Fungal cultures were isolated from freshly harvested Corylus avellana "Barcelona" nuts from Aurora, Oregon, USA. A 1 week-old sporulating culture on PDA was rinsed with 20 mL of sterile water containing 1 drop of Tween-20. Two mL of the spore solution with an absorbance of about 0.8 at 600 nm was added to each of 6 liters of potato dextrose broth (PDB, DIFCO). Broth cultures were shaken at 20 &#8451 and 100 rpm for 2 weeks. On Day 14, when the amount of reducing sugars in the cultures was no longer detectable using glucose test strips, 100 µL of methyl jasmonate and 0.172 g/L filter-sterilized phenylalanine were added to each flask, and shaking was resumed. The cultures were harvested on day 24.