An illustrated hypothetical model for WBD. Model correlating classical symptoms of green and dry broom in the field (A, C and E), M. perniciosa development inside cacao (B: biotrophic stage, D: transition from biotrophic to saprotrophic stage, F: saprotrophic stage) and molecular and cellular events displayed by the fungus in each developmental stages, based on genes annotated in genome survey (right side of the panel). Notice in B (right side) the presence of biotrophic mycelia in the apoplast surrounded by intact living cells. Also notice in C the presence of biotrophic mycelia (arrowhead) and saprotrophic mycelia (double arrowhead) inside a necrotic region. Micrographs scales: B left side: 15 μM; B right side: 25 μM; D: 50 μM; F: 50 μM.