Race and resistance studies on two Italian populations of Hetyerodera avenae

Twenty five near-isogenic lines of wheat, oat and barley were tested far their resistance to two ltalian populations of Heterodera azmnaein a glasshousee xperiment. Ali of the lines were resistant to both populations, which were identified as pathotype Ha51 (from Basilicata) and Ha41 (from Sardinia), with the possibility that the latter might be one of the Spanish pathotypes Ha 71 or Ha 81.