Fusarium odoratissimum

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Fusarium odoratissimum - A) culture PDA, B+C) sporodochia on carnation leaves, D+E) sporodochial branched conidiophores with monophialides, F) false head, G) falcate-shaped macroconidia, H) microconidia, I) chlamydospores, J) polyphialides - scale bars D–J = 10 mm (click to enlarge)
Author(s): N. Maryani, L. Lombard, Y.S. Poerba, S. Subandiyah, P.W. Crous and G.H.J. Kema
Source: Studies in Mycology (2019) 92, p. 177

Fusarium odoratissimum N. Maryani, L. Lombard, Kema & Crous 2019

This fungus is one of more than 10 species from the Fusarium oxysporum species complex which cause the Panama disease of banana. It has been previously referred to as "Fusarium oxysporum f.sp. cubense tropical race 4" or TR4 (Ordóñez et al., 2019). This race is economically very important because it can infect the Cavendish cultivar, a cultivar which has been mainly developed because of its resistance to the Panama disease and is widely grown in banana exporting countries.

F. odoratissimum or TR4 is common in south-eastern Asia, but has spread to other regions in spite of quarantine restrictions in many countries. Of almost 200 strains from the Fusarium oxysporum species complex, collected from diseased banana trees in Indonesia by Maryani et al. (2019), more than half were assigned to F. odoratissimum. Apart from Indonesia and neighbouring countries, F. odoratissimum and TR4 have now been reported from China, Taiwan, Pakistan, the Indian subcontinent, the Near East, parts of Africa and most recently from Latin America, see Ploetz (2015), Maryani et al. (2019), Ordóñez et al. (2019), and Stokstad (2019).

There is no commercially acceptable banana germplasm to replace Cavendish, other than Cavendish somaclones that are partly resistant to TR4 (Ordóñez et al., 2019). Apart from infecting banana plants, F. odoratissimum has been also isolated from Albizia trees in Iran (Lombard et al., 2019).

The above literature records (top left) include other publications dealing with "Fusarium oxysporum f.sp. cubense tropical race 4" and with the Panama disease in Indonesia.