Aspyrone is a polyketide fungal metabolite that has been found inAspergillusand has diverse biological activities.1,2It is active against a panel of 13 fungi when used at a concentration of 20 μg/ml and a panel of 21 bacteria in a disc assay when used at a concentration of 100 μg per disc.1Aspyrone (10-1,000 mg/L) is nematocidal againstP. penetrans.2