Review: Effect of Fresh and Dry Organic Amendments on Meloidogyne arenaria in Greenhouse Experiments


  • C. H. S. P. Ritzinger
  • R. McSorley


Brassica oleracea, Castor, Collard, Hibiscus esculentus, Mucuna deeringiana, Mulch, Okra, Ricinus communis, Root-Knot Nematode, Sesame, Sesamum indicum, Sorghum, Sorghum bicolor, Velvetbean, Zinnia, Zinnia elegans


Organic amendments (OA) were evaluated in two greenhouse experiments for their effectiveness in suppressing Meloidogyne arenaria populations in naturally infested soil. Vegetative shoots from castor (Ricinus communis), collard (Brassica oleracea), sesame (Sesamum indicum), sorghum (Sorghum bicolor), velvetbean (Mucuna deeringiana), and zinnia (Zinnia elegans) were chopped into small pieces and placed on the soil surface in plastic pots. Nematode numbers and growth of 'Clemson Spineless okra (Hibiscus esculentus) planted into each pot were evaluated. In a winter experiment, 4 g of the fresh OA or 4 g of the dried OA were used as separate treatments. Dried OA was more effective than fresh OA, and greatest reduction of juveniles (J2) in the root system was obtained with dry OA from zinnia, castor, velvetbean, and collard. In a summer trial, 4 g of dry OA and the fresh weight of each OA corresponding to 4 g dry weight did not differ in their ability to reduce J2. Castor and velvetbean ga