Vegetative compatibility amongst isolates of Colletotrichum causing lupin anthracnose

Isolates of Colletotrichum pathogenic on Lupinus spp, were characterised by vegetative compatibility analysis with two vegetative compatibility groups (VCGs) being identified. Isolates of Colletotrichum from North America and France belonged to VCG-1 whereas isolates of Colletotrichum collected in W estern Australia during an outbreak of anthracnose on lupin seed imported f rom Germany in 1994 belonged to VCG-2. VCG-2 was also shown to occur in Chi le where it possibly first originated. Complementation tests with putative isolates of Colletotrichum gloeosporioides from other hosts provided no evi dence that either VCG-1 or VCG-2 otherwise occurs in Australia. L. angustif olius cv. Illyarrie, reputedly resistant to anthracnose, was not resistant to VCG-2 in glasshouse tests.