptible crop, lowered nematode populations and increased yields similar to soil fumIgation.
Ploeg, A.T. 2000. Effects of amending soil with Tagetes patula cv. Single Gold on Meloidogyne incognita infestation of tomato. Nematology 2:489-493.
Ploeg, A.T., and P.C. Maris. 1999. The effect of soil temperature on the life cycle and reproduction of Meloidogyne incognita on tomato and marigold. Nematology 1:389-393.
Ploeg, A.T., and P.C. Maris. 1999. The effect of soil temperature on the suppression of Meloidogyne incognita by Tagetes cultivars. Supplement to Journal of Nematology 31(4S):709-714.
Ploeg, A.T. 1999. Greenhouse studies on the effect of marigolds (Tagetes spp.) on four Meloidogyne species. Journal of Nematology 31:62-69.