Monocerin is a fungal metabolite that has been found inF. larvarumand has diverse biological activities.1,2,3It is active against the bacteriaE. coliandB. megaterium, the phytopathogenic fungusM. violaceum, and the algaC. fuscain an agar diffusion assay when used at a concentration of 50 μg/disc.1Monocerin (17.5 μg/ml) induces mortality in adultC. erythrocephala.2It reduces root elongation in pre-germinatedS. halepenseseeds when used at a concentration of 33 ppm.3