Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

First report of three Lasiodiplodia species (L. theobromae, L. pseudotheobromae, and L. caatinguensis) causing cashew gummosis in Guinea-Bissau (West Africa).

Abstract

Since 2013, there have been reports of gummosis on cashew (Anacardium occidentale) in Guinea-Bissau; however, identification of the causal agent remains to be addressed. During harvest season in May 2018, cashew trunks with dark cankers, cracks, and resin-like gum were observed in orchards located in Bolama Island of Bijagós archipelago and in the continental Tombali region of Guinea-Bissau. The causal pathogens were isolated and identified as Lasiodiplodia theobromae, L. pseudotheobromae and L. caatinguensis based on morphological characteristics, molecular data (sequence analysis of ITS rDNA, translation elongation factor 1-a (TEF1- a) and ß-tubulin (ß-tub) genes and phylogenetics), and pathogenicity tests. This is thought to be the first report of L. theobromae, L. pseudotheobromae, and L. caatinguensis causing cashew gummosis in Guinea-Bissau.