TR4 in Mayotte

Sunday, 09 August 2020

The first report of tropical race 4 (TR4) in the French overseas department of Mayotte is published in Plant Disease. The fungus that causes Fusarium wilt was isolated from two cultivars 'Baraboufaka' (Bluggoe subgroup ) and 'Kissoukari' (Silk subgroup). The plants sampled were from two adjacent plots in Poroani, a village in the southwestern part of the Grande-Terre island. The symptoms were first observed in September 2019. It was the first time that the first incursion TR4 in a country was detected on a cultivar other than a Cavendish one.

Three additional positive cases have since been found in the localities of Koungou  and Bouéni, including a Cavendish cultivar known locally as 'Kontriké'.

The NPPO of France informed the Secretariat of the European and Mediterranean Plant Protection Organization in January 2020.  Mayotte is part of the Comoros archipelago, located off the coast of Mozambique, which also has TR4.