Ambrosia beetles (especially Xyleborus and Hypocryphalus species) are attracted to diseased plants (such as Theobroma, Mangifera and Eucalyptus) and produce large amounts of fine wood shavings (frass) when creating breeding galleries in the trunk and branches (Goitia and Rosales, 2001). These wood shavings and faecal material are pushed outside the tree as the galleries are excavated, and the frass contains spores and fragments of mycelium that may be blown in the wind (Iton, 1960).