The reaction of 41 banana cultivars to black leaf streak, black cross spot and rust was studied at the Koronivia Research Station in Fiji. Cultivars of AA, AAA, AAAA , AAB and BB genetic constitution were represented in the banana collection. The commercial triploids were very suceptible to black leaf streak while some of the diploids and some of the local cooking bananas could be classified as moderately susceptible. None of the cultivars showed any very marked resistance to black leaf streak and results were generally similar to those reported from a study in Hawaii. Only cultivars containing the B genome were susceptible to black cross spot. Rust was particularly prevalent on some of the diploids but is not considered to be a serious disease problem.