INTERACTIONS BETWEEN TANNIA (XANTHOSOMA-SAGITTIFOLIUM) AND THE ROOT-KNOT NEMATODES, MELOIDOGYNE-MEGADORA AND MELOIDOGYNE-JAVANICA

Research was conducted to: 1) evaluate the host suitability of tannia to Meloidogyne megadora and M. javanica and 2) investigate the activit y of corm extracts of tannia against these species. M. megadora failed to reproduce in tannia obtained either by vegetative or in vitro prop agation. Tannia obtained by vegetative propagation also was a non-host for M. javanica, but plants produced through in vitro propagation all owed development and some reproduction. Few M. megadora J2 penetrated tannia roots 2 days after inoculation (DAI) and there was no further d evelopment. M. javanica J2 penetrated the roots but development was su ppressed. Only one female with eggs was observed 45 and 60 DAI and adu lt males (3) were first observed 35 DAI. Tannia corm extract inhibited hatching and caused mortality of M. megadora dose-responsively.