Abstract:
Three anthracnose diseases, caused by three different Colletotrichum spp., of importance
in South Africa were studied. Anthracnose of Lupinus a/bus was recorded for the first time
and the causal organism described as C. tortuosum Koch & Baxter. Chamaecyticus
palmensis was added to the host range of C. trifolii. Differential Phaseolus vulgaris
cultivars were used to distinguish seven races of C. lindemuthianum. None of 30 local
bean cultivars showed resistance to the races of the fungus present in South Africa.
Different methods for the detection of C. lindemuthianum on bean seed were evaluated.
The paper doll method was found the most effective. Various fungicides were evaluated
for their effectiveness to control seedbome C. lindemuthianum. Benomyl was found to be
the most effective.
