Potato-dextrose agar (PDA), nutrient agar (NA), and oatmeal-tomato agar (OTA) were prepared according to the methods described by Dhingra and Sinclair (1995, pp. 345–394). A PDA medium was used to isolate numerous fungi, an NA medium was used to isolate bacteria, and an OTA medium was used to isolate Pythium and Phytophthora fungi. Armstrong Fusarium medium was prepared according to the method of Booth (1971, p. 23). This medium was also used for Fusarium sporulation in suspension.