Abstract
Seven legume crops and 18 associated weed species in maize-based, mixed crop small-holdings in Malawi were evaluated as hosts for Meloidogyne javanica in pot experiments. Plants were inoculated with the nematode by applying a water suspension of 2000 (for crops) or 3000 (for weeds) juveniles around the seedling roots. Host suitability was assessed, relative to a susceptible tomato variety, on the basis of severity of galling, number of mature females per g of root and number of eggs per egg sac. With the exception of groundnut (Arachis hypogaea), all the legume crops tested were able to support nematode reproduction to some extent. Bambara (Voandzeia subterranea) was the most susceptible host. French bean (Phaseolus vulgaris) was also susceptible, while chickpea (Cicer arietinum), cowpea (Vigna unguiculata) and soya (Glycine max) were moderately good. Pigeonpea (Cajanus cajan) was a poor host. Several of the weed species were able to support the nematode and two of these, Ageratum conyzoides and Nicandra physaloides, could be considered to be good hosts.
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