Research: Host Status and Green Manure Effect of Selected Crops on Meloidogyne chitwoodi Race 2 and Pratylenchus neglectus

Abstract

The suitability of selected crops as hosts of Meloidogyne chitwoodi race 2 and Pratylenchus neglectus was evaluated in greenhouse and field microplots. Host status was based on reproductive factor (Rf = Pf/Pi). Sudangrass cv. Hidan 36 (Sorghum vulgare var. sudanense) and all oil radish (Raphanus sativus L.) cultivars were maintenance hosts (1 Rf 3). All buckwheat (Fagopyrum esculentum Moench) cultivars, rapeseed (Brassica napus L.) cv. Humus, sudangrass cv. Trudan 8 and cv. Sordan 79, horsebean (Canavalia ensiformis L.), velvetbean (Mucuna deeringiana Bort.), castorbean (Ricinus communis L.), and corn (Zea mays L.) were either poor or nonhosts (Rf 1) for M. chitwoodi. Most crops tested were either good hosts (Rf 3) or maintenance hosts (1 Rf 3) for P neglectus, but buckwheat cv. Tardo, horsebean, and velvetbean were poor hosts for P. neglectus. Stems and leaves of crops were incorporated as green manure into sterile soil in greenhouse pots. Pots were inoculated with M. ch