cV8 plates were used for P. infestans and P. sojae instead of PDA because of slow growth in the PDA media. Two layers of sterile Whatman filter paper discs with a 0.6 cm diameter that contained either Trichoderma EtOAc extracts (100 μg/10 μL) as treatment, acetone–water (1:9, v/v) as a negative control, or propamocarb Pestanal® (1 μg/10 μL; Sigma, St. Louis, MO, USA) as a positive control were placed on top of the Phytophthora plug. The plates were then incubated at 18–30 °C for 5–13 days until Phytophthora growth in the negative control plates reached the edge of the plates, during which time the colony diameter was measured daily.